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    This paper here: http://www.ocr.org.uk/Images/243745-...nian-world.pdf

    Question 6 part c, in the mark scheme to solve this question you need to state that

    Pressure = mass/volume,
    &
    number of moles = mass/molecular mass

    and then rearrange and substitute them into the ideal gas equation to get the answer required. However what is confusing me is that isn't density = mass/volume. So where does the statement pressure = mass/volume come from?
    Could anybody explain this, would be greatly appreciated as my exam is tomorrow.

    Mark scheme: http://www.ocr.org.uk/Images/236084-...world-june.pdf

    Thanks a lot if anybody can help with this
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    It's not pressure = mass / volume it's density = mass / volume (i.e. rho not P)
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    Yup, for the scheme you posted, it shows density. Are you using an up to date adobe reader to view this pdf file?
 
 
 
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