Chemistry - Reacting masses
2010-02-20 1:13 am
A 240g sample of hydrated sodium sulphide, contain 162g of water of crystallization. Fing the number of the hydrate.
回答 (1)
2010-02-20 2:39 am
✔ 最佳答案
Let Na2S•nH2O be the formula of the hydrated sodium sulphide.Molar mass of Na2S = 23x 2 + 32 = 78 g/mol
Molar mass of H2O = 1x2 + 16 = 18 g/mol
Mole ratio Na2S : H2O
(240 - 162)/78 : 162/18 = 1 : n
1 : 9 = 1 : n
No. of hydrate, n = 9
參考: 老爺子
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