The minimum mass concentration of oxygen required for fish life is 4 mg L^–1.

(a) Assume the density of lake water to be 1.00 g · mL^–1, and express this concentration in parts per million (which is equivalent to milligrams of O₂ per kilogram of water, mg · kg^–1).

(b) What is the minimum partial pressure of O₂ that would supply the minimum mass concentration of oxygen in water to support fish life at 20°C?

(c) What is the minimum atmospheric pressure that would give this partial pressure, assuming that oxygen exerts about 21% of the atmospheric pressure? See Table 5D.2.

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