Haryana Police Constable Model Paper 2

● 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.