Volume Relationships in Gaseous Reactions (Grade 11 NSC Matric Physical Sciences): Flashcards

Molar volume definition

Volume occupied by one mole of any gas at STP

Molar volume value at STP

22.4 dm³

STP stands for

Standard Temperature and Pressure

Formula for number of moles

$n = \frac{m}{M}$

Formula for volume at STP

$V = 22.4 \times n$

Does molar volume apply to all gases at STP?

Yes, any gas occupies 22.4 dm³ per mole at STP

Three steps for volume problems

1. Calc moles 2) Use mole ratios 3) Calc volume

Where do mole ratios come from?

Stoichiometric coefficients in balanced equation

Volume relationships apply to which state?

Gases only (not solids or liquids)

Required before volume calculations

Balanced chemical equation