Aqa a level chemistry exam question help!!!

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somone456
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Zinc forms many different salts including zinc sulfate, zinc chloride and zinc fluoride.
(a) People who have a zinc deficiency can take hydrated zinc sulfate (ZnSO4.xH2O) as a dietary supplement.
A student heated 4.38 g of hydrated zinc sulfate and obtained 2.46 g of anhydrous zinc sulfate.
Use these data to calculate the value of the integer x in ZnSO4.xH2O
Show your working.

I know why how to get the ratio of 1:7, but why is the answer x=7? can someone help thanks
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pashionfruit
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The ratio 1:7 is the ratio of ZnSO4 to H2O. Therefore for every 1 mole of ZnSO4, you will have 7 moles of H2O.
As the question asks for the number of moles which joins to 1 mole of ZnSO4, x=7
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zak.820
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how do u do this question?
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