Post-UTME Chemistry 2018 Objective — Question 5
Question 5 of 21 from the Post-UTME Screening (Post-UTME) Chemistry 2018 Objective paper, with the correct answer and a full explanation.
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500cm^3 of oxygen was collected over water at 30 degrees C and 752mmHg pressure. What is the volume of dry oxygen at S.T.P? (Vapour pressure of water at 30C = 32mmHg)
- A. 475cm^3
- B. 415cm^3
- C. 500cm^3
- D. 427cm^3Correct
Explanation
Dry gas pressure = 752-32 = 720mmHg. V(STP) = (720 x 500 x 273)/(760 x 303) = approx 427cm^3.
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