JAMB Chemistry 2018 Objective — Question 28

Question 28 of 36 from the Joint Admissions and Matriculation Board (JAMB) Chemistry 2018 Objective paper, with the correct answer and a full explanation.

Calculate the amount in moles of a gas which occupies 10.5dm³ at 6atm and 30°C. (R = 0.82 atm dm³K⁻¹mol⁻¹)

A. 2.536
B. 1.623Correct
C. 4.736
D. 0.394

Explanation

Using PV=nRT: n = PV/RT = (6×10.5)/(0.082×303) ≈ 63/24.85 ≈ 1.623 mol (using R≈0.082, T=303K).

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