The Henry’s law constant for O₂ in water at 25°C 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 × 10⁻² mol/kg ∙ bar

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TABLE 13.2 Henry's Law Constants for Gases in Water (25 C)* Gas He H N 0 CO CH CH6 KH (mol/kg-bar) 3.8 x 10-4 7.8 x 10-4 6.0 x 10-4 1.3 x 10- 0.034 1.4 x 10-3 1.9 10-3