One litre-atmosphere is equal to 101.3 J It can be explained as follows: 1 litre = 1 x 10−3m3 1 atmosphere pressure = 1.01 x 105 Pa 1 litre - atmosphere = 1 litre x 1 atmosphere = 1 x 10−3m3 x 1.013 x 105 Pa = 1.013 x 102Pam3 = 101.3 Pa m3 = 101.3 J (1 Pa m3 = 1 J) Hence option 'C' is correct.