(Answered) What is the molar mass of a gas if 0281 g of the gas

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What is the molar mass of a gas if 0.281 g of the gas occupies a volume of 125 mL at a temperature 126 °C and a pressure of 777 torr? I am not sure how to figure this out. I thought that maybe I could get the molar mass from the osmotic pressure but the example in my book doesn't use the same values. Any help would be greatly appreciated.

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