Problem: 0.413 g of a gas fills a 250.0 mL flask and exerts an pressure of 0.996 atm at 21 ° C. What is the molar mass of the gas? Express your answer in units of g/mol, but do not include the units in your submitted answer.

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0.413 g of a gas fills a 250.0 mL flask and exerts an pressure of 0.996 atm at 21 ° C. What is the molar mass of the gas? Express your answer in units of g/mol, but do not include the units in your submitted answer.