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Which of the following reactions is an enthalpy of formation reaction?

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Which of the following reactions is an enthalpy of formation reaction? 

1. CH4(g) + 2O2(g) ←→ CO2(g) + 2H2O

2. 2Fe(s) + 3/2O2(g) ←→ Fe2O3(s)

3. Cdiamond(s) + 2H2(g) ←→ CH4(g) 

4. Hg(s) + 1/2O2(g) ←→ HgO(s)

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1 Answer

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Best answer

Correct option 2. 2Fe(s) + 3/2O2(g) ←→ Fe2O3(s)

Explanation:

Formation reactions describe production of exactly one mole of one product from stoichiometric quantities of elements in their standard states.

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