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A fixed mass of gas at STP occupies a ce...

A fixed mass of gas at STP occupies a certain volume. The gas is heated and allowed to expand to a double its volume with its pressure doubled. What can you say about the average kinetic energy of the gas molecules?

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To obtain doubled volume with doubled pressure, the temperature in kelvin must be four time the volume in STP (`(PV)/(T)=`constant). Since the average kinetic energy proportions to the temperature linearly, the kinetic energy of the gas is four times before heating up.
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