# Which of the following pairs have the same number of atoms ?(i) 16 g of  (g) and 4 g of  (g)(ii) 16 g of  and 44 g of (iii) 28 g of  and 32 g of (iv) 12 g of C (s) and 23 g of Na(s)

The answer are the options (iii) and (iv)

Explanation:

One mole is measured as the amount of a substance that equal number of atoms as contained in exactly 12 g of Carbon.

1 mole of C = 12g C

While 23 grams of Na (mass) = 1 mole of Na

28g N2 = 1 mole of nitrogen = 2 × atoms of nitrogen

This is atoms of nitrogen

32g O2 = 1 mole of oxygen =  atoms of oxygen

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