WAEC Chemistry 2019 Objective — Question 22
Question 22 of 50 from the West African Examinations Council (WAEC) Chemistry 2019 Objective paper, with the correct answer and a full explanation.
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Consider the following reaction equation: 2Al(OH)3+3H2SO4→Al2(SO4)3+6H2O. How many moles of tetraoxosulphate(VI) acid is needed to produce 0.5 mol of aluminium tetraoxosulphate(VI)?
- A. 0.5
- B. 1.0
- C. 1.5Correct
- D. 3.0
Explanation
From the equation, 1 mole of Al2(SO4)3 requires 3 moles of H2SO4. Therefore 0.5 mol of Al2(SO4)3 requires (3/1) × 0.5 = 1.5 moles of H2SO4.
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