<p>The heats of combustion of carbon and carbon monoxide are -393.5 and -283.5 kJ&nbsp;<math xmlns="http://www.w3.org/1998/Math/MathML"><mi>m</mi><mi>o</mi><msup><mi>l</mi><mrow><mo>-</mo><mn>1</mn></mrow></msup></math>, respectively. The heat of formation (in kJ) of carbon monoxide per mole is:</p>