JEE Main · 2004 · 24 Apr 2004 · Offline · Chemical Thermodynamics

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The enthalpies of combustion of carbon and carbon monoxide are -393.5 and respectively. The enthalpy of formation of carbon monoxide per mole is
  1. (A)110.5 kJ
  2. (B)-110.5 kJ✓ Correct
  3. (C)-676.5 kJ
  4. (D)676.5 kJ

Answer: (B)

Solution

Write the two combustions: at and at . The formation of carbon monoxide, , is got by subtracting the second from the first, so by Hess's law .

JEE Main · 2004 · 24 Apr 2004 · Offline · Single correct option

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