What percentage of the total mass of the compound $K A l_{2} S_{2} O_{3}$ $KAl_2S_2O_3$ is due to the sulfur in the compound?

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Answer 1 · 2018-01-27T22:11:22

The sulfur accounts for 31.3 % of the mass of the compound.

You must determine two values:

The molar mass of the compound - for $K A l_{2} S_{2} O_{3}$ $KAl_2S_2O_3$ this is 39.1 + (2 x 27.0) + (2 x 32.1) + (3 x 16.0) = 205.3 g
The mass of the requested element in this formula. In this case, each formula unit contains two sulfur atoms, so the mass is 64.2 g

Divide 2 by 1:

$\frac{64.2}{205.3} = 0.313$ $64.2/205.3 = 0.313$ or 31.3 %

What percentage of the total mass of the compound KAl2S2O3KAl_2S_2O_3 is due to the sulfur in the compound?