Naddie
How do i determine the formula for the hydrate composed of Mg=12% , Cl= 34.8%. H=6.0% and O=47.2%



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aaronq
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is that % by mass?

Naddie
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I think so, the question didn't say.

aaronq
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assume the mass is 100g then convert everything to moles, then everything by the lowest amount of moles

aaronq
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then divide**