Compute the root-mean-square speed of At molecules in a sample of argon gas at a temperature of 72 C

Answer 1

u_rms = sqrt 3RT/M

R = constant = 8.314 kg/m²/sec²

T = temp in K = 72 + 273 = 345K

M = molar mass in kg = 39.95 g/mol x 1 kg/1000 g = 0.03995 kg

u_rms = sqrt (3)(8.314)(345)/0.03995 = sqrt 215,394

u_rms = 464 m/sec