Question

19. The crystalline salt na2so4. Xh2o on heating loses 55.9% of its weight. The formula of the crystalline salt is

Answer 1

Answer:

Na2SO4 . 10 H2O

Explanation:

On heating , it loses all water molecules

In a 100 g compound

Weight of X water = 55.9 g

Weight of Na2SO4 = 100 - 55.9 = 44.1 g

mol of Na2SO4 = mol of water / X

44.1 / 142 =  (55.9/18) / X

X = 10

So compound = Na2SO4 . 10 H2O

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