Burns produced by steam at 100 Burns produced by steam at 100degreeC are much mo

Question

Burns produced by steam at 100

Burns produced by steam at 100degreeC are much more severe than those produced by the same mass of 100degreeC water. To verify this: Calculate the heat that must be removed from 4.00 g of 100degreeC water to lower its temperature to 53.0degreeC. Calculate the heat that must be removed from 4.00 g of 100degreeC steam to condense it and lower its temperature to 53.0degreeC. Calculate the mass of human flesh that the heat produced in each case can raise from the normal 37.0degreeC to 53.0degreeC. (Flesh is badly damaged at 50.0degreeC.) steam

Explanation / Answer

the heat gained/lost is computed by

Q = m c delta T

where Q is the heat change, m is the mass of the sample, c is the specific heat, and delta T is the change in temp

for part a), m= 4g, c=1 cal/g/C, and delta T = 100-53=47

multiply out and get Q

for part b), you now add on to the Q of part a the amount of energy needed to condense water; the latent heat of vaporization is something like 540cal/g, so for 4 grams this is 540cal/g x 4g = 2160 cal in addition to your answer in a)

(check the value of the heat of vaporization of water; I think this is correct but you should verify it)

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