A gas sample is known to be a mixture of ethane and butane, Ask an Expert

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A gas sample is known to be a mixture of ethane and butane. A bulb of 200.0 cm^3 capacity is filled with the gas to a pressure of 100.0 x 10^3 Pa at 20.0 degrees C. If the weight of the gas in the bulb is 0.3846 g, what is the mole percent of butane in the mixture?

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