   Chapter 5, Problem 34PS

Chapter
Section
Textbook Problem

Calcium carbide, CaC2, is manufactured by the reaction of CaO with carbon at a high temperature. (Calcium carbide is then used to make acetylene.)CaO(s) + 3 C(s) → CaC2(s) + CO(g)△rH° = +464.8 kJ/mol-rxnIs this reaction endothermic or exothermic? What is the enthalpy change if 10.0 g of CaO is allowed to react with an excess of carbon?

Interpretation Introduction

Interpretation:

The enthalpy change of the reaction has to be determined.

Concept Introduction:

Standard enthalpy of the reaction ΔrHo is the change in enthalpy that happens when matter is transformed by a given chemical reaction, when all reactants and products are in their standard states.

Enthalpy of the reaction,ΔrH is the change in enthalpy that happens when matter is transformed by a given chemical reaction

The change in enthalpy, ΔH in kJ per mole of a given reactant for the reaction can be calculated as:

ΔrH=enthalpy changenumber of moles

ΔrH=ΔHnumber of moles

Explanation

Given,

ΔrHo=+464.8kJ/mol

Mass=10g

Determine the amount of CaO in 10g

Number of moles= massofthesolutemolarmass

10g(1mol÷56.0774 g) = 0

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