A 500.0-mL sample of pure water is allowed to come to equilibrium with pure oxygen gas at

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A 500.0-mL sample of pure water is allowed to come to equilibrium with pure oxygen gas at a pressure of 755 mmHg.

What mass of oxygen gas dissolves in the water? (The Henry’s law constant for oxygen gas is 1.3 * 10-3 M/atm.)

a) 15.7 g 

b) 6.5 * 10-3 g

c) 0.041 g 

d) 0.021 g

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