Q. 24.3( 110 Votes )

Calculate the for

Answer :

(i) Formula mass of ZnO = Mass of Zn atom + Mass of 0 atom

= 65 + 16 = 81 u

(ii) Formula mass of Na₂0 = Mass of 2Na atoms + Mass of 0

= 2 X 23 + 16 = 46 + 16 = 62 u

(iii) Formula mass of K₂C0₃ = Mass of two potassium atoms + one carbon atom + three oxygen atoms = 2 X39 + 12+ 3 X16 = 78+ 12+ 48 = 138 u

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