Explain what is the mole percent of butane in the mixture

Explain what is the mole percent of butane in the mixture

Explain what is the mole percent of butane in the mixture
Chemistry
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?