Not a suicide , unfortunately , so your entry has been denied . <| sep |> When I was young , I had a fear we ' d move to a foreign country and the rest of my family would learn the native language but I wouldn ' t do they ' d be speaking a different language than me <| sep |> Who is talking about millions of years ago ? In the 70 ' s the situation was global cooling . 1970 sglobalcoolingalarmism . htmlAnd now it ' s the the same alarmism but with the warming trend . <| sep |> Welcome in Montreal , be sure to try one of our gaming pubs ! <| sep |> I did the math , $ 30 each <| sep |> So one thing that jumps out at me is that you have a constant pressure , isothermal expansion , which isn ' t possible . Are you sure that the problem doesn ' t say constant external pressure expansion ? Then your equation dH 0 is correct , because the pressure of the system does change . Based on your comments I ' m assuming you ' re considering an ideal gas