Burns produced by steam at 100°C are much more severe than those produced by the

Question

Burns produced by steam at 100°C are much more severe than those produced by the same mass of 100°C water. To verify this:

(a) Calculate the heat that must be removed from 6.00 g of 100°C water to lower its temperature to 45.0°C. _______ kcal

(b) Calculate the heat that must be removed from 6.00 g of 100°C steam to condense it and lower its temperature to45.0°C. ________kcal

(c) Calculate the mass of human flesh that the heat produced in each case can raise from the normal 37.0°C to 45.0°C. (Flesh is badly damaged at 50.0°C.)

steam: _________ kg

water: _________ kg

Explanation / Answer

a) Q = mwatercwater T = 0.006*1*(100 – 45) = 0.33 kcal

b) Q = mLv + msteamcsteamT = 0.006*539.4 + 0.006*1*(100 – 45) = 3.57kcal

c) For steam,

Q = mfleshcfleshT

3.57*10^3 = mflesh*0.829*(45-37) = 538.3 g

For water,

Q = mfleshcfleshT

0.33= mflesh*0.829*(45-37) = 0.05 g

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