One mole of any gas occupies 22.4 L @ STP so you have 2.24/224 = 0.1 mol of the gas. Then mol = grams/molar mass. Rearranging you get molar mass = grams/mols = 3.20/0.1 = 32
Which gas listed has a molar mass of 32?
3.20 g of unknown gas occupied 2.24 L at STP; Identify this gas from the following list: nitrogen, oxygen , hydrogen, methane CH4, of propane CH3CH2CH3.
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