... 2 ∆H = - 39, 240 - 25.9 x 24 - 11,780 - 23.7 x 70 - 29 .4 x 94 - 296,900 + 41 .9 x 94 J/mol392 = - 349 .0 kJ/mol Note that temperature differences can be found without conversion to the Kelvin ... ethylene, C H , to form2 4 cyclobutane, C H , would not readily occur quantitatively under conditions conducive to 4 8measurement of the heat of reaction. But both ethylene and cyclobutane can be burned ... aftermixing?There is no energy advantage for the yellow grains to move to the bottom, or back to thetop, or to any other specific location. We know that, once mixed, there is close to zero(1) TQSrev=∆...