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The mass of an evacuated 275mL flask is 143.382g. The mass of the flask filled with 371mbar of an unknown gas at 25C is 143.674g.

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The mass of an evacuated 275mL flask is 143.382g. The mass of the flask filled with 371mbar of an unknown gas at 25C is 143.674g. Part A Calculate the molar mass of the unknown gas. Express the molar mass in grams per mole to three significant figures

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