Which of the following reaction does not...

Which of the following reaction does not define standard enthalpy of formation `(Delta H_f^@)`?

`C(diamond)+O_2(g)rarrCO_2(g)`

`1/2H_2(g)+1/2F_2(g)rarrHF(g)`

`N_2(g)+3H_2(g)rarr2NH_3(g)`

`CO(g)+1/2O_2(g)rarr CO_2(g)`

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Which of the following reactions do(es)n't represent the standard state enthalpy of formation reaction?

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For which of the following reactions does the standard enthalpy of reaction represent the standard enthalpy of formation of CH_(4)(g) ? Explain it. (a) C(diamond, s) +4H_(2)(g)toCH_(4)(g) (b) C(graphite, s) +O_(2)(g)toCH_(4)(g) .

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In which of the following standard enthalpy of formation (Delta H_(f)^(0)) is zero ?

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In which of the following reactions does DeltaH^(0) at 25^(@)C indicate the standard enthalpy of formation (DeltaH_(f)^(0)) of the compound formed in each of the reactions? (2) N_(2)(g)+3H_(2)(g)to2NH_(3)(g) (2) (1)/(2)N_(2)(g)+(1)/(3)O_(3)(g)toNO(g) .

Which of the following element standard enthalpy is not to be equal to zero?

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