Copy of Mole Conversion Review and Volume of Gas at STP (Jan 2023) (5/28/2026)
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C.4.4 Apply the mole concept to determine the mass, moles, number of particles, or volume of a gas at STP, in any given sample, for an element or compound.
Learning Goals:
I can use the mole concept to determine the mass in any sample at STP.
I can use the mole concept to determine the moles in any sample at STP.
I can use the mole concept to determine the number of particles in any sample at STP.
I can use the mole concept to determine the volume of a gas in any sample at STP.
Examples:
I have provided a set of 10 examples of me working out problems similar to those that you are doing on this activity.
They are located below.
I encourage you to watch them whenever you need assistance.
Example A - moles to mass
Example B - mass to moles
Example C - moles to molecules (particle)
Example D - atoms (particle) to moles
Example E (2 step) - mass to atoms
mass to moles to atoms
Example F (2 Step) - molecules to mass
molecules to moles to mass
Example G - new material (Volume of a gas at STP)
moles to volume
Example H - volume to moles
Example I - (2 step) - mass to volume
mass to moles to volume
Example J - (2 step) - volume to atoms
volume to moles to atoms
How to report an answer in scientific notation on this assignment.
Question 1
1.
Calculate the mass of 8.4 moles iron (Fe).
Remember to round according to the rules of SigFigs.
_______
Question 2
2.
Convert 0.45 g NaOH into moles.
Remember to round according to the rules of SigFigs.
_______
Question 3
3.
Calculate the number of molecules in 3.4 moles of CO2.
Remember to round according to the rules of SigFigs.
Question 4
4.
Calculate the number of molecules in 168.2 g of CO2.
Remember to round according to the rules of SigFigs.
Question 5
5.
New material - volume of a gas at STP
Calculate the number of moles in a 75.8 L sample of neon (Ne) gas.
Remember to round according to the rules of SigFigs.
Question 6
6.
How many liters (L) are in 2.012 x 1023 moles of CH4?
Remember to round according to the rules of SigFigs.
Question 7
7.
How many grams are in 7.8 liters (L) of CF4?
Remember to round according to the rules of SigFigs.
Question 8
8.
How many molecules are in 12.0 liters (L) of O2?
Remember to round according to the rules of SigFigs.
Question 9
9.
How many liters (L) of H2 are in 541.9 g of H2 gas?
Remember to round according to the rules of SigFigs.
Question 10
10.
How many grams are there in 20.1 L of CO2 gas?
Remember to round according to the rules of SigFigs.