Find the number of moles of atoms present in 28 g of N atoms. (Gram atomic mass of N = 14 g)
Calculate the number of (a) Oxygen atoms in 0.10 mole of Na2CO3. 10H2O (b) gram atoms in 4.6 gram of sodium.
Number of atoms present in 52 g of helium is:
(NA is Avogadro’s constant Gram atomic mass of He is 4 g)