Answer:
69
Explanation:
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1.28 moles of aluminum bromide (AlBr₃) has a mass of 341.35 g.
We want to convert 1.28 moles of aluminum bromide (AlBr₃) to grams. We will need first to calculate its molar mass.
What is the molar mass?The molar mass is the sum of the total mass in grams of all the atoms that make up a mole of a particular molecule.
Step 1: Calculate the molar mass of aluminum bromide.M(AlBr₃) = M(Al) + 3 M(Br) = 26.98 g/mol + 3 × 79.90 g/mol =
= 266.68 g/mol
Step 2: Convert 1.28 moles to mass.1.28 mol × 266.68 g/mol = 341.35 g
1.28 moles of aluminum bromide (AlBr₃) has a mass of 341.35 g.
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which category of hurricanes cause the greatest damage
Answer:
The Saffir-Simpson Hurricane Wind Scale is a 1 to 5 rating based on a hurricane's sustained wind speed. This scale estimates potential property damage. Hurricanes reaching Category 3 and higher are considered major hurricanes because of their potential for significant loss of life and damage.
Explanation:
Please mark me as brilliant and thank you.
How many molecules of water are required for the polymerization of a 22 monomer-long cellulose molecule
Answer:
21 molecules of water.
Explanation:
The polymerization of a 22-monomer long cellulose molecule will require 21 molecules of water. This is because the polymer bond is formed when the -OH group from the 1st monomer of the glucose unit and the H group from the 2nd monomer gets removed as a water molecule. This process is termed to be a condensation reaction.
How many valence electrons does group 18 have
Answer:
group 18 has 8 valence electrons, that's why they are stable.
8!
Explanation:
You're looking at the very last column, right? Noble gases are known for their stability because their valence shells are full! Lucky for you, all you have to do to know the number of valence electrons is look at the column number and take ignore the 1! 16 becomes 6, 18 becomes 8.
Calculate the volume in milliliters of a 5.11/mol silver nitrate solution that contains 175.g of silver nitrate AgNO3. Round your answer to 3 significant digits.
Answer:
[tex]V=202mL[/tex]
Explanation:
Hello!
In this case, considering we have a 5.11-molar solution (5.11 M) that contains 175. g of silver nitrate, we first need to compute the moles of solute as its molar mass is 169.87 g/mol:
[tex]n=175g*\frac{1mol}{169.87 g} =1.03mol[/tex]
Next, since the definition of molarity is moles over volume:
[tex]M=\frac{n}{V}[/tex]
We solve for the volume and plug in the molarity and moles as shown below:
[tex]V=\frac{n}{M} =\frac{1.03mol}{5.11mol/L}\\\\V =0.202L[/tex]
However, as it is needed in milliliters, we convert the L to mL:
[tex]V=0.202L*\frac{1000mL}{1L}\\\\V=202mL[/tex]
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In the laboratory you are asked to make a 0.175 m barium sulfide solution using 15.4 grams of barium sulfide. How much water should you add
Answer:
0.5195 liters of water
Explanation:
First we convert 15.4 grams of barium sulfide (BaS) into moles, using its molar mass:
15.4 g ÷ 169.39 g/mol = 0.0909 molThen we calculate the required volume of water, using the definition of molarity:
molarity = moles / volume0.175 M = 0.0909 mol / VolumeVolume = 0.5195 LThe + symbol, on the products side, in a chemical equation means
Explanation:
Used to separate one reactant or product from another
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In a polar reaction mechanism, the atom that gives away electrons in a neutral nucleophile will end up as a(n):
The question is incomplete, the complete question is shown in the image attached.
Answer:
Cation
Explanation:
In a polar reaction mechanism, a specie must give out electrons and another specie must accept those electrons.
The specie that gives out electrons becomes electron deficient and positively charged so we refer to such a specie as a cation.
Hence, the specie that looses electrons becomes a cation.
Which branch of chemistry would be used by physicians when deciding
what kinds of medicines to prescribe?
Explanation:
Medicinal chemistry and pharmaceutical chemistry are disciplines at the intersection ofchemistry, especially synthetic organicchemistry, and pharmacology and various other biological specialties, where they are involved with design,chemical synthesis and development for market of pharmaceutical agents, or bio-active ...
4.How many atoms of silver are in 100 grams of silver?
Answer:
5.58x1023Agatoms 5.58 x 10 23 A g a t o m s
Explanation:
After determining the moles of the sample, we can convert it to the number of atoms using the Avogadro's number.
Which of the following is a covalent compound? *
CO2
OK20
O Naci
O MgCl2
Answer:
this question is badly formatted. CO2
Explanation:
the answer is CO2 because C and O are both anions/nonmetals. the other examples contain a cation/metal, so they're ionic compounds
Explain two benefits that the flea get from living on a dog.
Answer:
Benefits of the flea from living on a dog
Explanation:
They feed on the blood of the dog. They deliver about 4000 eggs on the hosts fur.
Determine whether or not each chemical formula is an empirical formula. C6H12O6 CaCO3 NaMnO4 Ba3(PO4)2 K2C2O4
Answer:
- C6H12O6 is not an empirical formula because it can be simplified to CH2O.
- CaCO3 is an empirical formula as well as molecular formula because it has been simplified up to the smallest subscript per atom.
- NaMnO4 is an empirical formula as well as molecular formula because it has been simplified up to the smallest subscript per atom.
- Ba3(PO4)2 is an empirical formula as well as molecular formula because it has been simplified up to the smallest subscript per atom.
- K2C2O4 is not an empirical formula because it can be simplified to KCO2.
Explanation:
Hello!
In this case, since the empirical formulas are referred to those formulas that have been simplified up to the smallest whole number for each subscript per atom, we can see that:
- C6H12O6 is not an empirical formula because it can be simplified to CH2O.
- CaCO3 is an empirical formula as well as molecular formula because it has been simplified up to the smallest subscript per atom.
- NaMnO4 is an empirical formula as well as molecular formula because it has been simplified up to the smallest subscript per atom.
- Ba3(PO4)2 is an empirical formula as well as molecular formula because it has been simplified up to the smallest subscript per atom.
- K2C2O4 is not an empirical formula because it can be simplified to KCO2.
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A 4kg bowling ball is held 2.5 meters above your head. A 0.5 kg tennis ball is held at 12 meters above your head. Which one has more potential energy
Answer:
P.E for the 4kg bowling ball held 2.5 meters above head is 100j, while the other is 60j so the 4kg ball has more potential energy
Which subatomic particle of an atom moves around nucleus
Answer:
B. Electrons
Explanation:
How many atoms of oxygen are contained in 160 grams of N203?
Answer:
i think it is 1.27 x1024
Explanation:
i don't really know though
Answer:
(160/28+48)=(160/76)*6.022x10²³
The core of the Earth provides the
heat that creates the convection
currents of the mantle and drives
the tectonic plates. Describe what
would happen as the Earth's core
cools down over billions of years?
Answer:
When the molten outer core cools and becomes solid, a very long time in the future, the Earth's magnetic field and atmosphere will disappear.
Matter are anything that is made up of atoms. The quantity of matter can be observed only on the basis of mass and volume calculation. Therefore, the magnetic field will vanish a very lot longer after the liquid outer core solidifies and cools.
What is matter?Matter is a substance that has some mass and can occupy some volume. The matter is mainly used in science. Matter can be solid, liquid or gas.
Matter is anything that is made up of atoms. Anything around us that can be physically seen and touched are matter. Ice, water and water vapors are example of matter.
So as we saw that matter has some mass so mass can be measured in gram only. Mass can also be represented as number of molecules. We also saw that matter occupy some volume and that volume is measured only in liter. The magnetic field or atmosphere will vanish a very lot longer after the liquid outer core solidifies and cools.
Therefore, the magnetic field or atmosphere will vanish a very lot longer after the liquid outer core solidifies and cools.
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Classify each solvent as protic or aprotic. a. (CH3)2CHOH c. CH2Cl2 e. N(CH3)3 b. CH3NO2 d. NH3 f. HCONH2
Answer:
The protic solvents are (CH3)2CHOH, NH3, and HCONH2
The aprotic solvent are CH3NO2, CH2Cl2, and N(CH3)3
Explanation:
A protic solvent is a solvent that has a hydrogen atom bound to an oxygen (O), a nitrogen (N), or fluoride (F). Generally, any solvent that contains a labile H⁺ is called a protic solvent.
a. (CH3)2CHOH
(CH3)2CHOH is a protic solvent because one of the hydrogens is bound to oxygen (O)
b. CH3NO2
CH3NO2 is an aprotic (i.e not a protic solvent) solvent because all the hydrogens are bound to carbon.
c. CH2Cl2
CH2Cl2 is an aprotic solvent because all the hydrogens are bound to carbon.
d. NH3 is a protic solvent because all the hydrogens are bound to Nitrogen (N)
e. N(CH3)3 is an aprotic solvent because all the hydrogens are bound to carbon
f. HCONH2 is a protic solvent because two of the hydrogens are bound to Nitrogen (N)
Compare What do infrared technologies, fiber optic
technologies, and satellite technologies all have in
common?
Answer:
ptic fiber communication and satellite communication are the leading technologies which are revolutionizing the world of telecommunications. Both technologies have their advantages and limitations which make them suitable for certain type of applications. This article will provide an overview of optic fiber and satellite communication technologies and present a comparison of the features and related issues.
Optic Fiber Communication
Optic Fiber communication transmits information by sending pulses of light (using laser) through an optic fiber. The low signal loss in optic fibers and high data rate of transmission systems, allow signals with high data rates (exceeding several Gbps) to travel over long distances (more than 100 km) without a need of repeater or amplifier. Moreover, using wavelength division multiplexing (WDM) allows a single fiber to carry multiple signals (upto 10 different signals) of multi-Gbps transmissions. Optic Fiber communication offers extremely high bandwidth, immunity to electromagnetic interference, non-existent delays and immunity from interception by external means. In the 1980s and 1990s, the continents were linked together using undersea optic fiber bringing about a paradigm shift in the global telecommunications.
These advancements in optic fiber communication has resulted in decrease of satellite communications for several types of communications. For instance, transmission between fixed locations or point-to-point communications, where large bandwidths are required (such as transoceanic telephone systems) are made through optic fiber instead of using satellite communication. Optic Fiber communication is also used to transmit telephone signals, Internet communication, LAN (Gigabit LAN) and cable television signals.
Satellite Communication
Satellite communications use artificial satellites as relays between a transmitter and a receiver at different locations on Earth. Satellite systems allow users to bypass typical carrier offices and to broadcast information to multiple locations. Communications satellites are used for radio, TV, telephone, Internet, military and other applications. There are more than 2,000 satellites around Earth’s orbit, being used for communication by both government and private organizations.
Communication Satellites are LOS (line-of-sight) microwave systems with a repeater. These satellites rotate around the earth with the speed of earth and are known as geostationary satellites. The limitations of antenna size also limits focusing capability making the coverage for a single satellite transmitter very large. This makes satellite communication ideal for TV and radio services as the signal has to flow from a single point to many points in a single direction. The large distance of satellites from the earth (about 22,300 miles) results in delays which adversely effects two-way communication like mobile conversations. Low earth orbit satellites can be used for two-way mobile communication because less power is required to reach those satellites.
Explanation:
What is the mass of two moles of the diatomic gas, N2
Answer:
[tex]m_{N_2}=56.04 gN_2[/tex]
Explanation:
Hello!
In this case, since nitrogen diatomic gas is a molecule that has the following molar mass:
[tex]M_{N_2}=14.01*2\\\\M_{N_2}=28.02g/mol[/tex]
Thus, since we have two moles of this molecule, we can compute the referred mass as shown below:
[tex]m_{N_2}=2molN_2*\frac{28.02gN_2}{1molN_2}\\\\m_{N_2}=56.04 gN_2[/tex]
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at a particular temperature, asample of pure water has a Kw of 1.7x10-12. what is the hydroxide concentration of this sample
Answer:
Hydroxide concentration of the sample is 1.3x10⁻⁶M
Explanation:
The equilibrium constant of water, Kw, is:
H₂O(l) ⇄ H⁺(aq) + OH⁻(aq)
Kw is defined as:
Kw = 1.7x10⁻¹² = [H⁺] [OH⁻]
As the sample is of pure water, both H⁺ and OH⁻ ions have the same concentration because come from the same equilibrium, that is:
[H⁺] = [OH⁻]
We can write the Kw expression:
1.7x10⁻¹² = [OH⁻] [OH⁻]
1.7x10⁻¹² = [OH⁻]²
1.3x10⁻⁶M = [OH⁻]
Hydroxide concentration of the sample is 1.3x10⁻⁶MWrite balanced chemical equations for the sequence of reactions that oxalic acid can undergo when it's dissolved in water.
Answer and Explanation:
The balanced chemical equations are as follows:
The chemical formula of oxalic is [tex]H_2C_2O_4[/tex]
In the case when oxalic acts reacted with the water so here the oxalic acid eliminates one proton that leads to the development of mono acids
After that, the second step derives that when oxalic acid is in aqueous solution eliminates other proton so it represent the polyprotic acid
Now the chemical equations are as follows:
Elimination of one proton
[tex]H_2C_2O_4(aq)+H_2O(l) \rightarrow H_2C_2O_4^-(aq) + H_3O^+(aq)[/tex]
Now the elimination of other proton
[tex]HC_2O_4^-(aq)+H_2O(l) \rightarrow C_2O_4^2^-(aq) + H_3O^+(aq)[/tex]
How many moles of lead, Pb, are in 1.50 x 10^12 atoms of lead?
2.49 × 10⁻¹² moles Pb
General Formulas and Concepts:Math
Pre-Algebra
Order of Operations: BPEMDAS
Brackets Parenthesis Exponents Multiplication Division Addition Subtraction Left to RightChemistry
Atomic Structure
Using Dimensional AnalysisAvogadro's Number - 6.022 × 10²³ atoms, molecules, formula units, etc.Explanation:Step 1: Define
1.50 × 10¹² atoms Pb
Step 2: Identify Conversions
Avogadro's Number
Step 3: Convert
Set up: [tex]\displaystyle 1.50 \cdot 10^{12} \ atoms \ Pb(\frac{1 \ mol \ Pb}{6.022 \cdot 10^{23} \ atoms \ Pb})[/tex]Multiply: [tex]\displaystyle 2.49087 \cdot 10^{-12} \ moles \ Pb[/tex]Step 4: Check
Follow sig fig rules and round. We are given 3 sig figs.
2.49087 × 10⁻¹² moles Pb ≈ 2.49 × 10⁻¹² moles Pb
What is the name of the compound Hg4SiO4?
Answer:
mercury (I) silicate
Explanation:
34 atoms of carbon (C) react with 22 molecules of hydrogen gas (H2). How many molecules of methane (CH4) will be formed, and what will be left over
Answer:
11 molecules of CH4.
23 atoms of C is the leftover.
Explanation:
Hello!
In this case, for the formation of methane:
[tex]C+2H_2\rightarrow CH_4[/tex]
We can see there is an excess of carbon based on their stoichiometry, because the needed amount of hydrogen gas molecules would be:
[tex]molecules _{H_2}=34atomC*\frac{2molec\ H_2}{1atomC} =68molec\ H_2[/tex]
Thus, the formed molecules of methane are computed below:
[tex]molec\ CH_4=22molec\ H_2 *\frac{1molec\ CH_4}{2molmolec\ H_2} \\\\molec\ CH_4=11molec\ CH_4[/tex]
In such a way, the leftover of carbon atoms are:
[tex]atoms \ C^{left over}=34-22molec\ H_2*\frac{1atoms C}{2molec\ H_2} \\\\atoms \ C^{left over}=23 atoms C[/tex]
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What type of succession takes place when a community starts to grow?
A. Primary
B. Secondary
Answer:
Primary
Explanation:
Succession is a series of progressive changes in the composition of an ecological community over time. In primary succession, newly exposed or newly formed rock is colonized by living things for the first time.
How can you tell the difference between a strong acid and a weak one?
A. Strong acids release 1 hydrogen, weak acids release 2 hydrogens.
B. Strong acids are diprotic and release 2 hydrogens, weak acids only release 1 hydrogen.
OC. Weak acids dissociate fully, strong acids only partially dissociate.
D. Strong acids dissociate fully, weak acids only partially dissociate.
Acids are hydrogen donating substances that are weak and strong. The weak acids partially dissociate while the strong completely dissociate in solution. Thus, option D is correct.
What are strong and weak acids?
Strong acids are the acids that get completely ionized and dissociated in a solution and hence have the maximum hydrogen or hydronium ions (protons) released in the solution.
The weak acids are the acids that partially dissociate into their ions in the solution, determine their strength, and produce less hydrogen or proton ions in the solution.
Acetic acid, formic acid, oxalic acid, benzoic acid, etc., are weak acids, whereas sulfuric acid, nitric acid, hydrochloric acid, chloric acid, etc., are strong acids.
Therefore, the dissociation differentiates the weak and strong acids.
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What type of reaction is shown here?
6Li + Ca3(PO4)2 → 2Li3PO4 + 3Ca
A gas made up of homonuclear diatomic molecules escapes through a pinhole 0.936 times as fast as N2 gas. Write the chemical formula of the gas.
Answer:
See explanation
Explanation:
Let the rate of diffusion of the unknown gas be x
Let the rate of diffusion of nitrogen be y
Let molecular mass of unknown gas be MX
Let molecular mass of nitrogen be My
Hence;
x/y = √My/MX
0.936/1 = √28/MX
(0.936/1)^2= 28/MX
MX= 28/0.876096
MX= 32 g/mol
MX is O2 gas
a change in matter in which the density of the inatter
stays the same
Answer: A physical property that will be the same regardless of the amount of matter. Extensive Properties: A physical property that will change if the amount of matter changes.
The isotope carbon-14 decays over time into nitrogen-14 with a half-life of 5,730 years. Suppose that you find a fossil that contains 1.25 grams of carbon-14 and 3.75 grams of nitrogen-14. How old is the fossil
Answer:
11460 years
Explanation:
0.693/t1/2 = 2.303/t log (No/N)
t1/2 = half life of the carbon
t = age of the fossil
No= amount of radioactive material originally present
N= amount of radioactive material present at time=t
No= mass of carbon + nitrogen = 5g
0.693/5730 = 2.303/t log (5/1.25)
1.21 ×10^-4 = 1.3866/t
t= 1.3866/1.21 ×10^-4
t= 11460 years