Question

(a) What is the average translational kinetic energy of a oxygen molecule at STP?

 (b) What is the total translational kinetic energy of 1.0 mol of molecules at 25°C?

Answer 1

a)The average transitional Kinetic energy is;

$K=\frac {3}{2}kT$

$=\frac {3}{2} (1.38×10^{-23}J/K) (273. 15K)$

$=5.65×10 ^{-21}J$

b) The total transitional Kinetic energy ;

$K=\frac {3}{2}kT$

$=\frac {3} {2} (1.0mol)(8.314J/mol. K) (273.15+25K)$

$=3.72×10^3J$