A potential energy diagram is shown. What is the total change in enthalpy of this reaction? 25 kJ 30 kJ 35 kJ 55 kJ

Answer : The total change in enthalpy of this reaction is 25 kJ.

Explanation :

Enthalpy of reaction : It is defined as the changes in heat energy takes place when reactants go to products. It is denotes as .

ΔH = Energy of product - Energy of reactant

ΔH is positive when heat is absorbed and the reaction is endothermic.

ΔH is negative when heat is released and the reaction is exothermic.

In the given potential energy diagram, the energy of product at higher level and energy of reactant at lower level. The ΔH for this reaction will be positive.

Given:

Energy of product = 55 kJ

Energy of reactant = 30 kJ

ΔH = Energy of product - Energy of reactant

ΔH = 55 kJ - 30 kJ

ΔH = 25 kJ

Thus, the total change in enthalpy of this reaction is 25 kJ.

the enthalpy of formation of water is given as -285.8kj/mol, which states that the enthalpy of formation is negative.

negative enthalpy of formation indicates that the heat is released during the reaction process. the heat is released from reaction to the surroundings the enthalpy is expressed with a negative sign with the energy given out in the reaction process.

the formation of water takes place by giving out heat which is -285.8 kj/mol.

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