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Which of the following gases occupy the smallest volume at STP?

a) 1.000 mol carbon dioxide
b) 4.032 g H2
c) 35.45 g Cl2
d) 6.022 x 10^23 molecules of O2

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Why not just calculate the volume of each?
mols = grams/molar mass
mols = molecules/6.022E23
Use PV = nRT

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