What is the volume of a 32 gram sample of CH4 gas at STP?

Question

i need this for homework it is very hard

 

Answer 1

First, calculate the number of moles:

 

Moles CH₄ = (gram CH₄ ) / (Molar Mass of CH₄ )

 

Molar Mass of CH₄ = 12.01+4(1.008) = 12.01+4.032 = 16.042

 

Mole CH₄ = 32 / 16.042

 

               =1.99

 

1 mole of a gas at S.T.P occupies a volume of 22.4 Liters

 

Therefore, Volume occupied by 1.99 moles = 1.99 * 22.4 Liters

 

               = 44.576 Liters

 

Volume of a 32 gram of CH₄ gas at S.T.P = 45 Liters