Chapter 13, Problem 20PS

### Chemistry & Chemical Reactivity

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

Chapter
Section

### Chemistry & Chemical Reactivity

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

# The Henry’s law constant for O2 in water at 25 ° is given in Table 13.2. Which of the following is a reasonable constant when the temperature is 50 °C? Explain the reason for your choice. (a) 6.7 × 10−4 mol/kg · bar (b) 2.6 × 10−3 mol/kg · bar (c) 1.3 × 10−3 mol/kg · bar (d) 6.4 × 10−3 mol/kg · bar TABLE 13.2Henry’s Law Constants for Gases in Water (25 °C)*

Interpretation Introduction

Interpretation: The henry constant of oxygen at 50oC to be identified.

Concept introduction:

Henry’s law: The solubility of a gas in liquid is directly proportional to the gas pressure.

Sg= kHPg,where,Sgisthegassolubility(inmol/kg)kHis Henry's constant Pg is the partial pressure of the gaseous solute.

Explanation

Given:â€‰â€‰Henry'sÂ lawÂ constantÂ ofÂ O2Â atÂ 25oC(KH)Â â€‰=Â â€‰1.3Ã—10-3â€‰(mol/Kg.bar)MoleÂ ofÂ O2inâ€‰1Kgâ€‰ofÂ waterâ€‰atâ€‹â€‰â€‰1-barÂ isÂ â€‰1.3Ã—10-3â€‰.1LÂ ofÂ waterÂ hasâ€‰massâ€‰â€‰=â€‰1â€‰kgConcentrationâ€‰â€‰=â€‰â€‰â€‰kHÃ—Â PO2(Henry'sÂ law)â€‰1

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