## Essential University Physics: Volume 1 (3rd Edition)

$21.6\ MJ$
We find the mass that the water loses in three hours, recalling that 1L of water weighs 1 kg: $m = (3kg/h)(3h)=9kg$ We can now find Q: $Q = mL = (2.4MJ/kg)(9kg)=21.6\ MJ$