Problem: Select which of the following standard enthalpy of formation values is not zero at 25°CNa(s)CH4(g)H(g)Hg(l)Ne(g)S8 (monoclinic)

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The enthalpy of formation of an element in its standard state is zero.


We simply need to identify which are not in standard state.


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Problem Details

Select which of the following standard enthalpy of formation values is not zero at 25°C

Na(s)

CH4(g)

H(g)

Hg(l)

Ne(g)

S8 (monoclinic)

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