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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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Which of the following statements is(are) true?

LiF will have a higher vapor pressure at 25  ° C than H 2 S .

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

Cl 2 will have a higher boiling point than Ar .

HCl is more soluble in water than in CCl 4 .

MgO will have a higher vapor pressure at 25  ° C than CH 3 CH 2 OH .

Interpretation Introduction

Interpretation:

The true statements should be identified from the given statements.

Concept Introduction:

Vapor pressure depends on volatility and vapor pressure increases with increase in volatility.

Solubility depends on interaction between solvents and solutes.

Explanation

Reason for true statements:

Statement b) is true as HF has more boiling point as compared to HBr. This is due to the ability of HF to form intermolecular hydrogen bonds unlike HBr. So, HF is less volatile and will have lower vapor pressure as compared to HBr.

Statement c) is true statement as Cl2 has higher boiling point as compared to Ar due to more surface area thus resulting in more London force.

Statement d) is a true statement as HCl is a polar molecule and hence expected to be more soluble in polar solvent like water than non-polar solvent CCl4.

Statements b, c and d are true statements.

Boiling point of HF is more than that of HBr. So, HF will be less volatile as compared to HBr. So vapor pressure will be less in case of HF than that of HBr.

Cl2 is diatomic molecule whereas Ar is monatomic. So the surface area of Cl2 is greater as compared to Ar. As higher surface area contributes greater van der Waal force thus boiling point of Cl2 will be more as compared to Ar.

HCl is a polar molecule which prefers polar solvent. Water is a polar protic solvent unlike CCl4 which is a non polar aprotic solvent. So HCl will be more soluble in water than in CCl4.

Reason for false statements:

Statements a and e are false statements.

Statement a is false as LiF will have more boiling point as compared to H2S and thus LiF will have lesser vapor pressure as compared to H2S

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