Question

Calculate the average molecular kinetic energy :

(a) per kilomole, (b) per kilogram, of oxygen at 27°C.

(R = 8320 J/k mole K, Avogadro's number = 6*03 x 10²⁶ molecules/K mole)

Answer 1

Given that

Temperature = 27°C = (273 + 27) K = 300 K

(a) `"Average kinetic energy per kilo mole" = 3/2RT`

     `=3/2xx 8320 J/K "mole" xx300 K`

    `=3.744 xx 10^6J` 

(b) `"Kinetic energy per kilogram"="Kinetic energy per kilo mole"/"Molecular weight"`

 `"Molecular weight of oxygen"= 32`

`"Kinetic energy per kilogram"=(3.744xx10^6 J)/32=0.117xx10^6 J`