Question

Calculate molecules in 1dm^3 of oxygen

Answer 1

Number of molecules in 1 dm³ Oxygen = 2.71 x 10²²

Further explanation

Conditions at T 0 ° C and P 1 atm are stated by STP (Standard Temperature and Pressure). At STP, Vm is 22.4 liters/mol.

The mole is the number of particles contained in a substance

1 mol = 6.02.10²³

1 dm³ of oxygen = 1 L Oxygen

• mol Oxygen :

$\tt \dfrac{1}{22.4}=0.045`mol$

• molecules of Oxygen :

n=mol=0.045

No = 6.02.10²³

$\tt N=n\times No\\\\N=0.045\times 6.02\times 10^{23}\\\\N=2.71\times 10^{22}$