What is the percent composition of H2S?

1 Answer
Apr 2, 2016

5.92%H, 94.08%S

Explanation:

Total mass of a compound is found by adding up the mass of all the atoms. Using mass numbers from the RSC periodic table, the total mass of the compound H2S is

21.008gmol1+132.06gmol1=34.076gmol1

Percentage mass of an element in a compound is given by

MeMt100%

where Me is the mass of all the atoms of the element and Mt is the total mass of the compound.

Percentage mass of hydrogen therefore is

2.016gmol134.076gmol1100%=5.92%

And, likewise, percentage mass of sulfur is

32.06gmol134.076gmol1100%=94.08%