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For which of the following reactions doe...

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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(b).
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  3. For which of the following reactions does the standard enthalpy of rea...

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