Anonymous asked in Business & FinancePersonal Finance · 8 months ago

chemistry help please?

The question is: 

A hard-water sample contains 0.0085% Ca by mass (In the form of Ca^2+ ions). What mass of water in grams contains 1.2 g of Ca? (1.2 g of Ca is the recommended daily allowance of calcium for 19-24 year olds)

I have no idea where to start, I'm so lost in this class!

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