Molar Volume of Gases | GCSE Chemistry Practice
The volume of one mole of any gas at room temperature and pressure is $24 dm^3$.
Calculate the volume of 2 moles of Carbon Dioxide at RTP.
What is Molar Volume of Gases | Practice?
"The volume occupied by one mole of a gas at a specific temperature and pressure."
Calculate the relative formula mass (Mr) of H2O. (H=1, O=16)
Calculate the mass of 0.25 moles of Calcium Carbonate (CaCO3). (Mr=100)
How many moles are in 36g of water? (Mr of H2O = 18)
Which formula is used to calculate the number of moles?
Gas Volume Rule
Volume ($dm^3$) = Moles x 24.
RTP: Room Temperature and Pressure ($20^circ C$, 1 atmosphere).
Works for ANY gas regardless of its $M_r$.
Essential for stoichiometry calculations involving gases.
Exam Fact: If the volume is given in $cm^3$, you must convert it to $dm^3$ (divide by 1000) before using the 24 rule.
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