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Chemistry & Chemical Reactivity

10th Edition
John C. Kotz + 3 others
ISBN: 9781337399074

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BuyFindarrow_forward

Chemistry & Chemical Reactivity

10th Edition
John C. Kotz + 3 others
ISBN: 9781337399074
Textbook Problem

Account for these facts:

  1. (a) Although ethanol (C2H5OH) (bp, 80 °C) has a higher molar mass than water (bp, 100 °C), the alcohol has a lower boiling point.
  2. (b) Mixing 50 mL of ethanol with 50 mL of water produces a solution with a volume slightly less than 100 mL.

(a)

Interpretation Introduction

Interpretation:

Reason for ethanol having fewer boiling points has to be identified.

Concept Introduction: A hydrogen bonding is partially an electrostatic attraction between H atom which is bonded to more electronegative atom such as N, O, orF and another adjacent atom bearing a lone pair of electron.

If intermolecular force is small the vapor pressure of the substance is high and the boiling point will be low.

Explanation

Water has two  OH bonds and two lobe pairs of electrons whereas the O atom of ethanol has only one

(b)

Interpretation Introduction

Reason for mixing equal volume of ethanol and water produces a volume less than expected has to be identified.

Concept Introduction: A hydrogen bonding is partially an electrostatic attraction between H atom which is bonded to more electronegative atom such as N, O, orF and another adjacent atom bearing a lone pair of electron.

If intermolecular force is small the vapor pressure of the substance is high and the boiling point will be low.

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