A100−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?

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.

we can conclude that the melting point of table salt is above room temperature (it's actually 801 deg c). the melting point of mercury must be below room temperature (- 39 deg c).

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