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I am pretty confused about this problem. Can anyone offer some suggestions? Pretty please.

All of the gas inside of a flask is removed and the flask is found to weigh 123.17g. It is filled with a gas of unknown molar mass until the pressure inside the flask is 658 torr at 23 degrees celcius. The flask is then found to weigh 132.92g with the unknown gas. The unknown gas is removed and the flask is filled with water and found to weigh 1002.65g. Assuming the ideal gas equation holds, what is the molar mass of the unknown gas?

I know that the density of water at 23 degrees celcius is 0.999g/ml. Would I use the equation Density=Pressure X Mass / R X Temp.?

THANKYOU!

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# What is the molar mass of the unknown gas?

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