8 In the combustion of octane the chemical energy holding th

8. In the combustion of octane, the chemical energy holding the hydrocarbon is released, ) usually explosively, as shown in the balanced equation below: 2C8H 18 (l) + 2502(g) - 16 CO2 (g) + 18 H2O(g) If the engine compartment starts off at 25°C and ends at 110°C, and the combustion of 16.0 mol of octane released 298kJ, what is the net energy change in the vehicle\'s area -engine, cab, and air? a. 0 kJ b. -292 kJ c. +292 kJ d. -303 kJ

Solution

The combustion releases energy which converts to kinetic energy of vehicle and due to thermal loss raises temperature of surrounding.

But net energy change of system will be 0KJ as neither energy is created or destroyed.