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For which of the following reactions does ΔHrxn represent an enthalpy of formation? 2N2(g) + 3O2(g)...

For which of the following reactions does ΔHrxn represent an enthalpy of formation?

2N2(g) + 3O2(g) => 2NO2(g) + 2NO(g)

N2(g) + O2(g) => 2NO(g)

2NO2(g) => N2O4(g)

N2(g) + 2O2(g) => 2NO2(g)

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Answer #1

enthapy of formation is the enthalpy change when there is formation of one mol of a substance with its constituent elements in their standard state.

Chemical reactions 1,2 and 4  doesn't represent enthalpy of formation because there is formation of 2 mol of product instead of one mol.

In Chemical reaction 2, reactants are not in standard state ie in N2(g) and O2(g) . Therefore, it is also doesn't represent enthalpy of formation.

Therefore, none of reaction' s ΔHrxn represent enthalpy of formation.

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