Will Maynez burns a 0.6-g peanut beneath 50 g of water, which increases in temperature from 22°C to 50°C. (The specific heat capacity of water is 1.0 cal/g · °C.)
a. Assuming that 40% of the heat released by the burning peanut makes its way to the water (40% efficiency), show that the peanut's food value is 3500 calories (equivalently, 3.5 Calories).
b. Then show how the food value in calories per gram is 5.8 kcal/g (or 5.8 Cal/g).