the weight of anhydrous salt is 54.4gm ,then the weight of water in crystalline salt is 45.6gms then what is tha weight of water in crystalline salt if the weight of the anhydrous salt is 258 gms ?also find the number of molecules of water of crystallisation ?

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Solution

$W e i g h t o f a n h y d r o u s s a l t = 54.4 g W e i g h t o f w a t e r = 45.6 g W e i g h t % o f w a t e r = \frac{45.6}{100} \times 100 = 45.6 % i n t h e h y d r a t e d s a l t W e i g h t % o f w a t e r w i t h r e s p e c t t o a n h y d r o u s s a l t m a s s 54.4 g = \frac{45.6}{54.4} \times 100 = 83.82 % W e i g h t o f w a t e r w i t h r e s p e c t t o a n h y d r o u s s a l t o f m a s s 258 g = \frac{83.82 \times 258}{100} = 216.26 g N o o f m o l e c u l e s o f w a t e r = \frac{216.26}{18} = 12$

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