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At 298 K, the Henry's law constant for oxygen is 0

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At 298 K, the Henry's law constant for oxygen is 0.00130 M/atm. Air is 21.0% oxygen.

1) At 298 K, what is the solubility of oxygen in water exposed to air at 1.00 atm?

2) At 298 K, what is the solubility of oxygen in water exposed to air at 0.89 atm?

3) If atmospheric pressure suddenly changes from 1.00 atm to 0.893 atm at 298 K, how much oxygen will be released from 4.70L of water in an unsealed container?