The mixture containing the same number of molecules as that of 14 g of CO is

GMW of CO = 28g28g of CO contain NA molecules14g of CO contain X moleculesWe know that GMW of any substance contain NA molecules.Thus 32g of O2 (or) 28g of N2 contain NA molecules1st option14g of Nitrogen + 16g of Oxygen 2nd option 3rd option14g of Nitrogen + 8g of Oxygen 4th option7g of  Nitrogen + 8g of oxygen 4th option is correct