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Ideal gas question from a past paper

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    For the June 2013 Unit 5 Edexcel physics paper Q16 asks what happens to a Pressure/Volume graph when:

    (i) air molecules are replaced with same number of molecules of lower mass

    (ii) temperature is substantially higher

    Mark scheme states

    (i) no change

    (ii) similar curve, shifted higher/to the right

    If someone could explain this (maybe using 0.5m(c^2)=1.5kT and PV=NkT) it would be really awesome . I'm struggling to understand it.

    i) pV=NkT as k and N are kept constant it makes sense that p and V are unchanged (constant)
    ii) pV=NkT N and k are constant but T increases either P or V would have to increase to keep equation balanced.
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