Example 1 - Volume of Gas, Mass of Substance and Number of Particles

Question:
A container contains 3.913 x 1023 methane molecules. What is the volume of the methane gas at r.t.p.? [Avogrado constant = 6.02 x 1023; Molar volume of gasses at r.t.p. = 24,000 cm3/mol]

Answer:
Number of mole of methane gas, n = 3.913 × 1 0 23 6.02× 10 23 =0.65 mol Volume of gas =0.65× 24000 cm 3 =15600  cm 3