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 = 34 a.m.u.

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