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    Basically for the question on aqa NH3 I put the percentage as 88%
    This is because I did 15/17 *100 and I got 88%
    Is this correct
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    no its 14/17 * 100
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    I thought you have to divide it by the total ar of both elements
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    (Original post by Queenz123)
    I thought you have to divide it by the total ar of both elements
    the ar of nitrogen is 14...
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    (Original post by Queenz123)
    I thought you have to divide it by the total ar of both elements
    Total Mr of NH3 = 17
    N = 14
    H X 3 = 3
    Mr of NH3 = 17
    Therefore Mr of N/ total mr of nh3 X 100
 
 
 
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