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Tutu_93:
I am stuck in a question in chemistry

A 1.39 g sample of hydrated copper (2) sulfate ( cuso4.xH2O)is heated until all the water of hydration is driven off.The anhydrous salt has a mass of 0.89 g . determine the formula of the hydrate ??

Ghost Of Highbury:
First use the mass of the copper sulfate after all the water is gone to determine the moles of CuSO4

0.89/159.5 = 0.0055

The mass loss on heating can be used to determine the moles of water lost:

(1.39 - 0.89)/[(2 x 1) + 16] = 0.0278

Now determine the ratio of water to CuSO4

0.0278/0.0055 ~ 5
----
(because its moles of water to moles of copper sulfate ratio)

Tutu_93:
Yaa i knw ..
 The actual answer is 5

Ghost Of Highbury:
i edited it..check again

Tutu_93:
:D:D:D:D :D thhhhnnnnnk u

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