The differences in boiling points of heptanes and pentane. Introduction: The point where substance starts boiling and turns into vapor is called boiling point. Pentane is an alkane of five carbon atoms, C 5 H 12 is the chemical formula and CH 3 CH 2 CH 2 CH 2 CH 3 is the structural formula. Heptane is a straight chain alkane. Its chemical formula is C 7 H 17 and structural formula is CH 3 CH 2 CH 2 CH 2 CH 2 CH 2 CH 3 . Boiling point of pentane is 36 ° C and heptane’s boiling point is 98 ° C . The molecules that have strong bond with each other through intermolecular forces like hydrogen bond, weak London forces, covalent bonding do not achieve the kinetic energy, which is required to escape the liquid state. Hence molecules with strong intermolecular forces have higher boiling point.

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Chapter 7, Problem 7.72AP

Summary Introduction

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The differences in boiling points of heptanes and pentane.

Introduction:

The point where substance starts boiling and turns into vapor is called boiling point.

Pentane is an alkane of five carbon atoms, C5H12 is the chemical formula and CH3 CH2CH2CH2CH3 is the structural formula.

Heptane is a straight chain alkane. Its chemical formula is C7H17 and structural formula is CH3CH2CH2CH2CH2CH2CH3.

Boiling point of pentane is 36°C and heptane’s boiling point is 98°C.

The molecules that have strong bond with each other through intermolecular forces like hydrogen bond, weak London forces, covalent bonding do not achieve the kinetic energy, which is required to escape the liquid state. Hence molecules with strong intermolecular forces have higher boiling point.

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