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2 May, 18:43

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

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  1. 2 May, 19:23
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    - 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.
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