Answer :

iii) < ΔU

According to the first law of thermodynamics,

we need to find ∆ng by writing the chemical equation of combustion of methane.
where, ∆ng=total mole of gaseous products - total mole of gaseous reactants.

Combustion of methane:
CH4(g) + 2O2(g) --> CO2(g) + 2H2O(l)

∆ng = 1 - (1 + 2) = -2

=-(X°+RT) < -X°

hence, ∆H°< ∆U°

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