The Δ r H o enthalpy value for the given formation reaction has to be calculated using the given values. Concept Introduction: Hess’s law is applied to calculate the enthalpy changes in a reaction. According to Hess’s law “The overall enthalpy change of a reaction is equal to the sum of the enthalpy changes involving in each and every individual steps in the reaction”. Thus if a reaction involves ‘n’ steps then enthalpy change Δ H ∘ of the reaction is, Δ H ∘ = Δ H ∘ 1 + Δ H ∘ 2 + Δ H ∘ 3 ...... + Δ H ∘ n Production of 1 mole of product from standard state elements is known as formation reaction.

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Chapter 4, Problem 75QRT

Interpretation Introduction

Interpretation:

The ΔrHoenthalpy value for the given formation reaction has to be calculated using the given values.

Concept Introduction:

Hess’s law is applied to calculate the enthalpy changes in a reaction. According to Hess’s law “The overall enthalpy change of a reaction is equal to the sum of the enthalpy changes involving in each and every individual steps in the reaction”. Thus if a reaction involves ‘n’ steps then enthalpy change ΔH∘ of the reaction is,

ΔH∘=ΔH∘1+ΔH∘2+ΔH∘3...... +ΔH∘n

Production of 1 mole of product from standard state elements is known as formation reaction.

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