5.25 calories are absorbed by an iron nail. How many joules is this?

Answer 1

By definition, #"1 cal"# is the approximate amount of energy needed to raise the temperature of #"1 g"# of water by #1^@ "C"# at #"1 atm"#.

In thermochemistry, this is known to be equal to #"4.184 J"# at #25^@ "C"#. Therefore...

#5.25 cancel"cal" xx "4.184 J"/cancel"cal" = "21.97 J"#

Or to three sig figs, #~~# #ulcolor(blue)"22.0 J"#.

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Answer 2

Mateo Aguilar

To convert calories to joules, you can use the conversion factor: 1 calorie = 4.184 joules.

So, to find out how many joules are in 5.25 calories, you would multiply 5.25 by 4.184:

5.25 calories * 4.184 joules/calorie = 21.942 joules

Therefore, 5.25 calories is equivalent to approximately 21.942 joules.

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Answer from HIX Tutor

When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.