Practice problem
Water boils at 100∘ C100^{\circ}\text{ C}100∘ C. If 1 liter of water is at 25∘ C25^{\circ}\text{ C}25∘ C, how much energy must be added to boil it?
75 calories
75 kilocalories
75 joules
75 kilowatt-hours
Type a concept, like “slope” or “photosynthesis”.