On recrystallization, 20g of magnesium tetraoxosuphate (IV) forms 41 g of magnesium tetraoxosulphate (IV) crystals,...

JAMB 1997

On recrystallization, 20g of magnesium tetraoxosuphate (IV) forms 41 g of magnesium tetraoxosulphate (IV) crystals, MgSO₄. yH₂O. The value of y is?

(Mg = 24, S = 32, O = 16, H = 1)

A. 1
B. 3
C. 5
D. 7

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Correct Answer: Option D

Explanation

MgSO₄. YH₂O
120g (MgSo₄) contains - 18g (water)
20g contain (41 - 20g) water.
120g → 18 y; 20 → 21
∴ 18 y = (126)/(18) = 7

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On recrystallization, 20g of magnesium tetraoxosuphate (IV) forms 41 g of magnesium tetraoxosulphate (IV) crystals,...

Correct Answer: Option D

Explanation

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