Question

A patient arrives in the emergency room with a burn caused by steam. Calculate the heat that is released when 13.3 g
g
of steam at 100. ∘C
∘
C
hits the skin, condenses, and cools to body temperature of 37.0 ∘C
∘
C
. (For water, 540 cal
c
a
l
(2260 J
J
) is needed to convert 1 g
g
of water to vapor at 100 ∘C
∘
C
.)

Answer 1

The heat released from the calculation is 33.56 kJ.

Heat of vaporization

The heat of vaporization is the heat absorbed when a substance changes from liquid to vapor. It is equal to the heat released when the vapor is condensed.

The total heat released = Heat of condensation + Heat lost to the skin

=  (13.3 g × 2260 J/g) + (13.3 g × 4.18 J/g/°C  × ( 100 - 37)°C)

= 30058 + 3502

= 33.56 kJ

The heat released from the calculation is 33.56 kJ.

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