<p>An engine takes in 5 moles of air at <span class="equation">\(20^oC \)</span>​​​​​​​and 1 atm, and compresses it adiabatically to 1/10th&nbsp;of the original 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________.</p>