Extend your thinking: In addition to calculating specific heat capacities, some calorimeters can be used to determine how much energy is in food. The energy in food is usually expressed in calories or kilocalories (Calories). A calorie is the amount of energy needed to change the temperature of 1 g of water by 1 C. There are 1,000 calories in a Calorie.
A. How many joules are in 1 calorie? (The specific heat of water is 4.184 J/g °C.)
B. Suppose a snack bar is burned in a calorimeter and heats 2,000 g water by 20 °C. How much heat energy was released? (Hint: Use the specific heat equation.) Give your answer in both joules and calories.
C. How many kilocalories (Calories) does the snack bar contain?

We know that m = 2000 g, ΔT = 20 (because we are told that it heats the water by 20 °C), c = 4.184 (because we are calculating it for water).

So, q = 2000 · 4.184 · 20 = 167360.

C. This answer makes sense because when you divide it by 1000 to get the Calories (what we use in real life), you get 167.36 which seems normal for a snack bar.

Hope this helps.

tutorareej tutorareej · Answer 2 · 2021-10-16T08:03:14+02:00

(A) There are 4.184 J/g in 1 calorie.

(B) 167.36 kJ/ gram heat was released on burning the snack bar.

(C) The snack bar consists of 40 kilocalories.

(A) The conversion of calories to joules has been taking specific heat of the water as standard.

1 calorie = 4.184 J/g

(B) Specific heat (q) = mc[tex]\Delta[/tex] t

Where, m = mass

C = specific heat capacity

[tex]\Delta[/tex]t = change in temperature

For burning of 2000 g of snack by 20 degrees:

q = 2000 [tex]\times[/tex] 4.184 [tex]\times[/tex] 20

q = 167360 Joules\gram

q = 167.36 kJ\gram

(C) 4.184 J\gram = 1 calorie

167360 J/gram = 40,000 calorie

1000 calorie = 1 kilocalories

40,000 calorie = 40 kilocalories.

For more information about specific heat, please refer the link:

https://brainly.com/question/11297584?referrer=searchResults