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Q.

 Heat of formation of CO and CO2 are –26.4,- 94.0 kcal/mole respectively. What is the heat of combustion of CO in kcals ?

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a

+26.4

b

120.6

c

–67.6

d

135.2

answer is C.

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Detailed Solution

begin{array}{l} {C_{(s)}} + frac{1}{2}{O_2}_{(g)} to C{O_{(g)}},,Delta {H_1} = - 26.4Kcal/mole to (1)\ {C_{(s)}} + {O_2}_{(g)} to C{O_2}_{(g)},,Delta {H_2} = - 94Kcal/mole to (2)\ C{O_{(g)}}, + frac{1}{2}{O_2}_{(g)} to C{O_2}_{(g)},,Delta H_C = ?, to (3)\\ eq.(2) - eq.(1),(or)frac{1}{{eq.(1)}} + eq.(2) Rightarrow eq.(3)\\ {Delta _C}H(CO) = ,Delta {H_2} - Delta {H_1} = - 94 - ( - 26.4) = - 67.6Kcal/mole end{array}

 

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