western michigan university
posted by lorena .
2.5grams of pecan nut was turned to heat up 100grams of water at 24 degrees Celsius. The final temperature after all the pecan oil in the nut was completely consumed was 70 degrees Celsius. Calculate the (a) energy released by the 2.5 gram pecan in calories and (b) the food calories present in 1gram of pecan.
Lorena -- Please learn the difference between a school subject and a school!!
There is a difference between turning and burning pecans.
The water heats up by 46 degrees due to the burning. Heat added to the water is 100*46 = 4600 calories or 4.6 "food" Calories. That is 1.8 food Calories per gram. That number is much too low.