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A 115mL flask is evacuated and found to have a mass of 97.129g. When the flask is filled with 777 torr of helium gas at

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A 115mL flask is evacuated and found to have a mass of 97.129g. When the flask is filled with 777 torr of helium gas at 39C, it is found to have a Calculate the molar mass of gas in the flask. mass of 97.171g. Express your answer in grams per mole to two significant figures

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