Δ H of the formation of one mole of HCl gas is to be determined. Concept introduction: Hess’s law is used to calculate the enthalpy change of an overall reaction that can be derived as a sum of two or more reaction. According to Hess’s law Δ H of an overall reaction is equal to the sum of the enthalpy change for each individual reaction. Δ H overall rxn = Δ H 1 + Δ H 2 + ....... + Δ H n Enthalpy is a state function so the value depends upon the initial state and final state not on the path so Δ H of an overall reaction can be calculated by the addition or subtraction of the individual steps whose Δ H is known.

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Chapter 6.5, Problem 6.9BFP

Interpretation Introduction

Interpretation:

ΔH of the formation of one mole of HCl gas is to be determined.

Concept introduction:

Hess’s law is used to calculate the enthalpy change of an overall reaction that can be derived as a sum of two or more reaction. According to Hess’s law ΔH of an overall reaction is equal to the sum of the enthalpy change for each individual reaction. ΔHoverall rxn=ΔH1+ΔH2+.......+ΔHn

Enthalpy is a state function so the value depends upon the initial state and final state not on the path so ΔH of an overall reaction can be calculated by the addition or subtraction of the individual steps whose ΔH is known.

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