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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 heats of fusion of three substances are listed below. Explain the trend this list reflects.

msp;  HI                     2 . 87 kJ / mol HBr               2 . 41 kJ / mol HCl                 1 . 99 kJ / mol

Interpretation Introduction

Interpretation:

The given order of heats of fusion for HI, HBr, HCl must be explained.

Concept Introduction:

Heat of fusion is the thermal energy required to melt one mole solid to one mole liquid at constant pressure.

Explanation

Heats of fusion depend on molecular weight in case of covalent compound. More the surface area more is the van der Waal forces of attraction more is the heat of fusion. Surface area of HI is maximum and its minimum for HCl among HI,  HBr,  HCl

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