We are asked to rank the gases Ar, N2, CH4, and C2H6 in order of increasing density at STP.
Since the volume of 1 mole of gas is the same for each ideal gas:
↑ Molar mass, ↑ density.
Rank the gases Ar, N2, CH4, and C2H6 in order of increasing density at STP.
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What scientific concept do you need to know in order to solve this problem?
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