JAMB Biology 2015 Objective — Question 26
Question 26 of 50 from the Joint Admissions and Matriculation Board (JAMB) Biology 2015 Objective paper, with the correct answer and a full explanation.
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24g of magnesium reacts with dilute hydrochloric acid. Calculate the volume of hydrogen gas evolved at s.t.p. [Mg=24, Molar volume of gas at s.t.p. = 22.4dm³]
- A. 22.4dm³Correct
- B. 5.6dm³
- C. 11.2dm³
- D. 44.8dm³
Explanation
Moles of Mg = 24/24 = 1 mol. Mg + 2HCl → MgCl₂ + H₂, so 1 mol Mg produces 1 mol H₂ = 22.4dm³ at s.t.p.
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