Just before I delve into my question I'm just gonna say, I think my misunderstanding has to do with 1) the definition of a calorie and 2) how energy and temperature work together.
So, my textbook says that a calorie is how much energy one would need to raise the temperature of 1g of water 1°C (also 4.184 joules), is this not true?
BUT, it is also tells me a page later, in the context of heat of vaporization, that it takes 580 calories to evaporate 1g of water that is 25°C. From the definition of a calorie, wouldn't it be 75 calories to evaporate it? Also, the reason why they say this is to show water's high heat of vaporization due to hydrogen bonding, does it have to do with that?