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29 March, 20:21

Kaolinite, a clay mineral with the formula Al4Si4O10 (OH) 8, is used as a filler in slick-paper for magazines and as a raw material for ceramics. Analysis shows that 14.35 g of kaolinite contains 8.009 g of oxygen. Calculate the mass percent of oxygen in kaolinite.

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  1. 29 March, 20:48
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    55.81%

    Explanation:

    Mass percentage composition of an element in a compound can be calculated by dividing the mass of the element in the compound by the relative formula mass of the compound and expressing it as a percentage.

    Therefore;

    % composition = (Mass of the element / relative formula mass) 100%

    In this case;

    We are given the mass of the element (oxygen) and the mass of the compound (Kaolinite) thus;

    Mass % of oxygen in kaolinite = (Mass of oxygen / mass of Kaolinite) 100%

    % composition of Oxygen = (8.009 g/14.35 g) 100%

    = 55.81 %

    Therefore; the mass percent of oxygen in Kaolinite is 55.81%
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