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# Chemistry help asap Watch

1. 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
2. no its 14/17 * 100
3. I thought you have to divide it by the total ar of both elements
4. (Original post by Queenz123)
I thought you have to divide it by the total ar of both elements
the ar of nitrogen is 14...
5. (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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