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On combustion, carbon forms two oxides \( \mathrm{CO} \) and
P \( \mathrm{CO}_{2} \). Heat of formation of \( \mathrm{CO}_{2} \) is \( -393.5 \mathrm{~kJ} \) and

W that of \( \mathrm{CO} \) is \( -110.5 \mathrm{~kJ} \). Heat of combustion of \( \mathrm{CO} \) is:
(1) \( -393.5 \mathrm{~kJ} \)
(2) \( -504.0 \mathrm{~kJ} \)
(3) \( -283.0 \mathrm{~kJ} \)
(4) \( 2830.0 \mathrm{~kJ} \)
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