How much thermal energy (in Joules) is in 1 liter of pure water at 71 degrees C?

The answer lies within heat capacity of water at that temperature and m. One gram is equal to one mL of water. if you multiply the m of the water (1000g) times the specific heat of the water (4.814J) times the temperature the water is at in Kelvins (344K), then you will have your answer, which is 1439296 joules, or 144 Kj/mol