Question

An electric bulb of volume 250 cc was sealed during manufacturing at a pressure of 10^-3 mm of mercury at 27°C. Compute the number of air molecules contained in the bulb. Avogadro constant = 6 x10²³ per mol, density of mercury = 13600 kg/m³ and g - 10 m/s² .

Answer 1

V = 250 cc = 250 × 10^–3
P = 10^–3 mm = 10^–3 × 10^–3 m = 10^–6 × 13600 × 10 pascal = 136 × 10^–3 pascal
T = 27°C = 300 K

No. of molecules