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Heat of formation of $ CO\: and \: CO_2 $ are - 26.4 and -94.0 kcal/mole respectively. What is the heat of combustion of $CO$ in kcals ?

$\begin {array} {1 1} (1)\;+26.4 & \quad (2)\;120.6 \\ (3)\;-67.6 & \quad (4)\;135.2 \end {array}$

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