JAMB - Chemistry (1997 - No. 12)
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)
(Mg = 24, S = 32, O = 16, H = 1)
1
3
5
7
Penjelasan
MgSO4. YH2O
120g (MgSo4) contains - 18g (water)
20g contain (41 - 20g) water.
120g ā 18 y; 20 ā 21
ā“ 18 y = (126)/(18) = 7
120g (MgSo4) contains - 18g (water)
20g contain (41 - 20g) water.
120g ā 18 y; 20 ā 21
ā“ 18 y = (126)/(18) = 7