JAMB Chemistry 2019 Objective — Question 6
Question 6 of 40 from the Joint Admissions and Matriculation Board (JAMB) Chemistry 2019 Objective paper, with the correct answer and a full explanation.
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The vapour pressure of water at 15°C is 13mmHg. At a barometric pressure of 747mmHg, 2dm³ of nitrogen gas is collected over water at 15°C. The pressure of the nitrogen gas is
- A. 760mmHg
- B. 747mmHg
- C. 734mmHgCorrect
- D. 732mmHg
Explanation
When a gas is collected over water, the total pressure recorded is the sum of the gas pressure and the water vapour pressure. P(gas) = P(total) − P(H₂O vapour) = 747−13 = 734mmHg.
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