O-LevelChemistryStoichiometry5070/11 · May/June 2023 · Q91 Mark
Samples of two hydrated compounds are weighed and then dehydrated by heating. The anhydrous compounds are weighed and the results are shown. 3.97 g FeSO4•xH2O gives 2.17 g anhydrous FeSO4. 2.88 g CaSO4•yH2O gives 2.27 g anhydrous CaSO4. What are the values of x and y? [Mr: FeSO4, 152; CaSO4, 136; H2O, 18]
Ax: 5, y: 2
Bx: 5, y: 5
Cx: 7, y: 5
Dx: 7, y: 2
✓ Correct answer
D: x: 7, y: 2
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