Chemistry
posted by Jason on .
A 0.25g sample of a pretzel is burned. The heat it gives of is used to heat 50.g of water from 18 to 42 degrees C. what is the caloric value of the pretzel in kcal/g?
Can someone walk me through step by step?

I don't know if this is a nutrition course or not. Sometimes we don't know if a Cal is a kcal or not. I will assume the question deals with 1 cal = 4.184 J.
q = mass water x specific heat water x delta T.
q = 50 x 1 cal/g x (4218) = 1,200 calories.
Then 1,200/0.25 = 4,800 calories = 4.8 kcal/g 
write out the steps