What is the standard enthalpy change for a reaction at equilibrium?

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Question: What is the standard enthalpy change for a reaction at equilibrium?

Options:

Correct Answer: ΔH = 0

Solution:

At equilibrium, the forward and reverse reactions occur at the same rate, resulting in no net change in enthalpy (ΔH = 0).

What is the standard enthalpy change for a reaction at equilibrium?

What is the standard enthalpy change for a reaction at equilibrium?

Step 1: Understand that a chemical reaction can go in two directions: forward (reactants to products) and reverse (products to reactants).
Step 2: At equilibrium, the rate of the forward reaction equals the rate of the reverse reaction.
Step 3: Because the rates are equal, the amounts of reactants and products remain constant over time.
Step 4: Since there is no net change in the amounts of reactants and products, there is also no net change in energy.
Step 5: Therefore, the standard enthalpy change (ΔH) for the reaction at equilibrium is zero (ΔH = 0).

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