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6 December, 19:48

A 100-g sample of zinc sulfide contains 67.1 g zinc and 32.9 g sulfur. If a 1.19-g sample of zinc is heated with excess sulfur, 1.77 g of zinc sulfide forms. Are these data in agreement with the law of definite proportions?

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  1. 6 December, 23:12
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    As per the law of definite proportion a chemical compound will always contain the same elements that combine together in the same ratio by mass.

    In case 1:

    Mass of Zinc sulfide sample = 100 g

    Mass of Zn = 67.1 g

    Mass of sulfur = 32.9 g

    Ratio Zn : S = 67.1 : 32.9 = 2:1

    In case 2:

    Mass of zinc sulfide formed = 1.77 g

    Mass of Zinc taken = 1.19 g

    Mass of sulfur = 1.77 - 1.19 = 0.58 g

    Ratio Zn:S = 1.19 : 0.58 = 2:1

    Since the ratio in both cases are the same, the data is in agreement with the law of definite proportion.
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