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2 November, 09:30

A sample of pure calcium fluoride with a mass of 15.0 g contains 7.70 g of calcium. How much calcium is contained in 45.0 g of calcium fluoride

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  1. 2 November, 09:42
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    23.1 g of Ca

    Solution:

    It is a simple proportional problem in which we will find either the increased or decreased value of calcium with proportional to Calcium fluoride.

    Therefore as given,

    15.0 g of pure CaF₂ contains = 7.70 g of Ca

    So,

    45.0 g of pure CaF₂ will contain = X g of Ca

    Solving for X,

    X = (45.0 g * 7.70 g) : 15.0 g

    X = 23.1 g of Ca

    Hence, as the amount of CaF₂ has increased from 15.0 g to 45.0 g therefore, the amount of Ca it contained also increased from 7.70 g to 23.1 g.
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