Posted by rose on Thursday, October 18, 2012 at 6:05am.
I assume we are talking about:
3 H2 + N2 --> 2 NH3
H2 is 2*1 = 2 g/mol
N2 is 2*14 = 28 g/mol
forget g vs kg because we are only interested in ratios here
3 mol H2 is 6 g
so we need 6 g of H2 for every 28 g of N2
31.5 g of N2 needs 31.5 * 6/28 = 6.75 g H2 needed
BUT we only have 5.22 g H2 so the H2 limits the reaction.
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