Question

(a)Find out the number of moles in 52g of He ,20g of H2O​

Answer 1

Answer:

no. of moles = given mass / molar mass

n= m/M

a) 52g of He

Molar mass of He is 4

n = 52/4

n = 13 moles

b) 20g of water

Molar mass of H is 1

Molar mass of O is 16

Molar mass of H2O is 2(1) + 16 = 18

n = 20/18

n = 1.11 moles = 1 mole