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Introductory Chemistry: A Foundati...

9th Edition
Steven S. Zumdahl + 1 other
ISBN: 9781337399425

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BuyFindarrow_forward

Introductory Chemistry: A Foundati...

9th Edition
Steven S. Zumdahl + 1 other
ISBN: 9781337399425
Textbook Problem
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The molar heats of fusion and vaporization for silver are 11 . 3 kJ / mol and 25 0.  kJ / mol respectively. Silver’s normal melting point is 962  ° C , and its normal bailing point is 2212  ° C . What quantity of heat is required to melt 12 . 5 g of silver at 962  ° C ? What quantity of heat is liberated when 4 . 59 g of silver vapor condenses at 2212  ° C ?

Interpretation Introduction

Interpretation:

The heat required to melt 12.5g silver and heat liberated when 4.59g silver vapor condenses to liquid silver must be calculated.

Concept Introduction:

During melting and vaporization there is no temperature change as only latent heat is used for phase change. Melting is endothermic process whereas condensation of vapor to liquid is an exothermic process.

Explanation

Given information:

Heat of fusion and heat of vaporization of silver as 11.3kJ/mol and 250kJ/mol respectively.

Heat of fusion of silver is 11.3kJ/mol.

So fusion of 108g silver needs 11.3kJ heat energy

Fusion of 1g silver needs 11.3kJ/108 heat energy

Fusion of 12.5g silver needs (11.3×12.5)kJ108 heat energy = 141.25kJ108 heat energy = 1

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