The balanced equation shows the formation of ammonia. cap n sub 2 plus 3 cap h sub 2 rightarrow 2 NH sub 3 How many moles of nitrogen are needed to completely convert 6 point 3 4 mol of hydrogen?

The balanced equation shows that 1 mol of nitrogen reacts with 3 mol of hydrogen. Divide 6.34 mol of hydrogen by 3: 6.34 ÷ 3 = 2.11 mol of nitrogen. Therefore, 2.11 mol of nitrogen are needed, which is choice B.

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