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this question. A 3.17 gram sample of an unknown gas is found to occupy a volume of 1.74 L at a pressure of 521 mm Hg and a temperature of 56C. The molecular weight of the unknown gas is g/mol. Assume ideal behavior. Submit Answer A sample of hydrogen gas has a density of g/L at a pressure of 1.03 atm and a temperature of 51C. Assume ideal behavior. Submit Answer A 0.105 mol sample of an unknown gas contained in 3.00 L flask is found to have a density of 1.33 g/L. The molecular weight of the unknown gas is g/mol