JAMB Chemistry 2020 Objective — Question 2
Question 2 of 40 from the Joint Admissions and Matriculation Board (JAMB) Chemistry 2020 Objective paper, with the correct answer and a full explanation.
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2. The volume occupied by a certain of hydrogen gas collected over water at 28°C and 769mmHg was 35cm3. What would be the volume in cm3 of the dry gas at S.T.P if the saturated vapour pressure of water at 28°C is 13.5mmHg?
- A. A. 35.00
- B. B. 234.2
- C. C. 31.6Correct
- D. D. 17.3
Explanation
Pressure of dry gas = 769-13.5 = 755.5mmHg at 301K. Using P1V1/T1 = P2V2/T2: (755.5x35)/301 = (760xV2)/273, giving V2 ≈ 31.6cm3.
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