A 1.0 g sample of a cashew was burned in a calorimeter containing 1000. g of wat

Question

A 1.0 g sample of a cashew was burned in a calorimeter containing 1000. g of water, and the temperature of the water changed from 20.0 degree C to 25.0 degree C. In another experiment, a 3.0 g sample of a marshmallow was burned in a calorimeter containing 2000. g of water, and the temperature of the water changed from 25.0 degree C to 30.0 degree C. Based on the data, which of the following can be concluded about the energy content of 1.0 g of each of the two substances? (The specific heat of water is 4.2 J/(g degree C.) (A) The combustion of 1.0 g of cashew releases less energy than the combustion of 1.0 g of marshmallow. (B) The combustion of 1.0 g of cashew releases the same amount of energy as the^combustion of 1.0 g of marshmallow. (C) The combustion of 1.0 g of cashew releases more energy than the combustion of 1.0g of marshmallow. (D) No comparison can be made because the two systems started with different masses of food, different masses of water, and different initial temperatures.

Explanation / Answer

Exp1

m = 1 g sample of cashwe

m = 1000 g of water

dT = 25-20 = 5 ºC

Exp2

m = 3 g of marshmallow

m = 2000 g of water

dT = 30-25 = 5 ºC

NOTE there is the same change in temperature

From previous data

3 g = 2000 g,

1.5 g of marshmellows = 1000 g, same change

Therefore, we require MORE marshmellow to make the SAME effect as a cashwe

so

Choose C

The cashew will release more energy

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