Question

The enthalpy change in the reaction $2CO+O_2\to 2C{O}_2$ is termed as

• A. enthalpy of reaction
• B. enthalpy of fusion
• C. enthalpy of combustion
• D. enthalpy of formation

Answer 1

Answer: (A)

Since the given reaction is a balanced chemical reaction, the enthalpy change occurring during the reaction is called enthalpy of reaction $({\Delta }_{r}H)$ . (Remember, here the enthalpy change cannot be said enthalpy of combustion because two moles of $CO$ are used while heat of combustion is the heat liberated when one mole of a substance undergoes combustion in excess of oxygen.)