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29 July, 17:45

Calcium carbonate () is 34.5% Ca by mass. In a 418 g sample of, how many grams of calcium are present?

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  1. 29 July, 18:11
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    144.2 g of Ca are present in 418 g of sample

    Explanation:

    34.5 % Ca → In 100 g of salt there are 34.5 g of Ca

    Let's make a rule of three:

    In 100 g of salt there are 34.5 g of Ca

    In 418 g of salt there must be (418. 34.5) / 100 = 144.2 g
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