Which of the following pairs have the same number of atoms ?
(a) 16 g of O2(g) and 4 g of H2(g)
(b) 16 g of O2 and 44 g of CO2
(c) 28 g of N2 and 32 g of O2
(d) 12 g of C(x) and 23 g of Na(s)
16 g of oxygen has same number of molecules as in
(a) 16 g of CO (b) 28 g of N2 (c) 14 g of N2 (d) 1.0 g of H2