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    Why do we have to use pV = nRT to get its answer? Why can't we assume that mass of ice and steam will be the same and use that to find moles of steam? From those moles why can we just multiply them by 24 and get B as the answer? The answer in mark scheme is C.

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    You're heating it to 596k, not 298k.
    Doing it your way gives you the volume at 298k. It asks for 596k so double your answer to get C.

    You know that the temp and volume are directly propotional from PV=nRT.
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    (Original post by Ollie901)
    You're heating it to 596k, not 298k.
    Doing it your way gives you the volume at 298k. It asks for 596k so double your answer to get C.

    You know that the temp and volume are directly propotional from PV=nRT.
    So I can double that volume Or use the molar gas equation at that temperature, right?
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    24 is a handy approximation, useful for rough work. If you want a more accurate answer or are not at room temperature and pressure then use the ideal gas equation
 
 
 
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