How many joules are contained in a food containing 2.862 g of fat, 6.843 g of carbohydrates, and 5.635 g of protein? Use the following table in your calculations: 1 calorie = 4.1868 joules %3D Cal/g cal/g Protein 4 4000 Carbohydrates 4 4000 Fats 9. 9000

A piece of metal (mass = 43.4 g) at 135 ̊C is placed in a Styrofoam coffee cup containing 41.2 g of water at 25.0 ̊C.  When the metal and water reach equilibrium, the final temperature of the water is 39.8 ̊C. What is the specific heat of the metal to three decimal places. The specific heat of water = 4.18 J/g-C.

The nutritional calorie (Calorie) is equivalent to 1 kcal. One pound of body fat is equivalent to about 4.1 x 10³ Calories. If an athlete expends (1950 kJ/h), how long does it take her to work off 1.0 lb of body fat?

15.0 mL of a strong base is added to 15.0 mL of a strong acid in a coffee cup calorimeter. The temperature of the calorimeter contents rises from 22.5 °C to 24.5 °C.  Assume that: concentration of base = 0.500 M concentration of acid = 0.500 M the specific heat of the solution is 4.184 J/g°C the density of the solution is 1.00 g/mL the coffee cup does not absorb or release energy itself Calculate the ΔH for this neutralization reaction in kJ per mole of base.   Answer Options: A. –0.299 kJ/mol B. –33.5 kJ/mol C. –16.7 kJ/mol D. –0.502 kJ/mol