If one slice of chocolate cake contains 35g of carbohydrate, 15g of fat and 5g of protein, calculate the kilocalories that each slice of cake contains.

how do I calculate kilocalories?

Question

If one slice of chocolate cake contains 35g of carbohydrate, 15g of fat and 5g of protein, calculate the kilocalories that each slice of cake contains.

how do I calculate kilocalories?

anonymous · Answer

1 kilocalorie = 4184 joules

anonymous · Answer

so how do I determine what the kilocalorie for each slice of cake is?  Looking for the formula?

anonymous · Answer

you have data for one slice of cake now calculate combustion energy of every substance and then turn it in kilocalories

btaylor · Answer

For carbohydrates and proteins, there are 4 kilocalories per gram. For fat, there are 9 kilocalories per gram. So 35(4)+15(9)+5(4) = 295 kilocalories per slice.
Sorry, Kryten, but your way won't work because you don't know which hydrocarbons, fats, or proteins are combusted.

anonymous · Answer

yes that was a bit strange to me too but i didnt know energy values for fat and carbohydrates... but i know how energy value is usually determined.

anonymous · Answer

Thank you both for your help.  I was trying to make the problem much more complicated.  I've got it now with your help, so thanks!