For the species in the reaction below, A H° f is zero for 2Co (s) + H2 (g} + 8PF3 (g) - Co (s) 2HC0(PF3)4 (1) H2 (g) HCo(PF3)4 (1) PF3 (g) hoth Cafst and Ha fo) QUESTION 14 For which one of the following equations is AH°rxn equal to A H° f for the product? CH4 (g) + 2C12 (g) CH2C12 (1) N2 (g) + O3 (g) - N203 (g) - 2C0 (g) + 02 (g)→ 2C02 (g) +! Xe (g) + 2F2 (g) → XeF4 (g) C(diamond) + O2 (o) COn (e) QUESTION 15 For which one of the following reactions is the value of AH°, to A H° f for the product? rxn equal C2H2 (g) + H2 (g) → C2H4 (g) C (diamond) + O2 (g) CO2 (g) 3Mg (s) + N2 (g) Mg3N2 (s) 2Ca (s) + 02 (g) 2CAO (s) 2C (eranhite) +0 () 200 (e) QUESTION 16 For which one of the following reactions is the value of A H°rxn equal to A H°f for the product? 2C (s, graphite) + 2H2(g) C2H4 (g) N2 (g) + 02 (8) -2NO (g) H20 (1) + 1/2 O2 (g) → H202 (1) 2H2 (g) + 02 (g) → 2H20 (1) 2H () + O () 2H0() QUESTION 17 For which one of the following reactions is the value of A H°rxn equal to A H°ffor the product? 2H2 (g) + 02 (g) 2H20 (1) N2 (g) + 02 (g) 2NO (g)

For the species in the reaction below, A H° f is zero for 2Co (s) + H2 (g} + 8PF3 (g) - Co (s) 2HC0(PF3)4 (1) H2 (g) HCo(PF3)4 (1) PF3 (g) hoth Cafst and Ha fo) QUESTION 14 For which one of the following equations is AH°rxn equal to A H° f for the product? CH4 (g) + 2C12 (g) CH2C12 (1) N2 (g) + O3 (g) - N203 (g) - 2C0 (g) + 02 (g)→ 2C02 (g) +! Xe (g) + 2F2 (g) → XeF4 (g) C(diamond) + O2 (o) COn (e) QUESTION 15 For which one of the following reactions is the value of AH°, to A H° f for the product? rxn equal C2H2 (g) + H2 (g) → C2H4 (g) C (diamond) + O2 (g) CO2 (g) 3Mg (s) + N2 (g) Mg3N2 (s) 2Ca (s) + 02 (g) 2CAO (s) 2C (eranhite) +0 () 200 (e) QUESTION 16 For which one of the following reactions is the value of A H°rxn equal to A H°f for the product? 2C (s, graphite) + 2H2(g) C2H4 (g) N2 (g) + 02 (8) -2NO (g) H20 (1) + 1/2 O2 (g) → H202 (1) 2H2 (g) + 02 (g) → 2H20 (1) 2H () + O () 2H0() QUESTION 17 For which one of the following reactions is the value of A H°rxn equal to A H°ffor the product? 2H2 (g) + 02 (g) 2H20 (1) N2 (g) + 02 (g) 2NO (g)