***40 ! *** using the equations and enthalpy values provided, which mathematical expression can be used to determine the unknown enthalpy change represented by x? 3c + 3o2 yields 3co2 deltah = x 4h2 + 2o2 yields 4h2o deltah = - 1144 kj c3h8 + 5o2 yields 3co2 + 4h2o deltah = -2222 kj c3h8 yields 3c + 4h2 deltah = 104 kj 104 = (-2222) - [x - (-1144)] 104 = (-2222) - [x + (-1144)] < correct 104 = (-2222) + [(-1144) - x] 104 = (-2222) - [(-1144) - x]