chemical engineering *An adult human being at rest produces roughly 0.40 mJ/h of thermal energy through metabolic...

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Chemistry

chemical engineering
*An adult human being at rest produces roughly 0.40 mJ/h of thermalenergy through metabolic activity. Use that fact to solve thefollowing problems.
(a)
A college student who weighs 128 pounds put off a major assignmentuntil the day before it was due and worked for eight hours tocomplete it. If she is modeled as a closed adiabatic system atconstant pressure, her heat capacity and molecular weight areapproximately the same as that of liquid water, and her temperaturewas normal when she began to work, what would her temperature havebeen by the time the assignment was finished?
(b)
Now model the student as an open system and assume that evaporationof perspiration (evaporative cooling) is the only mechanism forheat loss. How much weight would she have lost through evaporationif she maintained a constant body temperature?
(c)
Are either of the models in Parts a and b reasonable? Explain. Whatis the most likely explanation of what happened to the metabolicenergy produced in her body?

Answer & Explanation Solved by verified expert

3.8 Ratings (566 Votes)

A We know that q mc t Now q 040mJhour 8 hours 32 103 J m 5805 103 g c 418 Jgc therefore t qmc t 0013106 Therefore the final temperature will be 37 0013106 c Assuming normal body temperature 37c b q mc t Q 32 103 J C 418 Jgc See Answer

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