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 54.0°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 to 54.0°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 54.0°C. (Flesh is badly damaged at 50.0°C.) steam kg water kg

Explanation / Answer

a) Q = m x C x deltaT

Q = 6.00 g * 4.18 J/mol*K * (100 - 54) = 1153.7 J

b) the heat of vaporization of water is 2260 J/g,
so Q = 2260 J/g * 6.00 g * (100 - 54) = 623.8 k J
total Q = 623.8 kJ + 1.154 kJ = 624.9 kJ

c) 624.9 kJ * (54 -34 ) = 12498 kJ

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