The energy for the vaporization of 10.0 g of water has to be determined. Concept Introduction: Enthalpy H : it is the total amount of heat in a particular system. The value of heat formed in a reaction ΔH is calculated by the formula, ΔH= ∑ ( B o n d D i s s o c i a t i o n E n e r g y ) ( reactants ) − ∑ ( B o n d D i s s o c i a t i o n E n e r g y ) ( products ) If the value obtained for ΔH in a reaction is positive then it is an endothermic reaction whereas the value obtained for ΔH is negative it is an exothermic reaction. From its given mass is, Number of moles = Given mass Molecular mass

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Chapter 7, Problem 7.72CP

(a)

Interpretation Introduction

Interpretation:

The energy for the vaporization of 10.0 g of water has to be determined.

Concept Introduction:

Enthalpy H: it is the total amount of heat in a particular system.

The value of heat formed in a reaction ΔH is calculated by the formula,

ΔH=∑(Bond Dissociation Energy)(reactants) −∑(Bond Dissociation Energy)(products)

If the value obtained for ΔH in a reaction is positive then it is an endothermic reaction whereas the value obtained for ΔH is negative it is an exothermic reaction.

From its given mass is,

Number of moles = Given massMolecular mass

(b)

Interpretation Introduction

Interpretation:

The energy released for the condensation of 10.0 g of H2O(g) was to be determined.

Concept Introduction:

Enthalpy H: it is the total amount of heat in a particular system.

The value of heat formed in a reaction ΔH is calculated by the formula,

ΔH=∑(Bond Dissociation Energy)(reactants) −∑(Bond Dissociation Energy)(products)

If the value obtained for ΔH in a reaction is positive then it is an endothermic reaction whereas the value obtained for ΔH is negative it is an exothermic reaction.

From its given mass is,

Number of moles = Given massMolecular mass

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