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Principles of General Chemistry | 2nd Edition | ISBN: 9780073511085 | Authors: Martin S. Silberberg
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Which member in each pair of liquids has the higher vapor

Chapter 11, Problem 38P

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QUESTION:

Problem 38P

Which member in each pair of liquids has the higher vapor pressure at a given temperature? Explain.

(a) C2H6 or C4H10

(b) CH3CH2OH or CH3CH2F

(c) NH3 or PH3

Questions & Answers

QUESTION:

Problem 38P

Which member in each pair of liquids has the higher vapor pressure at a given temperature? Explain.

(a) C2H6 or C4H10

(b) CH3CH2OH or CH3CH2F

(c) NH3 or PH3

ANSWER:

Solution 38P

Here we have to explain which member in each pair of liquids has the higher vapor pressure at a given temperature.

The vapour pressure of a molecule depends on the intermolecular forces. Weaker the intermolecular forces, higher will be the vapour pressure.

Step 1

(a) C2H6 or C4H10

The vapour pressure of C2H6 is higher than C4H10 due to its (C2H4) smaller size. It is known that the dispersion force decreases with decreasing the molecular size. Hence weaker dispersion force leads to higher vapour pressure.

Thus the vapour pressure of C2H6 is higher.

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