Chapter 12, Problem 079 GO Print by: DARLENE PATRICK Taher 11 / ch12-hw *Chapter

Question

Chapter 12, Problem 079 GO Print by: DARLENE PATRICK Taher 11 / ch12-hw *Chapter 12, Problem 079 GO The temperature of 2.8 kg of water is 100.0°C, but the w pressure acting on the water surface is 3.5 x 105 Pa. Using the vapor pressure curve for wat given in the figure, determine the amount of heat that must be added to the water to bring it to the point where it just begins to boil. ater is not boiling, because the external 4 105 100 C 1.01 105 pa d 3 10 0.53 105 Pa 5 83 83 c 1.01 . I 0.53 105 0 50 50 83100 150 Temperature,c Number 1 Units Units the tolerance is +/2% Question Attempts: 0 of 2 us Copyright© 2000-2015 by John Wiley & Sons, Inc. or related companies. All rights reserved

Explanation / Answer

Amount of Water added Q = mcDT

from graph change temp of water corresponding to change of pressre is

DT = (150 -100 = 50 deg C

so

Q = 2.8 * 4186 * 50

Q = 5.86 *10^5 Joules

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