A gas mixture consists of molecules of tyres A, B, and C with masses mA > mB > mC. Rank the three types of molecules in decreasing order of a) average KE b) rms speeds
vav=vˉ=πm8KBT=πm8RT=πm8PV In this question. As the temperature and pressure are same vav=bar{v}∝m1 vC>vB>vA as KE∝v2;KE∝m So, u will affect the KE more than mass of atom So, KE of molecules in decreasing order is KEC>KEB>KEA (b) Similarly the vrms=m3KBT P,T are constant arms∝m1 mA>mB>mC (given) (vrms)C>(vrms)B>(vrms)A
