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 E=f2mrT

     If only translational degree of freedom considered then

        f=3        ETrans=32mrT=32mRMT         =32×20×8.332×273+47          =2490 J

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