1x+cb=23
thios is right because math
Why did the French set up trading posts in North America?
Answer: Their main aim was to provide goods, specifically furs and sugar exportation.
Explanation:
What is the mass in grams of 0.375 mol of the element potassium, K?
Answer:
Mass = 14.7 g
Explanation:
Given data:
Mass in g =?
Moles of K = 0.375 mol
Solution:
The Molar mass of potassium is 39.1 g/mol.
Formula
Number of moles = mass/molar mass
Mass = Number of moles × molar mass
Mass = 0.375 mol × 39.1 g/mol
Mass = 14.7 g
14.7 g K
General Formulas and Concepts:Math
Pre-Algebra
Order of Operations: BPEMDAS
Brackets Parenthesis Exponents Multiplication Division Addition Subtraction Left to RightChemistry
Atomic Structure
Reading a Periodic TableUsing Dimensional AnalysisExplanation:Step 1: Define
0.375 mol K
Step 2: Identify Conversions
Molar Mass of K - 39.10 g/mol
Step 3: Convert
Set up: [tex]\displaystyle 0.375 \ mol \ K(\frac{39.10 \ g \ K}{1 \ mol \ K})[/tex]Multiply: [tex]\displaystyle 14.6625 \ g \ K[/tex]Step 4: Check
Follow sig fig rules and round. We are given 3 sig figs.
14.6625 g K ≈ 14.7 g K
what makes science reliable
Answer:
Science is really reliable because there is research and math and brains. Actual science are results from experiments, so it's mainly always correct.
Explanation:
Sulfur dioxide and oxygen react to form sulfur trioxide, like this: (g) (g) (g) Also, a chemist finds that at a certain temperature the equilibrium mixture of sulfur dioxide, oxygen, and sulfur trioxide has the following composition: compound pressure at equilibrium Calculate the value of the equilibrium constant for this reaction. Round your answer to significant digits.
Answer:
[tex]Kp=9.2x10^{-3}[/tex]
Explanation:
Hello!
In this case, for the undergoing chemical reaction at equilibrium:
[tex]2SO_2(g)+O_2(g)\rightleftharpoons 2SO_3(g)[/tex]
Which means that pressure-based equilibrium constant is computed via the following equilibrium expression:
[tex]Kp=\frac{p_{SO_3}^2}{p_{SO_2}^2p_{O_2}}[/tex]
Thus, by plugging in the given pressures at equilibrium, the required Kp turns out:
[tex]Kp=\frac{55.0^2}{70.2^2*66.7}\\\\Kp=9.2x10^{-3}[/tex]
Best regards!
Calculate the moles of ammonia present in a 1.284 g sample if the molar mass of ammonia is 17.030 g/mol.
Answer:
The moles of ammonia present in a 1.284 g sample are 0.075.
Explanation:
Molar mass is the mass of one mole of a substance, which can be an element or a compound. If the molar mass of ammonia is 17,030 g / mol, then in 1 mole of ammonia there are 17,030 g.
So, in this case, the following rule of three can be applied: if by definition of molar mass in there are 17.030 g in 1 mole of ammonia, 1.284 g of ammonia in how many moles will it be?
[tex]moles=\frac{1.284 g*1 mole}{17.030 g}[/tex]
moles=0.075
The moles of ammonia present in a 1.284 g sample are 0.075.
A solution is made by dissolving 17.2 g of ethanol, CH3CH2OH, in enough water to make exactly 500 mL of solution. What is the concentration (molarity) of CH3CH2OH in mol/L
Answer:
0.748M
Explanation:
Molarity is defined as the ratio between moles of solute (The substance in the lower amount, ethanol) and liters of solution.
To solve the problem we need to convert the mass of ethanol to moles using its molar mass and the mL of solution to liters:
Moles ethanol:
molar mass:
C₂H₆O:
2C = 2*12g/mol = 24g/mol
6H = 6*1g/mol = 6g/mol
O = 16g/mol
Molar mass: 24 + 6 + 16 = 46g/mol
Moles are:
17.2g * (1mol / 46g) = 0.374 moles
Volume of solution:
500mL * (1L / 1000mL) = 0.500L
Molarity:
0.374moles / 0.500L =
0.748MA chemist adds of a aluminum chloride solution to a reaction flask. Calculate the millimoles of aluminum chloride the chemist has added to the flask. Round your answer to significant digits.
The given question is incomplete. The complete question is:
A chemist adds 245.0 ml 0.0238 M of a aluminum chloride solution to a reaction flask. Calculate the millimoles of aluminum chloride the chemist has added to the flask. Round your answer to two significant digits.
Answer: The millimoles of aluminum chloride are 5.8
Explanation:
Molarity of a solution is defined as the number of moles of solute dissolved per liter of the solution.
[tex]Molarity=\frac{n}{V_s}[/tex]
where,
n = milli moles of solute
[tex]V_s[/tex] = volume of solution in ml
Now put all the given values in the formula of molarity, we get
[tex]0.0238=\frac{n}{245.0}[/tex]
[tex]n=5.8[/tex]
Therefore, the millimoles of aluminum chloride are 5.8
You have a solid 7.00 gram mixture of sodium nitrate and silver nitrate. You add distilled water to dissolve the solids. Now you have aqueous solutions of sodium nitrate and silver nitrate. Next you add excess sodium chloride which results in a precipitate forming. You collect and dry the precipitate that forms and it has a mass of 2.54 grams. Write a balanced net ionic equation for the reaction that occurred. Determine the percent silver nitrate in the original mixture by mass assuming 95.9% actual yield.
Answer:
Net ionic equation: Ag⁺(aq) + Cl⁻(aq) → AgCl(s)
44.9% as AgNO₃
Explanation:
When sodium nitrate, NaNO₃ and silver nitrate, AgNO₃ are dissolved in water, the Na⁺, NO₃⁻ and Ag⁺ ions are formed.
Then, the addition of NaCl (Na⁺ and Cl⁻) produce AgCl⁻ as precipitate. The net ionic equation is:
Ag⁺(aq) + Cl⁻(aq) → AgCl(s)If 2.54g of AgCl are formed and represents the 95.9% of yield. The real amount of AgCl is:
2.54g AgCl * (100% / 95.9%) = 2.65g AgCl.
In moles (Molar mass AgCl = 143.32g/mol):
2.65g AgCl * (1mol / 143.32g) = 0.0185 moles of AgCl = Moles of AgNO₃
Because all Ag comes from AgNO₃
Thus, the original mass of silver nitrate and its precentage is (Molar mass AgNO₃ = 169.87g/mol):
0.0185 moles AgNO₃ * (169.87g / mol) = 3.14g of AgNO₃
Percentage:
3.14g AgNO₃ / 7.00g * 100 =
44.9% as AgNO₃g A student found an unlabelled bottle on a shelf in the lab. In an effort to determine the identity of the liquid in the bottle, the student determined the mass of 30.05 mL to be 36.185 grams. What is the density of the unknown liquid
Answer:
1.204 g/mL
Explanation:
Step 1: Given data
Mass of the unknown liquid (m): 36.185 g
Volume of the unknown liquid (V): 30.05 mL
Step 2: Calculate the density of the unknown liquid
The density is an intrinsic property, which can help to identify an unknown substance. It is equal to the mass divided by the volume.
ρ = m / V
ρ = 36.185 g / 30.05 mL
ρ = 1.204 g/mL
Which of the following Group 17 elements is the least reactive?
The given question is incomplete. The complete question is :
Which of the following Group 17 elements is the least reactive
a) Flourine
b) Chlorine
c) Astatine
d) Iodine
Answer: c) Astatine
Explanation:
Halogen is the name given to Group 17 family with general electronic configuration of [tex]ns^2np^5[/tex] which have 7 valence electrons and thus easily gain one electron to attain stable configuration.
As we move down the group from flourine to chlorine to bromine to iodine to astatine , the valence shell moves farther from nucleus and thus tendency to accept the electron decreases and thus reactivity also decreases.
Thus Astatine is the least reactive of all.
researcher measures the mass of a sample to be 5.51 g. The actual mass of the sample is known to be 5.80g. Calculate the percent error.
Answer:
5% is the percent error
Explanation:
Percent error is defined as the 100 times the ratio of absolute value of the difference between the measurement and the theoretical value and the theoretical value, that is:
[tex]\frac{|Theoretical-Measurement|}{Theoretical} * 100[/tex]
In the problem, theoretical value is 5.80g and the measurement is 5.51g:
[tex]\frac{|5.80g-5.51g|}{5.80g} * 100[/tex]
% =
5% is the percent errorA pure Silicon crystal has 700,000 free electrons (actual number of electrons; not the concentration). How many holes does it have
Answer:
700,000 holes
Explanation:
When heat energy occurs to produce free electrons, the number of free electrons produced is directly proportional and equal to the number of holes it produces at that time.
Hence, if silicon crystal (pure) has 700,000 free electrons, then the number of holes it have is also 700,000.
PLEASE ANSWER ITS A BIT URGENT!!
A mid-ocean ridge is located at the boundary of two tectonic plates. Which diagram correctly models the relative plate motion on each side of a mid-ocean ridge? Answer choices -1st choice-2nd choice-3rd choice-4th choice-
Answer:the answer is B , the transform boundary
Explanation:
Calculate the volume in liters of a 2.3*10^-6 mercury(I) chloride solution that contains of mercury(I) chloride . Round your answer to significant digits.
Answer:
2.00x10⁵L
Explanation:
...That contains 125g of mercury(I) chloride...
The molarity, M, of a solution represents the moles of solute (Mercury(I) chloride), per liter of solution.
To solve this question, we need to determine the moles of mercury(I) chloride present in 125g. Then, with molarity, we can find the volume of the solution:
Moles Mercury(I) chloride -Molar mass: 271.52g/mol-:
125g * (1mol / 271.52g) = 0.460 moles
Volume:
0.460 moles * (1L / 2.3x10⁻⁶mol) =
2.00x10⁵LThe reaction described in Part A required 3.40 L of sodium chloride. What is the concentration of this sodium chloride solution
Answer:
Part A:
First, convert molarity to moles by multiplying by the volume:
0.293 M AgNO3 = (0.293 moles AgNO3)/1 L x 1.19 L = 0.349 moles AgNO3
0.32 L of HNO3 is titrated to equivalence using 0.12 L of 0.2 M NqOH. What is the concentration of the HNO3
Answer:
[tex]M_{acid}=0.075M[/tex]
Explanation:
Hello!
In this case, since the reaction between NaOH and HNO3 is:
[tex]NaOH+HNO_3\rightarrow NaNO_3+H_2O[/tex]
Whereas there is a 1:1 mole ratio between the acid and base, thus, we can write:
[tex]M_{acid}V_{acid}=M_{base}V_{base}[/tex]
In such a way, solving for the concentration of the acid, HNO3, we obtain:
[tex]M_{acid}=\frac{M_{base}V_{base}}{V_{acid}}[/tex]
Therefore, by plugging in we obtain:
[tex]M_{acid}=\frac{0.12L*0.2M}{0.32L}\\\\ M_{acid}=0.075M[/tex]
Best regards!
What relationship does Charles's law describe?
A. The relationship between temperature and volume
B. The relationship between moles and temperature
C. The relationship between pressure and volume
D. The relationship between volume and moles
SUBMIT
Answer: the relationship between temperature and volume
Explanation:
In an experiment, a student places a small piece of pure Mg(s) into a beaker containing 250.mL of 6.44MHCl(aq) . A reaction occurs, as represented by the equation above. (a) Write the balanced net ionic equation for the reaction between Mg(s) and HCl(aq) .
Answer:
Mg(s) + 2H^+(aq) ----> Mg^2+(aq) + H2(g)
Explanation:
We must first write the molecular equation, then obtain the complete ionic equation and subsequently get the net ionic equation as shown below;
Molecular reaction equation;
Mg(s) + 2HCl(aq) ------> MgCl2(aq) + H2(g)
Complete ionic equation;
Mg(s) + 2H^+(aq) + 2Cl^-(aq) ----> Mg^2+(aq) + 2Cl^-(aq) + H2(g)
Net ionic equation;
Mg(s) + 2H^+(aq) ----> Mg^2+(aq) + H2(g)
The Skin does all of these exept:
A. Protects Our Bones
B. Helps Keep our bodies at just the right temperature
C. Helps the body absorb sugary food
D. Allows us to have sense of Touch
Answer:
[tex]C. \: Helps \: the \: body \: absorb \: sugary \: food.[/tex]
convert 180 g/mol to mole/L
How many liters of 0.37 M solution can be made with 29.53 grams of lithium fluoride.
(LiF)?
Answer:
V = 3.1 L
Explanation:
Given data:
Molarity of solution = 0.37 M
Mass of LiF = 29.53 g
Volume of solution = ?
Solution:
Number of moles of LiF:
Number of moles = mass/molar mass
Number of moles = 29.53 g/ 25.94g/mol
Number of moles = 1.14 mol
Volume:
Molarity = number of moles of solute / Volume in L
0.37 M = 1.14 mol / V
V = 1.14 mol / 0.37 M
V = 3.1 L (M = mol/L)
The electronic arrangment is the same as the molecular shape when 1. there are more shared electrons than nonshared electrons. 2. the atoms are joined by sigma bonds. 3. the molecule is not polar. 4. there are no lone pairs of electrons on the central atom. 5. the number of bonding orbitals equals the number of anti-bonding orbitals.
Answer:
. there are no lone pairs of electrons on the central atom.
Explanation:
According to the Valence Shell Electron Pair Repulsion (VSEPR) thoery, the shape of a molecule is determined by the number of electron pairs present on the valence shell of the central atom in the molecule.
The number of electron pairs ultimately determines how they will be arranged in space. However, the presence of lone pairs on the central atom causes a greater repulsion of electron pairs and a consequent deviation of the molecular geometry from that predicted by the VSEPR theory. Hence the answer
Use the data table below. What are the two gases present in the test tube If the glowing splint ignites and the burning splint creates a small explosion? How do you know?
Answer:
hydrogen and oxygen
Explanation:
oxygen gas ignites a glowing splint because it supports burning while hydrogen gas extinguishes the burning splint with a pop sound.
the mixture of the two explodes thus the observation
What energy transformation occurs when a battery-powered toy car is set into motion when it is switched on?
Chemical to mechanical to electrical
Electrical to mechanical to chemical
Electrical to chemical to mechanical
Electrical to chemical to mechanical
Chemical to electrical to mechanical
Answer:
Chemical to electrical to mechanical
Explanation:
The energy conversion going on in a battery - powered toy car is from chemical to electrical and then to mechanical energy.
According to the law of conservation of energy, energy is neither created nor destroyed but transformed from one form to another.
A battery is a cell that is capable of producing electrical energy from chemical actions. This electrical energy is used to power rotors in the toy car which cause the mechanical motion of the device.someone pls help I’m not sure which one it is
Answer:
Space
Explanation:
Sound waves can't travel through space but radiant energy from the sun can, which is how it reaches Earth.
what is the periodic table elements
Answer:
Here is a picture of all the elements
Answer:
The periodic table is a tabular array of the chemical elements organized by atomic number, from the element with the lowest atomic number, hydrogen, to the element with the highest atomic number, oganesson. The atomic number of an element is the number of protons in the nucleus of an atom of that element.
Explanation:
PLEASE MARK ME AS BRAINLIEST
Explain why it is necessary for a chemical reaction to balance.
Draw the Lewis structure for the compound with the formula COCl2. Use lines to show bonding electrons. Draw the molecule by placing atoms on the canvas and connecting them with bonds. Include all lone pairs of electrons.
Answer:
Explanation:
The lewis structure illustrates the bonding occuring between atoms of a molecule in conjunction with the lone pairs of electrons which have the possibility of existence in the molecule.
The image attached below shows the Lewis structure for the given Carbonyl dichloride (COCl₂) compound. From the image, the chlorine contains seven valence electrons, the carbon contains four valence electrons and oxygen contains six valence electrons.
Decide which element probably has a boiling point most and least similar to the boiling point of indium
Answer:
Most similar- Al
Least similar- F
Explanation:
From our knowledge of the periodic table, it is already clear that elements in the same group in the periodic table share certain similarities in physical and chemical properties.
Since Indium and aluminium belong to the same group in the periodic table, they will share a similarity in their boiling points.
Florine is a non metal, it is expected to be least similar to indium in physical properties.
A certain ore contains 34% hematite, Fe2O3. Hematite is 69.9% iron. How much iron can be isolated from 250 tons of this ore
Answer:
59.4 tons of iron can be isolated from this ore
Explanation:
mass of ore = 250 tons
mass of hematite = 34 % of 250
= 85 tons
mass of iron = 69.9 % of hematite
= 69.9 % of 85
= 59.4 tons
So, 59.4 tons of iron can be isolated from this ore .