Use molar volume to calculate each of the following at STP:...

Use molar volume to calculate each of the following at STP:
a. the number of moles of $\mathrm{O}_{2}$ in $44.8 \mathrm{L}$ of $\mathrm{O}_{2}$ gas
b. the volume, in liters, occupied by 0.420 mole of He gas

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Key Concepts

Standard Temperature and Pressure (STP)

STP refers to a standard set of conditions, typically 0°C (273.15 K) and 1 atmosphere of pressure, under which gases are commonly compared. At STP, one mole of an ideal gas occupies a fixed volume, allowing for straightforward calculations and comparisons using molar volume.

Molar Volume

Molar volume is the volume occupied by one mole of a substance, usually a gas, under specified conditions such as STP. For ideal gases, this value is approximately 22.4 liters per mole at STP, providing a direct conversion factor between the number of moles and the gas volume.

Conversion Using Dimensional Analysis

Dimensional analysis is a systematic method used to convert between different units by multiplying by conversion factors. In the context of gases at STP, it allows for the conversion of gas volumes to moles (or vice versa) by applying the molar volume as a conversion factor.

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