For which of the following reactions is ΔH∘rxnΔHrxn∘ equal to ΔH∘fΔHf∘ of the product (s) ? You do not need to look up any values to answer this question. Check all that apply. View Available Hint (s) Check all that apply. 2Na (s) + Cl2 (g) →2NaCl (s) 2Na (s) + Cl2 (g) →2NaCl (s) Na (s) + 12Cl2 (l) →NaCl (s) Na (s) + 12Cl2 (l) →NaCl (s) CaCO3 (g) →CaO+CO2 (g) CaCO3 (g) →CaO+CO2 (g) C (s) + O2 (g) →CO2 (g) C (s) + O2 (g) →CO2 (g) CO (g) + 12O2 (g) →CO2 (g) CO (g) + 12O2 (g) →CO2 (g) Na (s) + 12Cl2 (g) →NaCl (s) Na (s) + 12Cl2 (g) →NaCl (s) Submit Part B

- 2Na (s) + Cl2 (g) →2NaCl (s)

- Na (s) + 1/2Cl2 (l) →NaCl (s)

- C (s) + O2 (g) →CO2 (g)

Explanation:

Hello,

In this case, we shall remember that formation reactions are those involving the direct reaction of the elements forming the required compound. In such a way, for the given reactions:

2Na (s) + Cl2 (g) →2NaCl (s)

Na (s) + 1/2Cl2 (l) →NaCl (s)

CaCO3 (g) →CaO+CO2 (g)

C (s) + O2 (g) →CO2 (g)

CO (g) + 1/2O2 (g) →CO2 (g)

Just:

2Na (s) + Cl2 (g) →2NaCl (s)

Na (s) + 1/2Cl2 (l) →NaCl (s)

C (s) + O2 (g) →CO2 (g)

Involve the elements composing the final products at the reactants. For that reason, the enthalpy of reaction (ΔH°rxn) result equal to the enthalpy of formation (ΔH°f) of the given product.

Regards.