The Δ H ° for the roasting of galena, PbS has to be calculated and also whether the reaction is endothermic or exothermic has to be given Concept Introduction: Enthalpy of reaction: The enthalpy of a reaction is calculated by subtracting the heat of formation of reactatns from heat of formation of products. Δ H ° = ∑ Δ H ° f Pr odcuts - ∑ Δ H ° f Reactants Exothermic and Endothermic Reaction: Exothermic reaction is a reaction in which heat is given out to the surrounding from the system. Δ H ° for an exothermic reaction will be negative. Endothermic reaction is a reaction in which heat is gained by the system from the surrounding. Δ H ° for an exothermic reaction will be positive.

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Chapter 21, Problem 21.85QP

Interpretation Introduction

Interpretation:

The ΔH° for the roasting of galena, PbS has to be calculated and also whether the reaction is endothermic or exothermic has to be given

Concept Introduction:

Enthalpy of reaction:

The enthalpy of a reaction is calculated by subtracting the heat of formation of reactatns from heat of formation of products.

ΔH° =∑ΔH°f Prodcuts - ∑ΔH°f Reactants

Exothermic and Endothermic Reaction:

Exothermic reaction is a reaction in which heat is given out to the surrounding from the system. ΔH° for an exothermic reaction will be negative.

Endothermic reaction is a reaction in which heat is gained by the system from the surrounding. ΔH° for an exothermic reaction will be positive.

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