The number of moles of NH3 that can be produced is 19.3 moles.
From the balanced equation of the reaction, the mole ratio of H2 reacted and NH3 produced is 3:2.
This means that for every 1 mole of H2 that reacts, 2/3 mole of NH3 will be produced.
Now, we have 29.0 moles of H2 reacting. If 1 mole of H2 produces 2/3 moles NH3, then 29 moles of H2 will produce:
29 x 2/3 = 19.3333 moles of NH3
To three significant figures, 19.333 moles will be 19.3 moles.
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