The maximum amount of HF that can be formed is 0.312 mol. The formula for the limiting reagent is SiF4. The amount of excess H2O that was consumed is: n(H2O excess consumed) = 0.
What is limiting reagent?Limiting reagent is the reactant that is completely used up in reaction and hence determines when the reaction stops.
SiF4(s) + 2 H2O(l) → 4 HF(aq) + SiO2(s)
Molar masses of SiF4 and H2O are:
SiF4: 28.09 + 4 x 19.00 = 104.09 g/mol
H2O: 2 x 1.01 + 16.00 = 18.02 g/mol
Number of moles of each reactant is:
n(SiF4) = 8.10 g / 104.09 g/mol = 0.0779 mol
n(H2O) = 5.90 g / 18.02 g/mol = 0.327 mol
For SiF4: n(HF) = 0.0779 mol SiF4 × (4 mol HF / 1 mol SiF4) = 0.312 mol HF
For H2O: n(HF) = 0.327 mol H2O × (4 mol HF / 2 mol H2O) = 0.654 mol HF
We see that H2O produces a larger amount of HF than SiF4, indicating that SiF4 is limiting reagent. Therefore, the maximum amount of HF that can be formed is 0.312 mol.
The formula for the limiting reagent is SiF4.
From the balanced equation, we see that 1 mol of SiF4 reacts with 2 mol of H2O to produce 4 mol of HF. Therefore, the amount of H2O required to react with 0.0779 mol of SiF4 is:
n(H2O) = 0.0779 mol SiF4 × (2 mol H2O / 1 mol SiF4) = 0.1558 mol H2O
The amount of excess H2O that was consumed is: n(H2O excess consumed) = 0.
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What is the final pH if you have 700 ml of sodium acetate buffer (50 mM, ph of 5.0) and you add 10 ml of 1 M NaOH?
Answer: 5.85
Explanation:
Calculate ratio of conjugate base to acid at pH 5; determine amounts of acetate and acetic acid in a 50 mM buffer; adjust change of moles when adding NaOH and then recalculate
Calcium carbonate decomposes at high temperatures to form carbon dioxide and calcium oxide.
CaCO3 --> CO2 + CaO (YOU MUST BALANCE FIRST)
Determine how many grams of calcium carbonate I will need to form 3.45L of carbon dioxide? Assume the pressure is 1atm and the temperature is 273K.
______ g CaCO3 (3 sig figs)
50 points
Given the volume of carbon dioxide is 3.45 L at a pressure of 1 atm and 273 K. Then, the number of moles of CO₂ is 0.154 moles. 0.154 moles of carbon dioxide gives 0.154 moles or 15.4 grams of calcium carbonate.
What is calcium carbonate ?Calcium carbonate is an ionic compound formed passing carbon dioxide gas through calcium oxide. As per the balanced reaction one mole of carbon dioxide and one mole of calcium oxide gives one mole of calcium carbonate.
Given, P = 1atm
v = 3.45 L for CO₂
T= 273 K
then use ideal gas equation to find the number of moles:
n = PV/RT
= 1 atm × 3.45 L/( 0.082 L atm/ K mol × 273 K) = 0.154 moles.
0.154 moles of CO₂ gives 0.154 moles of CaCO₃.
molar mass of CaCO₃ = 100 g/mol.
mass of 0.154 moles = 100 × 0.154 = 15.4 g.
Therefore, the mass of CaCO₃ formed will be 15.4 g.
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A chemical supply company ships a certain solvent in 1010-gallon drums. Let X� represent the number of drums, ordered by a randomly chosen customer. Assume X� has the following probability mass function:x01234p(x)0.40.20.20.10.1�01234�(�)0.40.20.20.10.1(a) Find the mean number of drums ordered.(b) Find the variance of the number of drums ordered.(c) Find the standard deviation of the number of drums ordered.(d) Let Y� be the number of gallons ordered. Find the probability mass function of Y�.(e) Find the mean number of gallons ordered.
a) The mean number of drums ordered is 1.4.
b) The variance in the number of drums ordered is 0.84.
c) The standard deviation of the number of drums ordered is 0.917.
d) The probability mass function of Y is the same as the probability mass function of X.
e) The mean number of gallons ordered is 14.
(a) The mean (or expected value) of X can be found by multiplying each value of X by its probability and adding the results. So:
E(X) = (0)(0.4) + (1)(0.2) + (2)(0.2) + (3)(0.1) + (4)(0.1) = 1.4
Therefore, the mean number of drums ordered is 1.4.
(b) The variance of X can be found using the formula:
Var(X) = E(X²) - [E(X)]²
To find E(X²), we calculate:
E(X²) = (0²)(0.4) + (1²)(0.2) + (2²)(0.2) + (3²)(0.1) + (4²)(0.1) = 2.2
Then, we can find the variance:
Var(X) = 2.2 - (1.4)² = 0.84
Therefore, the variance of the number of drums ordered is 0.84.
(c) The standard deviation of X is the square root of the variance:
SD(X) = √(Var(X)) = √(0.84) = 0.917
Therefore, the standard deviation of the number of drums ordered is approximately 0.917.
(d) Let Y be the number of gallons ordered. Since each drum contains 10 gallons, we have Y = 10X. Therefore, the probability mass function of Y can be found by substituting Y/10 for X in the given probabilities:
y 0 10 20 30 40
p(y) 0.4 0.2 0.2 0.1 0.1
Therefore, the probability mass function of Y is the same as the probability mass function of X, except the values are multiplied by 10.
(e) To find the mean number of gallons ordered, we use the linearity of expectation:
E(Y) = E(10X) = 10E(X) = 10(1.4) = 14
Therefore, the mean number of gallons ordered is 14.
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The question is -
A chemical supply company ships a certain solvent in 10-gallon drums. Let X represent the number of drums, ordered by a randomly chosen customer. Assume X has the following probability mass function:
x 0 1 2 3 4
p(x) 0.4 0.2 0.2 0.1 0.1
(a) Find the mean number of drums ordered.
(b) Find the variance of the number of drums ordered.
(c) Find the standard deviation of the number of drums ordered.
(d) Let Y be the number of gallons ordered. Find the probability mass function of Y.
(e) Find the mean number of gallons ordered.
I need help with a chemistry assignment
On increasing the temperature and pressure of ideal gas volume increases. The ideal gas, sometimes known as the perfect gas.
What is ideal gas?The ideal gas, sometimes known as the perfect gas, is a gas that, in physical behavior, corresponds to a certain idealized connection among pressure, volume, as well as temperature known as the ideal, or general, gas law.
This law is a generalization that includes both Boyle's and Charles' laws as special instances, and it asserts that for a given amount of gas, the product of volume V plus pressure P is proportionate to absolute temperature T; that is, PV = kT, where k is a constant. On increasing the temperature and pressure of ideal gas volume increases.
Therefore, on increasing the temperature and pressure of ideal gas volume increases.
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How many bromine atoms are present in 30.1 g of CH2Br2
Answer:
There are approximately 1.43 x 10^23 bromine atoms in 30.1 g of CH2Br2.
Explanation:
Calculate the molar mass of CH2Br2:
M(CH2Br2) = M(C) + 2M(H) + 2M(Br)
M(CH2Br2) = 12.01 g/mol + 2(1.01 g/mol) + 2(79.90 g/mol)
M(CH2Br2) = 252.82 g/mol
Calculate the number of moles of CH2Br2:
n = m/M
n = 30.1 g / 252.82 g/mol
n = 0.119 mol
Determine the number of bromine atoms:
There are 2 bromine atoms in each molecule of CH2Br2, so we can use Avogadro's number to convert moles to atoms:
N = n * N_A * 2
N = 0.119 mol * 6.022 x 10^23 atoms/mol * 2
N = 1.43 x 10^23 bromine atoms
which of the following statement is not true?a. trans alkenes are more stable than cis with the same substitutesb. a higher data delta h for heat of hydrogenation means you have a less stable alkenec. alkene stability is influenced by the degree of substitutiond. cis and geminal alkenes are considered equal in terms of stability
The statement that is not true is "cis and geminal alkenes are considered equal in terms of stability."
Alkenes are organic compounds that contain a carbon-carbon double bond and are classified into two groups based on the orientation of their substituents: cis-alkenes and trans-alkenes. The stability of alkenes is influenced by various factors, including the degree of substitution and the heat of hydrogenation (ΔH).
Generally, trans-alkenes are considered more stable than cis-alkenes with the same substituents because the substituents are farther apart in the trans isomer. Meanwhile, a higher ΔH for the heat of hydrogenation means that the alkene is less stable, as it requires more energy to convert the double bond into a single bond.
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write a net ionic and molecualr equation for displacement reaction iron(ii) acetate potassium hydroxide
Net ionic and molecular equation for displacement reaction iron(ii) acetate potassium hydroxide molecular equation
[tex]HC_2H_3O_2 (aq) \:+KOH(aq)\:\rightarrow \:KC_2H_3O_2 (aq) \:+H_2O(l)[/tex] and the Net ionic equation
[tex]HC_2H_3O_2 (aq) \:+OH^-\((aq):\:\rightarrow \:C_2H_3O_2^-(aq)\:+H_2O(l)[/tex]
Chemical reactions known as displacement reactions occur when a more reactive element removes a less reactive element from a molecule. When two chemicals interact by transferring ions, a double displacement reaction occurs, creating two new molecules. In the twofold displacement process, positive ions trade places with negative ions. In water-soluble ionic compounds, numerous double displacement reactions take arise. Precipitation reactions are those in which an insoluble solid separates from the solution and forms.
molecular equation
[tex]HC_2H_3O_2 (aq) \:+KOH(aq)\:\rightarrow \:KC_2H_3O_2 (aq) \:+H_2O(l)[/tex]
ionic equation
[tex]HC_2H_3O_2 (aq) \:+K^+(aq)\:+OH^-\((aq):\:\rightarrow \:C_2H_3O_2^-(aq)\:+ K^+(aq)\:+H_2O(l)[/tex]
Net ionic equation
Here, we cancel the ions that appear on each side of the equation.
[tex]HC_2H_3O_2 (aq) \:+OH^-\((aq):\:\rightarrow \:C_2H_3O_2^-(aq)\:+H_2O(l)[/tex]
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HELP!!!! I’ll Mark you As BRAINLIST
The tank of my Chrysler Voyager van holds 20.0 gallons of gasoline. What is the volume of my
gas tank in liters? (Show calculations, report correct significant figures and units)
Answer:
75.7082 liters
Explanation:
I did 20 gallons to liters
and I got 75.7082 liters
Please mark it brainliest. Ik it's probably wrong.
without doing any calculations, predict the closest value for the average atomic mass of the element m, and the reason for your choice using the information given below:
Without doing any calculations, the closest value for the average atomic mass of the element m is (a) the highest percent abundance & (d) 13.4.
The weighted average mass of the atoms that make up a naturally occurring sample of an element is what's referred to as its average atomic mass, which is also frequently referred to as its atomic weight. Unified atomic mass units (u), where 1 u is equal to precisely one-twelfth the mass of a neutral atom of carbon-12, are the standard units used to express average masses.
Since the average atomic mass of the element is close to the element with the highest percent abundance, which is close to 13.4 after doing the calculations, we got 13.815, which is close to 13.4.
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Which of the following statements is true about Gamma/X-rays?
A. Gamma/X-rays are isotopes of Helium-4.
B. Gamma/X-rays have mass of 4 and charge of +2.
C. Gamma/X-rays have no mass and no charge.
D. Gamma/X-rays have the highest ionizing power.
Answer:
C. Gamma/X-rays have no mass and no charge.
Explanation:
Gamma/X-rays are a type of electromagnetic radiation with no mass and no charge. They differ from other forms of radiation, such as alpha and beta particles, which have mass and charge. Gamma/X-rays are high-energy photons that have the highest frequency and shortest wavelength in the electromagnetic spectrum. They have very high ionizing power, which means they can remove electrons from atoms and molecules as they pass through matter, leading to potentially harmful effects on living organisms.
Stoichiometry worksheet 3 multi step Problems
As per the balanced reaction, 2 moles of sodium nitrate reacts with one mole of calcium carbonate. Then , 20 g or 0.2 moles of calcium carbonate needed 0.4 moles of sodium nitrate which is equal to 2.4 × 10²³ formula units.
What is Avogadro number ?One mole of every element contains 6.02 × 10²³ number of atoms. This number is called Avogadro number. Then, one mole of every compounds contain Avogadro number of molecules or formula units.
Given in the reaction, 2 moles of sodium nitrate is required by 1 mole of calcium carbonate.
molar mass of calcium carbonate = 100 g/mol
no.of moles in 20 g = 20/100 = 0.2 moles.
Hence, 20 g or 0.2 moles of calcium carbonate need 0.4 moles of sodium nitrate.
one mole of sodium nitrate contains 6.02 × 10²³ formula units. The number of formula units in 0.4 moles = 0.4 × 6.02 × 10²³ =2.4 × 10²³.
Therefore, the reaction need 2.4 × 10²³ formula units of sodium nitrate.
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A positive point charge with charge
6.61C
is located at coordinate
(0,0)
and is in water. Calculate the y-component of the total electric field in
N/C
produced by this charge in water at coordinate
(1.01,−3.55)
. The coordinates are given in meters. Please enter a numerical answer below. Aocepted formate are numbert or "e" based scientific notation e
9,0,23,−2,106,5.23
e-8
Can be used to calculate the y-component of the electric field in N/C produced by a positive point charge at coordinate (0,0) in water. Therefore, the positive point charge in water at coordinate (1.01, -3.55) produces a total electric field in N/C with a y-component of -4.55 x 105 N/C.
An electrically charged object can produce an electromagnetic field that has an impact on other electrically charged objects nearby. Lines of force radiating from the charged object and interacting with other charged objects can be used to represent this field. As the charged object is moved further away, the electric field's strength weakens in direct proportion to the charge. A fundamental idea in physics, the electric field is utilised to explain how charged particles interact. It is measured in units of N/C and is a vector quantity (Newtons per Coulomb). Coulomb's law, which states that the force between two charged objects is proportional to the product of the electric field can be used to compute the electric field.
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write iupac names for the compounds below. aniline p-chloro if you use them, abbreviate ortho-, meta-
Aniline has an amine group attached to the phenyl ring. Hence, the IUPAC name: phenylamine
1 and 4 position of the benzene ring is substituted with chlorine atoms. Hence, the IUPAC name: 1, 4-dichlorobenzene
What is IUPAC ?
International chemistry and allied disciplines and technologies are represented by the International Union of Pure and Applied Chemistry (IUPAC). As a result, IUPAC nomenclature can be thought of as a system for naming organic compounds in accordance with predetermined guidelines. answer that is thorough and detailed.
What is compound ?
A compound combines one or more additional substances to form a new product. The combination of two substances or elements is equal to the mass ratio for making that product. It is attached firmly, and they have equal in all ways to form a combination. The elements both are bonded together. Each compound has its chemical structure; if it breaks, it can either split into two atoms or molecules or in a single. Different types of compounds are present. An intermetallic compound is made of an alloy of metallic ions. The ions form ionic compounds with the help of the electrostatic force.
Aniline has an amine group attached to the phenyl ring. Hence, the IUPAC name: phenylamine
1 and 4 position of the benzene ring is substituted with chlorine atoms. Hence, the IUPAC name: 1,4-dichlorobenzene
Therefore, IUPAC names for the compounds are mentioned above.
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assume that at rest a neuron is selectively permeable to k and that the rising phase of the action potential depends on the opening of non-selective ion channels.
The resting potential of a neuron is maintained by selective permeability to potassium ions, and the initiation of the action potential is triggered by the opening of non-selective ion channels, allowing for the influx of positively charged ions.
A neuron at rest is in a state of polarization, meaning that there is a difference in electrical charge between the inside and outside of the cell. This resting potential is maintained by the selective permeability of the cell membrane to potassium ions, allowing them to flow out of the cell and creating a negative charge inside the cell. When an action potential is triggered, non-selective ion channels open, allowing positively charged ions such as sodium to enter the cell.
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12. If a gas canister contains 1.45 L of fuel, and the fuel density is 0.710 g/cm³. What is the mass of the fuel contained in the gas canister? (1cm³= 1mL)
The density of the fuel within a gas canister is 0.029 cm³ if the canister holds 1.45 L of gasoline and the gasoline has a density of 0.710 g/cm³.
Why is density crucial?A place's density describes how many things there are there, which could include people, animals, plants, or other objects. To calculate density, multiply this quantity by the area's dimensions. The population density of a nation is determined by dividing the total population by the area, measured in square kilometers and miles.
According to the given information:Volume of canister = 1.45 L.
Convert it to cm³.
The conversion formula is : 1 L = 1000 cm³
So;
1.45 L = 1.45 L × (1000 cm³)/1 L
= 1450 cm³
Mass of the fuel = volume × density
= 1450 cm³ × 0.710 g/ cm³
= 1029.5 g
Convert g to kg:
1029.5 g × (1 kg/ 1000 g)
= 1.0295 kg.
= 1.03 kg (approximately)
Mass of drop of gasoline = 22 mg
= 22 mg ×(1 g/ 1000 mg)
= 0.022 g
Volume = mass/ density
= 0.022 g/ (0.754 g/cm³)
= 0.029 cm³
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identify the kind(s) of intermolecular forces that would occur between the solute and solvent in an acetic acid (which is polar and contains an oh group) solution.
Intermolecular forces that would occur between the solute and solvent in an acetic acid are Hydrogen bridges, dipole-dipole interactions and dispersion force.
As a polar organic acid with a hydroxile group incorporated into a carboxyle function group, acetic acid has the ability to generate hydrogen bonds. On the other hand, because it can be partially dissociated, a piece of the chain that is partially positive or partially negative might engage in dipole-dipole interactions with other molecules.
Last but not least, London dispersion forces, a weaker version of the dipole-dipole interactions, are present when the electrons in two nearby atoms hold positions that cause the atoms to temporarily form dipoles.
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2) design an experiment to determine the effect of changing the temperature (cold to freezing) of the catalase on the rate of reaction
To determine the effect of changing the temperature on the rate of reaction of catalase, the following experiment can be designed:
Prepare a solution of catalase by dissolving it in a buffer solution of a suitable pH.
Add hydrogen peroxide to the catalase solution to initiate the reaction.
Record the initial rate of reaction by measuring the amount of oxygen produced over a set time interval (for example, every 30 seconds).
Repeat the reaction at different temperatures, starting at room temperature and gradually reducing it to below freezing.
At each temperature, repeat step 3 and measure the rate of reaction.
Plot the results to determine the effect of temperature on the rate of reaction.
By changing the temperature from cold to freezing, the rate of reaction of catalase will be affected due to the change in the activation energy of the reaction. The effect of temperature on the reaction rate can be determined by comparing the initial rate of reaction at each temperature. If the rate of reaction increases with increasing temperature, it can be concluded that the reaction is temperature dependent.
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The French chemist Antoine Lavoisier found that the weight of objects before burning and the weight of the products after burning were equal. He concluded that the total weight did not change during a process. Which of these best describes Lavoisier's conclusion?
1. From scientific law, Lavoisier created a scientific theory.
2. From experimentation, Lavoisier created a scientific law.
3. From observation, Lavoisier created a scientific theory.
Correct!
4. From observation, Lavoisier created a scientific law.
5. From observation, Lavoisier created a scientific conclusion.
The correct option is 4, From observation, Lavoisier created a scientific law these best describes Lavoisier's conclusion.
Lavoisier's scientific law, also known as the Law of Conservation of Mass, states that the total mass of a system remains constant throughout a chemical reaction. This means that the total mass of the reactants must equal the total mass of the products. Lavoisier's law was a groundbreaking discovery in the field of chemistry and helped lay the foundation for modern chemical reactions.
It was introduced by the French chemist Antoine Lavoisier in the late 1700s and has been widely accepted and used as a principle in chemical reactions ever since. This law is important in helping to explain the behavior of matter and energy in a chemical reaction, and it remains a fundamental principle in chemistry today.
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Based on valence bond theory, which statement best describes the electron geometry, bonding and hybridization of the central atom in carbon tetrachloride?
The electron geometry of carbon tetrachloride is tetrahedral, with 4 single bonds. The bonding and hybridization of the central atom is sp3, meaning that the electron orbitals used in the bonding are three hybridized orbitals composed of one s orbital and three p orbitals.
SP3 hybridization is a type of electron orbital hybridization that forms four sp3 orbitals, which are composed of one s orbital and three p orbitals. This hybridization is most commonly seen in molecules where the central atom is surrounded by four different atoms or groups of atoms. In carbon tetrachloride, the carbon atom is surrounded by four chlorine atoms, and each chlorine atom is single-bonded to the central carbon atom.
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Chemical action of shampoo and conditioner on hair
While shampoo opens the cuticles of the hair to remove dirt and impurities, conditioner seals them to keep moisture in. These two essential hair care products work together to give you healthy, strong, and moisturized hair.
What is the main purpose of shampoo?The shampoo's main purpose is to remove dirt and soil from your hair before conditioning it. This is typically accomplished by constructing the shampoo from two distinct types of ingredients. The first type are surfactants, which are used to clean the hair.
Hair conditioners typically contain cationic surfactants, which do not completely wash out because their hydrophilic ends bind to keratin. The surfactant molecules' hydrophobic ends then serve as the new hair surface.
Thus, A detergent molecule in shampoo acts as a surfactant, lowering the surface tension between water and sebum.
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For each pair of compounds listed, check the box next to the one with the higher boiling point. compounds higher boiling point Ne Ar CH, CH.CH CH, CH GeCl4 SnC14
The boiling point of a substance depends on the intermolecular forces of attraction between its molecules. Generally, the stronger the intermolecular forces, the higher the boiling point.
For each pair of compounds listed, the one with the higher boiling point is:
Ne (neon) and Ar (argon): Ar has a higher boiling point.CH₄ (methane) and CH₃CH₃ (ethylene): CH₃CH₃ has a higher boiling point.CH₃CH₃ (ethylene) and CH₂=CH₂ (ethene): CH₃CH₃ (ethylene) has a higher boiling point.GeCl₄ (germanium tetrachloride) and SnCl₄ (tin tetrachloride): SnCl₄ (tin tetrachloride) has a higher boiling point.Learn more about a compound boiling point here: https://brainly.com/question/14058698
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For this experiment, the melting point will be used for which of the following qualitative purposes? 00000 Select all that are True. To determine the eutectic melting point of the impure solid. To determine the purity of the recrystallized solid. To determine the amount of impurity that was present in the unknown solid. To determine the identity of the unknown solid.
The melting point of a solid can be used for the following qualitative purposes:
To determine the purity of the recrystallized solid.
To determine the identity of the unknown solid.
Impurities cause a substance's melting point to rise or fall, whereas a pure substance has a clearly defined melting point.
One can determine whether a sample is pure or impure by comparing the melting point of the sample to the known melting point of a pure substance.
A solid's melting point can be used to identify it. It is frequently possible to identify an unknown solid by comparing its melting point to the melting points of various reference materials.
How the melting point of a solid can be used to assess its purity?
Melting points can be used to determine whether a substance is pure or impure because an impure substance is a particular kind of mixture. Impure materials typically have a wider melting temperature range and a slightly lower melting point than pure materials.
What is the importance to identify the melting point of the recrystallized compound?
The melting point must be established. It can be used to identify a known compound first. Second, it may aid in the later definition of an unidentified compound. Third, it can be used to assess a substance's purity.
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Describe the difference between a subscript number in a molecule such as H₂O versus a coefficient
number in a chemical reaction such as: 2H₂O.
A subscript number in a molecule and a coefficient number in a chemical reaction are distinct from one another.
What are molecules?A collection of atoms that have chemically joined forces to create a unique chemical species is known as a molecule. The size of a molecule can vary from a small, diatomic species like oxygen (O2) to a large, complex structure like a protein. A molecule can also contain one or more types of atoms.
While a coefficient number in a chemical process, like 2H2O, denotes the number of molecules of a substance involved in the reaction, a subscript number in a molecule, like H2O, shows the number of atoms of a certain element in the molecule.
The coefficient number describes the amount of the material involved in a reaction, whereas the subscript number refers to the molecule's composition. For instance, the subscript 2 in the molecule H2O denotes that the molecule contains two hydrogen atoms and one oxygen atom. A coefficient of 1 would suggest that only one molecule of H2O is interacting in the reaction 2H2O, whereas a coefficient of 2 indicates that there are two molecules of H2O responding.
The stoichiometry of the reaction, which characterises the relative quantities of the reactants and products, is determined by the coefficient number.
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how many grams are in 6.95X10^24 molecules of SF6?
One moles of SF₆ contains 6.02 × 10²³ molecules and it weighs 146 g. The number of moles of 6.95 × 10²⁴ SF₆ molecules is 11.54. he mass of 11.54 moles is 1686 g.
What is one mole ?One mole of a substance is its amount containing 6.02 × 10²³ atoms or molecules. This number is called Avogadro number. One mole of every elements contains Avogadro number of atoms.
Similarly one mole of every compound contains 6.02 × 10²³ molecules. The mass of one mole of compound is called its molar mass.
Molar mass of SF₆ = 146 g/mol
No.of atoms in 146 g or one mole of SF₆ = 6.02 × 10²³
Then, number of moles of 6.95 × 10²⁴ SF₆ molecules
= 6.95 × 10²⁴/6.02 × 10²³ = 11.54 moles.
Mass of 11.54 moles = 11.54 × 146 =1686 g.
Therefore, 6.95 × 10²⁴ SF₆ molecules weighs 1686 g.
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Write the empirical formula of at least four binary ionic compounds that could be formed from the following ions: Fe+2,Cr+4,I−,S−2
The empirical formula of at least four binary ionic compounds that could be formed is FeI₂, FeS, CrI₄, CrS₂.
We must figure out the proportions of each element in the compound in order to derive the empirical formula for the given compound. A formula known as an empirical formula is one that only specifies the relative amounts of the constituent elements in a given compound, not their precise numbers or arrangements.
Cations and anions can be added to the reaction to start it. The two distinct components constantly combine to create binary compounds. The ionic compounds that may be created from the provided ions have the following empirical formula:
One Iron ion Fe²⁺ paired up with two other iodine ions I²⁻ to form a binary molecule of FeI₂One Iron ion Fe²⁺ paired up with one sulphur ions S²⁻ to form a binary molecule of FeS.One Iron ion Cr⁴⁺ paired up with four other iodine ions I²⁻ to form a binary molecule of CrI₄When 1 ion of Cr⁴⁺ combines with 2 ions of sulphur, S²⁻ , the binary compound formed is CrS₂.Learn more about ionic compound at https://brainly.com/question/24154535
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which state of matter holds its own shape
Answer:
Solids
Explanation:
hope that helps!
Compute the atomic packing factor for the diamond cubic crystal structure (shown in the figure below). Assume that bonding atoms touch one another, that the angle between adjacent bonds is 109.5o, and that each atom internal to the unit cell is positioned a/4 of the distance away from the two nearest cell faces (a is the unit cell edge length).
The atomic packing factor for the diamond cubic crystal structure is 34% and it is a loosely packed structure.
Number of atoms contributed by the corner atoms to an unit cell is 1/8×8 =1 and number of atoms contributed by the face centred atoms to the unit cell is 1/2 × 6 = 3 and atoms inside the structure=4 ,so total number of atoms present in a diamond cubic unit cell is 1 + 3 + 4 = 8, Since each carbon atom is surrounded by four more carbon atoms, the co-ordination number is 4.
From triangle WXY
XY^2=(a/4)^2+(a/4)^2
=(a^2)/8
From triangle XYZ
XZ^2=(a^2)/8 + (a/4)^2
=(3a^2)/16
But XZ=2r
So (2r)^2 = (3a^2)/16
Atomic radius r =( a(3)^1/2)/8
Atomic packing factor is = v/V
=[(8*4*PI*r^3)/3]/[(a)^3]
By putting value of r we get-----
APF=0.34 =34%
Thus it is a loosely packed structure.
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Discuss the main characteristic features of the transition elements with special reference to their atomic size, variable oxidation states, magnetic and catalytic properties.
Most of the transition elements show paramagnetic behavior. The unpaired electrons in d orbitals are responsible for the magnetic properties.
What transition elements explain their magnetic and catalytic properties?The paramagnetic nature of the transition metals increases on moving from left to right as the number of unmatched electrons increases from one to five. An interesting usual of transition metals is their ability to form magnets. Metal complexes that have unmatched electrons are magnetic.
Transition elements (also known as transition metals) are elements that have relatively filled d orbitals. IUPAC defines transition elements as an element having a d subshell that is moderately filled with electrons, or an element that has the ability to form stable cations with an faultily filled d orbital.
So we can conclude that Transition elements with paired electrons are diamagnetic, meaning they are interested to magnetic fields in the opposite direction.
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Write the complete nuclear reaction describing the initial alpha decay of Ts-293. Include all reactants and products separated by a reaction arrow, and include all isotopes and particles. Balance the reaction with coefficients if necessary. Include the correct superscripts and subscripts on each isotope and particle. For example, an electron would be written
∫ −1
e
The initial alpha decay of Ts-293 (Tennessine) can be described by the following nuclear reaction:
Ts-293 → Rg-289 + He-4
In this reaction, Ts-293 (Tennessine) decays into Rg-289 (Roentgenium) and a helium-4 nucleus (alpha particle). The subscripts indicate the atomic number of each isotope and the superscripts indicate the atomic mass. The reaction is balanced, with one atom of Ts- 293 decaying into one atom of Rg-289 and one alpha particle (He-4).
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A gas has a pressure of 1.43 atm and occupies
a volume of 7.7 L. If the gas is compressed to
a volume of 1.64 L, what will its pressure be,
assuming constant temperature?
The gas pressure after compression will be 6.76 atm.
What is gas pressure?The ideal gas law, one that states , PV = nRT, where P seems to be the pressure, V is the volume, n represents the number of moles of gas, R is the ideal gas constant, and T is the temperature in kelvin, can be used to calculate the pressure of a gas.Assuming that number of moles of gas as well as the temperature remain constant during compression, the gas pressure after compression can be calculated as follows:
Given
Pressure = 1.43 atm
Volume = 7.7 L
Volume after compression = 1.64 L
V2 = (nRT) / 1.64 L P2 = (nRT)
P2 denotes the pressure after compression, and V2 denotes the volume after compression. To find P2, we must enter the following values into the equation:
6.76 atm = (1.43 atm x 7.7 L) / 1.64 L
As a result, the gas pressure after compression will be 6.76 atm.
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