Question

If the density of nitrogen is 1.25 gL^-1 at NTP, then calculate the root mean square speed at 0°C and 20°C.

Answer 1

Volume of 1 mol of gas at NTP = 22.4 L and temperature T = 273 K,
Given: density of nitrogen,
P = 1.25 g L^-1
∴ Molecular mass of nitrogen M = PV
= 1.25gL^-1 × 22.4L = 28g
∴ Root mean square speed of gas at 0°C is