A gas absorbs 100 J of heat and is simultaneously compressed by a constant external pressure of 1.50 atmospheres from a volume of 8 L to 2 L. ∆E will be

∆H=100 JWork done P∆V=1.5-6. Now, this work done is in litre atmospheres. To obtain the same in joules, multiply by 8.314 and divide by 0.0821∴   ∆H=∆E+ P∆V or, 100 =∆E+ 1.5-60.0821×8.314 or,   ∆E = 1011.4 J