Which of the following reactions are exothermic? A. 2Mg(s) + O_2(g) rightarrow 2

Question

Which of the following reactions are exothermic? A. 2Mg(s) + O_2(g) rightarrow 2MgO(s) DeltaH = -1203 kJ/mol B. NH_3(g) + HCl(g) rightarrow NH_4Cl(s) DeltaH = -176 kJ/mol C. AgCl(s) rightarrow Ag^+ (aq) + Cl^-(aq) DeltaH = 127 kJ/mol D. 2Fe_2O_3(s) + 3C(s) rightarrow 4Fe(s) + 3CO_2(g) DeltaH = 468 kJ/mol E. C(graphite) + O_2(g) rightarrow CO_2(g) DeltaH = -393.5 kJ/mol F. CH_4(g) + 2O_2(g) rightarrow CO_2(g) + 2H_2O(l) DeltaH = -891 kJ/mol Check all exothermic reactions. Reaction A Reaction B Reaction C Reaction D Reaction E Reaction F

Explanation / Answer

The reaction is exothermic if heat is released in a reaction

that is H of reaction is negative

H is negative for reaction A,B,E,F

So, exothermic reactions are:

Reaction A

Reaction B

Reaction E

Reaction F

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