Question

How many Joules are in 2.5 kcal?

Answer 1

Remember that `"1 kcal"` `=` `"1 Cal"` `ne` `"1 cal"`, so this is the one where:

`"4.184 J"` `=` `"1 cal"`.

Therefore:

`=> "2.5" cancel("k")cancel("cal") xx (1000 cancel("cal"))/("1" cancel("k")cancel("cal")) xx "4.184 J"/(1 cancel"cal")`

`=` `color(blue)("10460 J")`