Gce Model Questions Vol1 2018 Chemistry Question 17
Practice objective / multiple choice question 17 from the 2018 Gce Model Questions Vol1 Chemistry examination.
A river at 25 °C contains dissolved oxygen (DO) measured at 10.0 mg L\(^{-1}\). The solubility of O\(_2\) at this temperature is given by Henry's constant \(k_H = 1.3\times10^{-3}\,\text{mol L}^{-1}\,\text{atm}^{-1}\) and the partial pressure of O\(_2\) in air is 0.21 atm. (a) State whether the water is supersaturated with respect to O\(_2\) and calculate the excess O\(_2\) concentration (mg L\(^{-1}\)). (b) If a degassing unit removes excess O\(_2\) at a rate of 0.5 mg L\(^{-1}\) min\(^{-1}\), how long (to one decimal place) will it take to bring the DO down to equilibrium?
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About This Question
This is Gce Model Questions Vol1 2018 Chemistry Question 17. It is one of the objective questions from the 2018 Gce Model Questions Vol1 Chemistry examination.
Difficulty level: Hard .
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