A 0.201-mol sample of an unknown gas contained in a 5.00 L flask is found to have a density of 1.72 g/L. What is the molar mass of the unknown gas? 

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density = massa/volum massa = density * volum massa = 1.72 * 5 = 8.1 molar mass = massa / mol molar mass = 8.1 / 0.201 molar mass = 42.786