Compared to a 1.0-L sample of CO2 (g) in a sealed, rigid container at STP, a 1.0-L sample of CH4(g) in a sealed, rigid container at STP has the same
(1) density
(2) molar mass
(3) chemical properties
(4) number of molecules
Answer and Explanation:
STP stands for standard temperature and pressure. If two gases have the same volume (1L), same temperature and same pressure, they must also have the same number of moles according to the ideal gas law PV=nRT. Same number of moles means they must have the same number of molecules.
Choice 4 is the correct answer.
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August 2022 test