Dtermine the volume in liters occupied by 0.030 miles of a gas at stp
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0.030 moles --- ?
V = 0.030 * 22,4 / 1
V = 0.672 L
hope this helps!
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Suppose that you measure a pen to be 10.5 cm long. Convert this to meters.
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Answer:
Everything that has mass and takes up space is matter. Every day, you encounter phenomena that either don't have mass or don't take up space. They are non-matter. Basically, any type of energy or any abstract concept is an example of something that is not matter.
An apple.
A person.
A table.
Air.
Water.
A computer.
Paper.
Iron.
hope this helped you
B 16g/56g x 100%
C 40g/56g x 100%
D 40g/100% x 56g
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Answer:
C 40 g/56 g × 100 %
Explanation:
Calculate the mass of each component and the total mass.
Element Atomic mass/u No. of atoms Subtotal mass/u
Ca 40.08 1 40.08
O 16.00 1 16.00
Total = 56.08
The formula for mass percent is
% by mass = Mass of component/Total mass × 100 %
In this problem
% Ca = mass of Ca/mass of CaO × 100 %
% H = 40.08 g/56.08 g × 100 %
The percentage composition of calcium (Ca) in CaO is option C.
- Here we have to determine the mass of every component and even the total mass.
Element Atomic mass/u No. of atoms Subtotal mass/u
Ca 40.08 1 40.08
O 16.00 1 16.00
Total = 56.08
- The mass percent formula is
Therefore, we can conclude that the correct option is C.
Learn more: brainly.com/question/362440
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a. 0.712 M
b. 0.210 M
c. 0.336 M
Molarity is a measure of the concentration of solute in a solution.
It can be expressed as moles of solute ÷ volume of solution:
c = n ÷V
where:
c - concentration of solute,
n - moles of solute
V - volume of solution
n can be expressed as:
n = m ÷ Mr
where:
n - moles of solute
m - mass of solute
Mr - relative molecular mass
a. We know volume:
V = 289.2 mL = 0.2892 L
We need n and c.
n = m ÷ Mr
m = 15.4 g
Mr (KCl) = 74.55 g/mol
n = 15.4 g ÷ 74.55 g/mol
n = 0.206 mol
Thus,
c = 0.206 mol ÷ 0.2892 L
c = 0.712 mol/L = 0.712 M
b. We know volume:
V = 0.614 L
We need n and c.
n = m ÷ Mr
m = 14.4 g
Mr (CaCl₂) = 110.98 g/mol
n = 14.4 g ÷ 110.98 g/mol
n = 0.129 mol
Thus,
c = 0.129 mol ÷ 0.614 L
c = 0.210 mol/L = 0.210 M
c. We can use formula:
m₁V₁ = m₂V₂
m₁ = 3 M
V₁ = 28 mL= 0.028 L
m₂ = ?
V₂ = 0.250 L
Thus:
3 M × 0.028 L = m₂× 0.250 L
m₂ = 0.336 M
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q=the heat absorbed or released
n=the number of moles of the sample (in this case 2.78mol (50g/18g/mol))
ΔH(vap)=the heat of vaporization for the sample (in this case 40.7kJ/mol)
When you plug everything in you should find that 113.05kJ is needed to vaporize 50g of water. (the temperature does not change during a phase change since all of the heat absorbed is being used to break the intermolecular forces and none of it is being used to speed up the molecules).
I hope this helps. Let me know if anything is unclear.
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Explanation:
Atoms are considered as the basic unit of matter because atoms combine to form matter. Atoms combine to form elements and compounds which further make up the atom.
Atoms contain electron, proton and neutrons. Electrons are negatively charged particles. They do not combine to form matter. A stable atom is a combination of fixed number of electrons, protons and neutrons.