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.)

Question

Bentley Andrews

Chemistry

9 October, 18:33

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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Answers (1)

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Jaylee Mercado · Answer 1

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