Calculate the relative molecular mass of H2S.

Atomic mass of hydrogen = 1 a.m.u.

Atomic mass of Sulphur = 32 a.m.u.

Thus, the molecular mass of hydrogen sulphide, which contains two atoms of hydrogen and one atom of sulphur is

= 2 – 1 + 1 -32


Therefore, the relative molecular mass of hydrogen sulphide is 34a.m.u

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