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How many grams of H2 are needed to produce 14.21g of NH3?

How many grams of H2 are needed to produce 14.21g  of NH3?

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Hi Kels,
H=1  N=17    2N + 3H2 ------ 2NH3    So, from 3 g"r of H2 you get 40 g"r of NH3 (remember it's 2NH3).  In order to get 14.21 g"r of NH3 you need 3 * 14.21/40 g"r of H2.  That is: 1.066 g"r H2.
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