Question

(Chemistry Nutritional Value Problem) Tell me if I'm correct? Q: Determine if a person can eat a piece of chocolate cake that contains 16g of carbohydrate, 9g of fat, and 11g of protein if that person is on a diet that restricts food choices to foods that have less than 25% of calories from fat.

What I did:
(using 4-9-4 rule) 9g fat * 9kcal/g = 81kcal
Then converted 81kcal to cal, which is 81,000cal.
Then I turned that into a percent, which is 810%

So, if that is the correct answer, then the person shouldn't eat it, right? I just feel that 810% is a little high for some reason... Am I missing something?

Answer 1

hahaaa are u taking a pre-med class??? they are all on medicine n nutriution!!!

u are going WAY too complicated in ur calc though. Simple way - how many gram of food he would eat?

Answer 2

Hi again :D No, I'm just taking a college chemistry class. It's a prerequisite I need to get into a Radiology program. I am terrible at word problems, though!

36 grams

Answer 3

n how much of that is fat?

Answer 4

9g

Answer 5

so the % of fat is...

Answer 6

0.09%?

Answer 7

Oh crap....its 25% of calories....not by weight :(

Answer 8

Yeah ; _;

Answer 9

do they all have the same calories content - fat, carbs n proteins? or that is the 4-9-4 ratio u mentioned?

Answer 10

carbs and proteins are multiplied by 4kcal over 1g and fats are multiplied by 9kcal over 1g.

Answer 11

Then yes, u need to calculate the total cal intake....so 9g fat n 9kcal/g right? wats the cal from fat?

Answer 12

81kcal. And if you need that to be converted to cal, it's 81000cal.

Answer 13

noooooooo keep the zero out of here lol

ok can u repeat the cal for carbs n proteins plz?

Answer 14

There's 64kcal for carbs and 44kcal for protein.
Fats, carbs, and proteins together is 189kcal.

Answer 15

soooooo wats the next step?

Answer 16

Somehow I have to find the percentage of fat from the total. I'm blanking out on how to, though o .o;

Answer 17

calories from fat = ?
total calories = ?

Answer 18

Oh! Okay calories from fat 81kcal
Total calories is 189kcal.
Then divide them maybe? 0.43 (rounded to 2 significant figures)

Answer 19

x100% to get the percentage :)

Answer 20

43%
*tears of joy*
Thanks :)

Answer 21

I appreciate your patience ^_^

Answer 22

welcome hehe u did most of the work urself :P