1.

Ex.20 What is the percentage of sulphur in sulphuricacid (H2SO)?

Answer»

Percentage composition = (mass of the component/ total mass of the compound ) x100

Here, mass of S-atom = 32 gm and in H2SO4only one S-atom is present.

Further molar mass of H2SO4= 2 + 32+ 64 = 98 gm

Hence, percentage of sulphur = (32/98) x 100 = 32.65 %



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