alleryStart learning →Which rearrangement of the ideal gas equation gives the molar mass of a gas?
AMolar mass equals mRT divided by PV
BMolar mass equals PV divided by mRT
CMolar mass equals mPV divided by RT
DMolar mass equals RT divided by mPV
Answer & Solution
Correct answer: A. Molar mass equals mRT divided by PV
1. Molar mass is defined as the mass in grams divided by the amount in moles.
2. Rearranging PV = nRT gives n equals PV over RT.
3. Substituting that for n gives molar mass equals m times R times T divided by P times V.
4. So a mass, a volume, a pressure and a temperature are enough to identify an unknown gas.
_Source: OpenStax Chemistry (CC BY 4.0), Ch 9 "Gases", section 9.3 Stoichiometry of Gaseous Substances, Mixtures, and Reactions_
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