(1) Will you be estimating the gross energy or the physiologic energy value of a
ID: 531840 • Letter: #
Question
(1) Will you be estimating the gross energy or the physiologic energy value of a peanut when you do the calculations for this experiment? Briefly explain. (2) With which food label value will you compare your experimental result when calculating the percent difference in your determination of energy content? Briefly explain. A student followed the procedure of this experiment to determine the Caloric content of a Planter's cocktail peanut. The peanut studied had a mass of 0.609 g before combustion and 0.053 g after combustion. The energy released during combustion caused a 14.2 degree C increase in the temperature of 200.0 mL of water in the calorimeter. (1) Calculate the mass of peanut burned. 2) Calculate the mass, in kg, of water present in the calorimeter, using Equation 6. (3) Calculate the amount of energy released, in Cal, from the burning peanut. (4) calculate the amount of energy released per gram of peanut burned.Explanation / Answer
3(1)
We will be estimating the gross energy value of a peanut when we do the calculations for this experiment.
In this experiment we calculate T from the two temperatures (before and after burning of peanut)
We use the heat equation to solve for the amount of heat given off by the nut
qnut = m cT
c = specific heat of water = 4.18J/gC
m=mass of water
Then converting Joules to calories by dividing by 4.184
By definition Gross energy is the energy of complete combustion measured as determined using bomb calorimetry.
Physiological energy = Gross energy - the energy lost in fecal matter, urine, and combustible gases.
(2) With standard value for peanut or peanut butter label value we would compare our experimental result when calculating the percent difference in our determination of energy content.
After the peanut, is burned, some charcoal remains. Determine the mass of the remaining material. The mass of peanut, burned is equal to the initial mass of the peanut, minus the mass of the remaining material.
Divide this number by the mass of the nut to get the calories/gram for the nut. Compare this value to the accepted value for peanut.
Related Questions
Navigate
Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.