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Sagot :
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)
Enthalpy changes
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)
Learn more about about enthalpy changes at: https://brainly.com/question/14291557
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