food and nutrition

O2 Water

Question: Fish generally need an O2 concentration in water of at least 4 mg/L for survival. What partial pressure of oxy? What partial pressure of oxygen above the water (in atmospheres at 0 C ) is needed to obtain this concentration? The solubility of O2 in water at 0 C and 1 atm partial pressure is . 2.21 x 10^-3 mol/L

Answer: 2e-3 mol dissolved O2/ L = 1 atm O2 gas (we'll use this as a conversion factor in a moment) (4 mg / L) / (16 g / mol) = 0.25 mmol O2 / L (0.25 mmol O2 / L) (1 atm O2 gas / 2e-3 mol O2/ L) = 0.125 atm O2 gas m

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