Question

Calculate the number of particles in 17g of chlorine gas

Answer 1

Answer:

1.38506* 10^23 particles

Explanation:

By Formula Method

Given mass of Chlorine gas (Cl2) = 17g

Molar mass of Chlorine gas = 35.5*2 = 71g

n = m/M                                        ( n = number of moles )

=  17/71                                         ( m = Given mass )

=  0.23 moles                              ( M = Molar mass )

Number of Moles*Avogadro's number = Number of particles

= 0.23*6.022*10^23 = 1.38506* 10^23 particles

By Unitary Method

Molar mass of Chlorine gas = 35.5*2 = 71g

which means 71g = 1 mole of Cl2

= 71g = 6.022*10^23 particles

Number of particles in 1 g of Cl2 = 6.022*10^23/71

Number of particles in 17 g of Cl2 = 6.022*10^23/71*17

=  1.38506* 10^23 particles