STANDARDChemistry-Solutions
STANDARD Chemistry Henry's Law MCQ Question
Type: MCQ-numerical-Medium-Class 12
How much oxygen is dissolved in 100 mL water at 298 K if partial pressure of oxygen is 0.5 atm and Kₕ = 1.4 × 10⁻³ mol/L/atm?
A
22.4 mg
B
22.4 g
C
2.24 g
D
2.24 mg
Correct Answer
Option D
Detailed Explanation
Using Henry's law, the concentration of dissolved oxygen is given by C = Kₕ × p = 1.4 × 10⁻³ mol/L/atm × 0.5 atm = 7 × 10⁻⁴ mol/L. Converting to mass: 7 × 10⁻⁴ mol/L × 32 g/mol × 0.1 L = 2.24 mg.
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