From the thermo chemical reactions, C(graphite)12O2→CO;∆H=-110.5kJCO+12O2→; ∆H=-283.2kJ the heat of reaction of C(graphite)+O2→CO2 is

C(graphite)+12O2→CO;∆H=-110.5kJCO+12O2→CO2;∆H=-283.2kJCgraphite+O2→CO2x=-110.5+(-283.2)x=-393.7kJ

From the thermo chemical reactions, C(graphite)12O2→CO;∆H=-110.5kJCO+12O2→; ∆H=-283.2kJ the heat of reaction of C(graphite)+O2→CO2 is

C(graphite)+12O2→CO;∆H=-110.5kJCO+12O2→CO2;∆H=-283.2kJCgraphite+O2→CO2x=-110.5+(-283.2)x=-393.7kJ

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From the thermo chemical reactions, $C_{(graphite)} \frac{1}{2} O_{2} \to CO; ∆ H = - 110.5 kJ$ $CO + \frac{1}{2} O_{2} \to; ∆ H = - 283.2 kJ$ the heat of reaction of $C_{(graphite)} + O_{2} \to {CO}_{2} is$

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+172.7 kJ

-393.7 kJ

-172.7 kJ

+393.7 kJ

answer is B.

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Detailed Solution

$C_{(g r a p h i t e)} + \frac{1}{2} O_{2} \to C O; ∆ H = - 110.5 k J$

$C O + \frac{1}{2} O_{2} \to C O_{2}; ∆ H = - 283.2 k J$

$C_{g r a p h i t e} + O_{2} \to C O_{2}$

$x = - 110.5 + (- 283.2)$

$x = - 393.7 k J$

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