Which of these statements are true? Select all that apply. The Delta. Hrxn for the reaction C(s) O2(g) Right arrow. CO2(g) is the same as the Delta. Hf for CO2(g). The Delta. Hrxn for the reaction Na(s) Cl2(g) Right arrow. 2NaCl(s) is the same as the Delta. Hf for NaCl(s). The Delta. Hf for Br2(l) is 0 kJ/mol by definition. To determine the Delta. Hf for H2O(g), just reverse the sign of the Delta. Hrxn for the reaction 2H2O(l) Right arrow. 2H2(g) O2(g). The Delta. Hf for N2(l) is 0 kJ/mol by definition. The Delta. Hrxn for the reaction 1. 5H2(g) 0. 5N2(g) Right arrow. NH3(g) is the same as the Delta. Hf for NH3(g).

ΔHrxn for the reaction C(s) + O2(g) -----> CO2(g) is the same as the ΔHf for CO2(g)
ΔHf for Br2(l) is 0 kJ/mol by definition.
ΔHrxn for the reaction 1. 5H2(g) + 0. 5N2(g) ---> NH3(g) is the same as the ΔHf for NH3(g)

Enthalpy changes are the heat changes that occurs during a chemical reaction.

Based on enthalpy changes the following statements from the given options are true:

ΔHrxn for the reaction C(s) + O2(g) -----> CO2(g) is the same as the ΔHf for CO2(g) since the reaction produces CO2
ΔHf for Br2(l) is 0 kJ/mol by definition.
ΔHrxn for the reaction 1. 5H2(g) + 0. 5N2(g) ---> NH3(g) is the same as the ΔHf for NH3(g) since the product of the first reaction is the same as reaction 2.

Therefore, based on the enthalpy changes, the true statements are:

ΔHrxn for the reaction C(s) + O2(g) -----> CO2(g) is the same as the ΔHf for CO2(g)
ΔHf for Br2(l) is 0 kJ/mol by definition.
ΔHrxn for the reaction 1. 5H2(g) + 0. 5N2(g) ---> NH3(g) is the same as the ΔHf for NH3(g)

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