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5 March, 16:16

A patient arrives in the emergency room with a burn caused by steam. Calculate the heat that is released when 14.5 g of steam at 100. ∘C hits the skin, condenses, and cools to body temperature of 37.0 ∘C. (For water, 540 cal (2260 J) is needed to convert 1 g of water to vapor at 100 ∘C.)

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  1. 5 March, 18:58
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    Answer:36,592.1J or 36.5921KJ

    Explanation:

    first convert to steam

    14.5 g of steam at 100∘C

    To covert to water vaporor steam, becomes

    14.5g x 2260 J of energy per gram of steam

    =32,770J

    Also, Quantity of heat released when the temperature is reduced from 100 ∘C to 37 ∘C, we will use the formulae,

    q = m C ΔT

    Where specific heat capacity of water C = 4.184 J/g. C

    mass = 14.5g

    Change in temperature = 100∘C-37∘C = 63∘C

    we will now have

    = 14.5 g x 4.184 J/g. Cx (100 - 37) C = 3,822.084 J = 3822.1J

    Therefore total energy released = 32,770 J + 3822.1 J = 36,592.1J

    OR converting to KJ becomes=36,592.1/1000=36.592KJ
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