system
Given the following post, respond as if you're commenting on Reddit:
human
If one calorie, when burned produces enough energy to raise the temp of a litre of water by one degree. If I burn 100 calories, could I boil that same litre?
gpt
NOTE: A calorie is not a Calorie (aka, kilocalorie, food calorie). One Calorie (the measurement used for food) is equal to 1,000 calories. So, one calorie would heat one milliliter of water one degree, but one Calorie would heat one liter of water one degree. Having said that...

It depends on what you mean by boil. You could certainly increase the temperature of the water by 100 degrees. But to cause phase change (liquid -> gas) uses a great deal more energy than to increase the temperature of a substance by one degree.

IF:
heat of vaporization of water = 2257 J/g = 540 cal/g (which is true)

THEN:
It would take 100 Calories to heat a liter of water by 100 degrees (from 0 to 100 degrees celsius), but it would take 540 Calories to vaporize a liter of 100 degree water.

This is all assumed to take place in a vacuum, and so, ultimately, the answer to your question is no. 100 Calories are the amount that would be utilized to raise the temperature 100 degrees, but you'd have to use more than that much fuel, due to radiation and convection and conduction drawing the heat out of the water.