(Answered) A large flask with a volume of 936 ml is evacuated and

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A large flask with a volume of 936 mL is evacuated and found to have a mass of 134.66 g. It is then filled to a pressure of 0.967 atm at 31 °C with a gas of unknown molar mass and then reweighed to give a new mass of 136.41 g. What is the molar mass of this gas?

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