Chapter 6, Problem 6.72AP

Interpretation Introduction

Interpretation:

The volume occupied by propane when it is completely vaporized at STP has to be given.

Concept Introduction:

The amounts of gas are compared at a set of standard conditions of temperature and pressure, abbreviated as STP.  At STP, one mole of any gas has the same volume $\text{22}\text{.4 L}$ called the standard molar volume.

Example:

Under STP conditions, one mole of nitrogen gas and one mole of helium gas each contain $\text{6}{\text{.02×10}}^{\text{23}}$ particles of gas and occupy a volume of $\text{22}\text{.4 L}$ at ${\text{0}}^{\text{o}}\text{C}$ and $\text{1atm}$ pressure.  Since the molar masses of nitrogen and helium are different ($\text{28}\text{.02 g}$ for ${\text{N}}_{\text{2}}$ compared to $\text{4}\text{.003 g}$ for $\text{He}$) one mole of each substance has a different mass.