Mole ConceptHard

Question

A quantity of 5 g of a crystalline salt when rendered anhydrous lost 1.8 g of water. The formula mass of the anhydrous salt is 160. The number of molecules of water of crystallization in the salt is

Options

A.3
B.5
C.2
D.1

Solution

$\frac{1.8}{18n} = \frac{5 - 1.8}{160} \Rightarrow n = 5$

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