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Chemistry · May / June 2026 · Paper 11 · Question 9

5070The mole and the Avogadro constant

Hydrated magnesium sulfate has the formula MgSO4•7H2O. [A_r: Mg, 24; S, 32; O, 16; H, 1] Which mass of hydrated magnesium sulfate is needed to make 250 cm^3 of a solution containing 0.50 moles per litre of magnesium ions, Mg^2+?

  1. A15.00
  2. B30.75
  3. C61.50
  4. D123.0

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Correct answer: B. 30.75

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