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(a) Define mole. What are the two things...

(a) Define mole. What are the two things that a mole represents.
(b) What weight of each element is present in `1.5` moles of sodium sulphate , `Na_(2)SO_(3)` ?
(Atomic masses : `Na = 23 u , C = 12 u , O = 16 u`)

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