For each of the following gas-phase reactions, write therate expression in terms of the appearance of each productand disappearance of each reactant:(a) 2 H2O(g)---->2 H2(g) + O2(g)(b) 2 SO2(g) + O2(g)---->2 SO3(g)(c) 2 NO(g) + 2 H2(g) ----> N2(g) + 2 H2O(g)(d) N2(g) + 2 H2(g)----> N2H4(g)

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