Question

deduce molecular masses of NA2SO4

Answer 1

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Na2So4 is also called sodium sulphate(Na2+ and So4 2-). The molecular weight of sodium sulphate is approx 142 gm/mol.

Mass of Na-22.98

Mass of S-32

Mass of O-15.99

So the total mass can be calculated as-: 22.98×2+32+15.99×4=142 gm.

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Answer 2

na2 =23×2=46
s =32
o4 =16×4=64
46 +64 +32 =142 u