Write the mathematical expression for the reaction quotient, Qc , for each of the following reactions: (a) N2 (g) + 3H2 (g) ⇌ 2NH3 (g) (b) 4NH3 (g) + 5O2 (g) ⇌ 4NO(g) + 6H2 O(g) (c) N2 O4 (g) ⇌ 2NO2

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