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Solved: BIO Entropy Change from Digesting Fat. Digesting
Chapter 20, Problem 39P(choose chapter or problem)
Problem 39P
BIO Entropy Change from Digesting Fat. Digesting fat produces 9.3 food calories per gram of fat, and typically 80% of this energy goes to heat when metabolized. (One food calorie is 1000 calories and therefore equals 4186 J.) The body then moves all this heat to the surface by a combination of thermal conductivity and motion of the blood. The internal temperature of the body (where digestion occurs) is normally 37°C, and the surface is usually about 30°C. By how much do the digestion and metabolism of a 2.50-g pat of butter change your body’s entropy? Does it increase or decrease?
Questions & Answers
QUESTION:
Problem 39P
BIO Entropy Change from Digesting Fat. Digesting fat produces 9.3 food calories per gram of fat, and typically 80% of this energy goes to heat when metabolized. (One food calorie is 1000 calories and therefore equals 4186 J.) The body then moves all this heat to the surface by a combination of thermal conductivity and motion of the blood. The internal temperature of the body (where digestion occurs) is normally 37°C, and the surface is usually about 30°C. By how much do the digestion and metabolism of a 2.50-g pat of butter change your body’s entropy? Does it increase or decrease?
ANSWER:Solution 39P
Step 1:
In this question, we need to find the change in entropy and also check if the entropy decreases or increases
One food calorie = 1000 calories or 4186 J
Heat transferred to body by digestion of 2.5 g fat is
We have 9.3 food calories per gram of fat
Hence we get heat transferred as