WAEC Chemistry 2018 Objective — Question 21
Question 21 of 50 from the West African Examinations Council (WAEC) Chemistry 2018 Objective paper, with the correct answer and a full explanation.
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The number of hydrogen ions in 1.0dm³ of 0.02moldm⁻³ tetraoxosulphate(VI) acid is [N_A=6.02×10²³]
- A. 1.2×10²²
- B. 1.2×10²³
- C. 2.4×10²²Correct
- D. 2.4×10²³
Explanation
moles H₂SO₄ = 0.02mol → moles H⁺ = 0.04mol. Number of ions = 0.04 × 6.02×10²³ = 2.4×10²².
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