At an altitude of ( 15 mathrm{~km} ) the temperature is ( 217 mathrm{~K} ) and the pressure ( 12.1 mathrm{kPa} ). What is the mean speed of ( mathrm{N}_{2} ) molecules, in ( mathrm{m} mathrm{s}^{-1} ), at this altitude? A. 405 B. 504 C. 204 D. 304

At an altitude of 15km the temperature is 217K and the pressure 12.1kPa. What is the mean speed of N2 molecules, in ms1, at this altitude? A. 405 B. 504 c. 204 D. 304