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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 × 1023 atoms of carbon.

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(i) 32 g of oxygen weighs most. 

(ii) 2 g atom of H2 = 2g 

(iii) 0.5 mole of Fe = mole × atomic weight = 0.5 × 56 = 28 g 

(iv) 6.022 × 1023 = 1 atom of d 3.01 × 1023 atoms of C = 1/2 × 12 = 6 g.

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