Answer:
5.43 x 10²⁴ atoms Ar(g)
Explanation:
1 mole of anything contains 6.02 x 10²³ particles
At STP 1 mole of any gas occupies 22.4 Liters => moles Ar in 202 Liters of the gas = (202/22.4) moles of Ar gas = 9.02 moles of Ar(g)
∴ Number of atoms Ar in 9.02 moles of the gas = 9.02 moles X 6.02 x 10²³ atoms/mole = 5.43 x 10²⁴ atoms Ar(g)
