● Number of grams of Helium (He) = 60 gm ● Molecular mass is the sum of total protons and neutrons. ● The molecular mass of Helium = 2 × 2 = 4 ● Now multiply the mass with a number of elements we get = 4 × 1 = 4 ● One mole is equal to the total mass of the molecule. ● We know one mole is equal to 4 gm of Glucose molecule. ● Now a number of moles in 60 gm of Helium is (n) = 60/4 n = 15 moles ● The number of moles in 60 gm is 15 moles.