Question

which of the following would change the enthalpy of a reaction? adding a catalyst changing reaction conditions changing the temperature none of these

Explanation:

Enthalpy of a reaction depends on the nature of reactants and products and the temperature. A catalyst only affects the rate - not the enthalpy. Changing reactant concentrations doesn't change the enthalpy of the reaction itself. But changing the temperature changes the enthalpy of the reaction as enthalpy is temperature - dependent.

Answer:

Changing the temperature