1.

The molar mass of Na2SO4 is ……(a) 129 (b) 142 (c) 110 (d) 70

Answer»

(b) 142 

Na2SO4 = Molar mass 

= (23 x 2) + (32 x 1) + (16 x 4) 

= 46 + 32 + 64 

= 142



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