(a) Define gram atomic mass of a substan...

(a) Define gram atomic mass of a substance. How much is the gram atomic mass of oxygen ?
(b) How many moles of oxygen atoms are present in one mole of the following compounds ?
(i) `Al_(2)O_(3)` , (ii) ` CO_(2)`, (iii) `Cl_(2)O_(7)` , (iv) `H_(2)SO_(4)` , (v) `Al_(2)(SO_(4))_(3)`

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