Question

An ideal gaseous reaction (which is a hypothetical gaseous reaction that conforms to the laws governing gas behavior) occurs at a constant pressure of 50.0 atm and releases 55.9 kJ of heat. Before the reaction, the volume of the system was 9.00 L . After the reaction, the volume of the system was 3.00 L .

Answer 1

U    = q + W

q         = -55.9KJ   = -55900J

W     = -PV

          = -50*(3-9)

            = 300L-atm                      [1 L-atm = 101.3J]

             = 300*101.3J

             = 30390J

U    = q + W

          = -55900+30390    = -25510J   = -25.51KJ >>>>>answer

internal energy is released = -25.51KJ