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Q 3182845737.     Which of these weighs most?
(i) `32 g` of oxygen, (ii) `2 g` atom of hydrogen,
(iii) `0.5` mole of `Fe`, (iv) `3.01 xx 10^(23)` atoms of carbon
(Provided By a Student and Checked/Corrected by EXXAMM.com Team)