a. caculate the amount of heat (kcal) release when 50.0 g ofwater at 100 o C hit

Question

a. caculate the amount of heat (kcal) release when 50.0 g ofwater at 100oC hits the skin and cool to a bodytemperture of 370C. b. caluclate the amount of heat (kcal) releasedwhen 50.0 g ofsteam at 1000C hits the skin, condenses, and cools to abody temperture of 370C. a. caculate the amount of heat (kcal) release when 50.0 g ofwater at 100oC hits the skin and cool to a bodytemperture of 370C. b. caluclate the amount of heat (kcal) releasedwhen 50.0 g ofsteam at 1000C hits the skin, condenses, and cools to abody temperture of 370C.

Explanation / Answer

(a)      Heat released = Mass * specificheat * temperature difference                            =50.0 g * 1.00 cal/g * (100 - 37)                            =3150 calories                            =3.150 kcal (b)    First, the steam cools to water at 100C Heat released = Heat of vaporization * mass                      = 540 cal/ g * 50.0 g                       =27, 000 cal = 27 kcal Then it cools to 37 C releasing the same heat as calculateabove. So total heat released = 27 kcal + 3.150 kcal = 30.15kcal

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