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A one litre glass bulb is evacuated and ...

A one litre glass bulb is evacuated and weighed. The weight is 500 g. It is then filled with an ideal gas at 1 atm pressure at 312.5 K. The weight of the filled bulb is 501.2 g. The molar weight of the gas is : `(R = 8 xx 10^(-2) L atm K^(-1) mol^(-1))`

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