A serving of potato chips is crushed and burned in a clorimeter. the calorimeter has 2000 grams of water in it and the initail temperature is 21.0 degrees celsius. If the water's temperature increases to 29.0 degrees celsius, how many calories (kilocalories) are in the chips? I know that 1 calorie is 4.18 J. And i'm pretty sure you use the q=mcdeltaT formula.
2 answers
you have to convert the q(energy) that you find to calories.
Yes, you use mcdeltaT.
I wouldn't go through the 4.184 step since we know that the specific heat of water is 1 cal/g*C or 4.184 J/g*C.
This will give you calories and you divide by 1000 to obtain kcal BUT you call it BIG calories (or just calories or Calories---with a capital C) or some such word since the food business uses kcal = 1 cal. Some are trying to change that.
So 2000 x 1 x 8 = 16,000 cal = 16 kcal = 16 cal in the food business.
I wouldn't go through the 4.184 step since we know that the specific heat of water is 1 cal/g*C or 4.184 J/g*C.
This will give you calories and you divide by 1000 to obtain kcal BUT you call it BIG calories (or just calories or Calories---with a capital C) or some such word since the food business uses kcal = 1 cal. Some are trying to change that.
So 2000 x 1 x 8 = 16,000 cal = 16 kcal = 16 cal in the food business.