The high heat of vaporization of water is what makes steam dangerous. Determine
ID: 996085 • Letter: T
Question
The high heat of vaporization of water is what makes steam dangerous. Determine the amount of boiling water if spilled over your skin surface could produce the same amount of heat exposed by 5 gm of steam at the same surface. Assume the skin raises its surface temperature to 35degree C at thermal equilibrium in both cases. Show your detail calculations. (L_iCC=80 Cal/gm; L_steam=538 Cal/gm; C_Watcr=1 Cal/gm-K) Assume a 1 gm of frozen ice at 0degree C is mixed with 5 gm of culture mammalian cells at 25degree C in an isolated system during an in-vitro experimentation. Subsequently 1 gm of steam was further exposed to the above mixture in the experiment. Determine the total mass and final temperature of the product of the mixture at thermodynamic equilibrium taking approximation of the cytoplasmic cell composition to water.Explanation / Answer
Esteam = 5gx 538cal/g = 2690cal as E water = Esteam E water = mwater x C x T =) mwater = E water /CT
mwater = 2690cal/ /1cal/g K x (273+35)K) = 8.73g
mwater = 8.73g
b) ice absorb heat of cell for ende E1 = 1gx 80cal/g = 80cal and E2 = 1gx 538cal = 538cal
now the cell composition is wate so than we can think than it have a m so big than the T no change
E1 = mcT =) m = E1/cT = 80cal/(1cal/g x (20+273)K ) = 0.27g the energy than loss the cell = Ec10 - 0.27gx80cal/g and Ec10 = 0.27gx1cal/g x (20 + 273 )
Ec1 = 0.27gx1cal/g x (20 + 273 ) -0.27gx80cal/g = 79.11cal - 21.6cal = 57.51
T = Ec1/cm = 57.51cal /0.27cal/K = 233K = 60C
Ec2 = Ec1 + E2 = 79.11cal + 538cal the mas of sisten = 617.11cal
m = E2/cT = 617.11cal/293k cal/g = 2.11g of water
and the T of this m is T = Ec1/cm = 617.11cal /2.11cal/K = 308.5k = 35.5C
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