Which of these statements are true? Select all that apply. The Delta H_rxn for t

Question

Which of these statements are true? Select all that apply. The Delta H_rxn for the reaction C(s) + O_2(g) rightarrow CO_2(g) is the same as the Delta H_f for CO_2(g). The Delta H_rxn for the reaction Na(s) + Cl_2(g) rightarrow 2NaCI(s) is the same as the Delta H_f for NaCI(s). The Delta H_f for Br_2(l) is 0 kJ/mol by definition. To determine the Delta H_t for H_2 O(g). just reverse the sign of the Delta H_rxn for the reaction 2H_2 O(l) rightarrow 2H_2(g) + O_2(g). The Delta H_f for N_2(l) is 0 kJ/mol by definition. The Delta H_rxn for the reaction 1.5H_2 (g) + 0.5N_2(g) rightarrow NH_3(g) is the same as the Delta H_f for NH_3(g).

Explanation / Answer

The statements in the options a , c, f are correct.

The reactions in options a and f shows the formation of compounds CO2 and NH3 from their constituent elements in the standard state,hence it can also be considered as the enthalpy of formation of these compounds .

Bromine exists in liquid state in its standard form , so the enthalpy of formation of Br(l) is 0 KJ/mol.

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