An engine takes in 5 moles of air at 20oC and 1 atm, and compresses it adiabaticaly to 1/10th of the orginal volume. Assuming air to be a diatomic ideal gas made up of rigid molecules, the change in its internal energy during this process comes out to be X kj. The value of X to the nearest integer is __________
Option: 1 11
Option: 2 46
Option: 3 35
Option: 4 28
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