Answer:
(c) Exothermic reaction
for combustion of one mole of butane is represented as :
\[{{C}_{4}}{{H}_{10}}(g)+\frac{13}{2}{{O}_{2}}(g)\to
4C{{O}_{2}}(g)+5{{H}_{2}}O(l)\]
\[{{\Delta
}_{c}}H=-2658kJ\,mo{{l}^{-1}}\]
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