Volume of Gas, Mass of Substance and Number of Particles

Figure below shows the relationship between the number of mole of particles in a substance with the mass, number of particles and volume of gas.



Example

Find the number of particle in 1200cm³ of nitrogen gas at room temperature. (Molar Gas Volume at r.t.p. = 24 dm³)

Answer:


Number of mole of nitrogen gas = 1200 cm 3 24000 cm 3 =0.05 mol

Number of nitrogen molecules = 0.05 mol × 6.0× 1 0 23 = 3.01 × 1 0 22