Answer:
(b)\[C(s)+2{{H}_{2}}(g)\to
C{{H}_{4}}(g)\]
\[{{\Delta }_{f}}H={{\Delta }_{f}}U+\Delta {{n}_{g}}RT\]
\[={{\Delta }_{f}}U+\left\{ 4-\left( \frac{15}{2} \right)
\right\}\times RT\]
\[={{\Delta }_{f}}U-\frac{7}{2}RT\]
\[\therefore \]\[{{\Delta
}_{f}}H<{{\Delta }_{f}}U\]
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