JAMB Chemistry 2025 Objective — Question 5

Question 5 of 40 from the Joint Admissions and Matriculation Board (JAMB) Chemistry 2025 Objective paper, with the correct answer and a full explanation.

If 9.0 g of aluminum reacts completely with excess hydrochloric acid, what volume of hydrogen gas will be produced at STP?

A. 11.2 dm³Correct
B. 16.8 dm³
C. 22.4 dm³
D. 33.6 dm³

Explanation

2Al + 6HCl → 2AlCl₃ + 3H₂. Moles Al = 9/27 = 0.333 mol. Moles H₂ = 0.5 mol. Volume = 0.5 × 22.4 = 11.2 dm³.

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