Chemistry / Ideal Gas Law Molar Mass
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Solution: The mass of an evacuated 255-mL flask is 143.187 g. The mass...

Question

The mass of an evacuated 255-mL flask is 143.187 g. The mass of the flask filled with 267 torr of an unknown gas at 25 °C is 143.289 g. Calculate the molar mass of the unknown gas.