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17 December, 10:31

A 11.97g sample of NaBr contains 22.34 % Na by mass. Considering the law of constant composition (definite proportions), how many grams of sodium does a 9.51g sample of sodium bromide contain?

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  1. 17 December, 14:23
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    2.125 g

    Explanation:

    We have;

    Mass of NaBr sample is 11.97 g % composition by mass of Na in the sample is 22.34%

    We are required to determine the mass of 9.51 g of a NaBr sample.

    Based on the law of of constant composition, a given sample of a compound will always contain the sample percentage composition of a given element.

    In this case,

    A sample of 11.97 g of NaBr contains 22.34% of Na by mass Therefore;

    A sample of 9.51 g of NaBr will also contain 22.345 of Na by mass

    But;

    % composition of an element by mass = (Mass of element : mass of the compound) * 100

    Therefore;

    Mass of the element = (% composition of an element * mass of the compound) : 100

    Therefore;

    Mass of sodium = (22.34% * 9.51 g) : 100

    = 2.125 g

    Thus, the mass of sodium in 9.51 g of NaBr is 2.125 g
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