A-LevelChemistryAtoms, molecules and stoichiometry9701/12 · Feb/Mar 2023 · Q151 Mark
Hydrated cobalt(II) sulfate loses water when heated to give anhydrous cobalt(II) sulfate. All the water of crystallisation is lost to the atmosphere as steam. When 3.10 g of hydrated cobalt(II) sulfate, CoSO₄•xH₂O, is heated to constant mass the loss in mass is 1.39 g. What is the value of x, to the nearest whole number?
A4
B6
C7
D11
✓ Correct answer
C: 7
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