20. Refer to the following equation: \[ 4\text{NH}_3(g) + 7\text{O}_2(g) \rightarrow 4\text{NO}_2(g) + 6\text{H}_2\text{O}(g) \] How many molecules of NO2 are produced when 5.38 mol of ammonia is completely reacted?
(A) 21.52
(B) 6.48 × 1024
(C) 3.24 × 1024
(D) 247
(E) none of these

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