Question

a bottle of liquid acetone is converted to a gas at 75.0 C. if 628 J are required to raise the temperature of the liquid to the boiling point, 15.600 kJ are required to evaporate the liquid, and 712 J are required to raise the final temperature to 75.0 C, what is the total energy required for the conversion?

Answer 1

Process                                                          energy required

1) raise the temperature to 75.0 °C                628 J

2) evaporate the liquid at 75.0°C                    15.6 KJ = 15,600 J

3) raise the temperature to ?                           712 J

Total energy: 628 J + 15,600 J + 712 J = 16,940 J

As you must have realized the clue to do the problem correctly is to convert all the energy values to joules, because you cant not add up joules with kilo joules.

Answer: 16,940 J