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The question starts by stating, "A series of measurements are made in order to determine the molar mass of an unknown gas.". Then it continues:

A large gas flask is found to weigh 143.567 g. it is then filled with gas to a pressure of 735 torr at 31 C and found to weigh 1067.9 g (the density of water is 31 C is 0.997 g/mL). Assuming that the ideal gas equation applies, calculate the molar mass of the unknown.

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