Steam can cause more serious burns than water at the same temperature. Here we e

Question

Steam can cause more serious burns than water at the same temperature. Here we examine this effect quantitatively, noting that flesh becomes badly damaged when its temperature reaches 50.0 degrees C.

Part A)
Calculate the heat released as 11.0g of liquid water at 100degrees C is cooled to 50.0degrees C .

Part B)
Calculate the heat released when 11.0g of steam at 100degrees C is condensed and cooled to 50.0degrees C .

Part C)
Find the mass of flesh that can be heated from 37.0 degrees C(normal body temperature) to 50.0degrees C for the case considered in part A. (The average specific heat of flesh is 3500J/kg K .)

Part D)
Find the mass of flesh that can be heated from 37.0degrees C (normal body temperature) to 50.0 degrees C for the case considered in part B. (The average specific heat of flesh is 3500J/kg K .)


*Please provide me with numerical answers, thank you*

Explanation / Answer

a) Q = m*c*?T = 0.011kg*4.186kJ/kg-oC*(100-50) = 2.3023kJ b) Now we have the same Q as a but with the addition of heat to condense the steam Q = m*Lv = 0.011kg*2.256x10^3kJ/kg = 24.816kJ so the total Q = 24.816 +2.3023 = 27.1183kJ c) a) Q = m*c*?T => m = Q/(c*?T) = 2302.3J/(3500*13) = 0.0506kg b) Q = m*c*?T => m = Q/(c*?T) = 27118.3J/(3500*13) = 0.596006593 kg

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