please help! i have a chemistry lab report due tommorrow and i dont understand how to...

Nida S

New member
...do this calculation? heres the question, Im not trying to get people to do my homework for me, but if theres a formula or a step-by-step method as to how to do this, please let me know!

I've been given the chemical formula of 7 hydrates, and its asking that we find the percentage of water in each. it says: "heres a hint: for each compound, calculate how much water, in grams, that is in one mole of the hydrate. compare this mass to the mass of one mole of the hydrate." im not understanding how this hint would help.
 
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