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Which of the following pairs have the same number of atoms?

(i) 16 g of O2(g) and 4 g of H2(g)

(ii) 16 g of O2 and 44 g of CO2

(iii) 28 g of N2 and 32 g of O2

(iv) 12 g of C(s) and 23 g of Na(s)

 

Answer:

Correct Answers: (iii) 28 g of N2 and 32 g of O2; (iv) 12 g of C(s) and 23 g of Na(s)

Explanation:

12 g of Calcium contains 1 mole of C

23 g of Sodium contains 1 mole of Na

28 g of Nitrogen contains 2 × 6.022× 1023 atoms of nitrogen

32 g of oxygen contains 2×6.022 × 1023 atoms of oxygen