The kinetic energy of translation of 20 gm of oxygen at 47°C is (molecular wt. of oxygen is 32 gm/mol and R = 8.3 J/mol/K)

1.  2490 joules

2.  2490 ergs

3.  830 joules

4.  124.5 joules

1.  Kinetic energy for m gm gas $\mathrm{E}=\frac{\mathrm{f}}{2}\mathrm{mrT}$

If only translational degree of freedom considered then

Difficulty Level:

• 61%
• 14%
• 22%
• 5%