what is the actual percent whater in unknown hydrate?

Question Description

I don’t understand this Chemistry question and need help to study.

I need to calculate the actual perce t in unknow hydrate.  the combination of the unknow is CuSO4•2h2o and FeSO4•7h2o.the intial mass of crucible and unknow was 25.43g.After it dehydrate was 23 .75 g and the crucible mass by itself was 21.11g.

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