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BIO Entropy Change from Digesting Fat. Digesting fat

University Physics | 13th Edition | ISBN: 9780321675460 | Authors: Hugh D. Young, Roger A. Freedman ISBN: 9780321675460 31

Solution for problem 39P Chapter 20

University Physics | 13th Edition

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University Physics | 13th Edition | ISBN: 9780321675460 | Authors: Hugh D. Young, Roger A. Freedman

University Physics | 13th Edition

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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?

Step-by-Step Solution:

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 80 % to metabolism Hence we get heat transferred as Q = 0.8 × 2.5 g × 9.3 × 4186 J Q = 77859.6 J

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Chapter 20, Problem 39P is Solved
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Textbook: University Physics
Edition: 13
Author: Hugh D. Young, Roger A. Freedman
ISBN: 9780321675460

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BIO Entropy Change from Digesting Fat. Digesting fat