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Chemistry

10th Edition
Steven S. Zumdahl + 2 others
ISBN: 9781305957404

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BuyFindarrow_forward

Chemistry

10th Edition
Steven S. Zumdahl + 2 others
ISBN: 9781305957404
Textbook Problem

Which of the following statements is( are) true?

a. LiF will have a higher vapor pressure at 25°C than H2S.

b. HF will have a lower vapor pressure at −50°C than HBr.

c. Cl2, will have a higher boiling point than Ar.

d. HCl is more soluble in water than in CCI4.

e. MgO will have a higher vapor pressure at 25°C than CH3CH2OH.

Interpretation Introduction

Interpretation: Either the given statements are true or false to be identified.

Concept Introduction

Intermolecular forces:

  • The forces involving within the molecule are called intermolecular forces.
  • The state of the molecule is depended upon the intermolecular forces.
  • The increasing intermolecular forces respect with states of molecule is,

Gas < liquid < solid

The vapor pressure also depends upon the intermolecular forces.

Types of intermolecular forces and its decreasing order is,

  • Ion-dipole
    • Dipole- Dipole Forces
    • Hydrogen bond
    • London Dispersion Forces
Explanation

Explanation

(a)

To explain  LiF has lower vapour pressure than water at 25°C is true statement.

 LiF is an ionic compound. The ionic forces present in  LiF   are very stronger than intermolecular forces found in H2S. Therefore  LiF has lower vapour pressure than water at 25°C.

(b)

To explain HF has lower vapor than HBr at -50°C is true statement.

HF is a polar molecule. Therefore the inter molecular forces was found to be dipole -dipole and the interaction between the hydrogen atom and  Fluorine atom, hydrogen bond is a special type of dipole - dipole. But HBr has no hydrogen bond. Therefore HF has lower boiling point.

(c)

To explain Cl2 has having higher boiling point than Ar is the correct statement

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