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A

Anonymous

Feb 14, 2025

A chemist decomposes samples of several compounds. The masses of their constituent elements are listed. Calculate the chemical formula

A chemist has decomposed samples of several compounds and has provided the masses of their constituent elements. Based on this information, please calculate the chemical formula for each compound.

2 Answers

A
Anonymous

Oct 18, 2024

We need to know the molar masses of every element in the given compound first.a) 58.69 g = 1 mole of NiTherefore, 1.245 g = 0.0212 moles126.9 g = 1 mole of I Therefore, 5.381 g = 0.0424 molesRatio of Ni : I = 0.0212 / 0.0424 = 1 : 2Therefore, empirical formula is NiI2b) 137.327g = 1 mole of Ba2.677 g = 0.0195 moles 79.90 g = 1 mole of Br3.115 g = 0.0390 molesRatio of Ba : Br = 0.0195 / 0.0390 = 1 : 2Therefore, the empirical formula is BaBr2.c) 9.012 g = 1 mole of Be2.128 g = 0.236 moles32.065 g = 1 mole of S7.557 g = 0.236 moles15.999 g = 1 mole of O15.107 g = 0.944 molesTherefore, ratio of Be : S : O = 0.236 : 0.236 : 0.944 = 1 : 1 : 4Therefore, the empirical formula is BeSO4.
A
Anonymous

Oct 19, 2024

you can see the empirical formula at the pic

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