4. The heat of vaporization of a liquid may be obtained from the approximated integrated form of the Clausius-Clappeyron equation In (P2/P) T,T2 P2 AH, = -R- = R -In- 1/T, - 1/T, T2 - T,P For water, the vapor pressure is measured to be 9.2 Torr at 10.0°C (283.15K) and 55.3 Torr at 40.0°C (313.15K). Taking R to be 8.3145 JK' mol', calculate AHvap. Taking the limit of error (95% confidence) in the temperature measurement to be 0.1K and that in the pressure measurements to be 0.1 Torr, calculate the uncertainty in AHvap. A literature source gives 43,893 J/mol for AHvap at 25°C. Is the difference between this value and your value significant at the 95% confidence level?

4. The heat of vaporization of a liquid may be obtained from the approximated integrated form of the Clausius-Clappeyron equation In (P2/P) T,T2 P2 AH, = -R- = R -In- 1/T, - 1/T, T2 - T,P For water, the vapor pressure is measured to be 9.2 Torr at 10.0°C (283.15K) and 55.3 Torr at 40.0°C (313.15K). Taking R to be 8.3145 JK' mol', calculate AHvap. Taking the limit of error (95% confidence) in the temperature measurement to be 0.1K and that in the pressure measurements to be 0.1 Torr, calculate the uncertainty in AHvap. A literature source gives 43,893 J/mol for AHvap at 25°C. Is the difference between this value and your value significant at the 95% confidence level?

Chemistry

10th Edition

ISBN:9781305957404

Author:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste

Publisher:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste

Chapter1: Chemical Foundations

Section: Chapter Questions

Problem 1RQ: Define and explain the differences between the following terms. a. law and theory b. theory and...

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Question

4. The heat of vaporization of a liquid may be obtained from the approximated integrated form
of the Clausius-Clappeyron equation
In (P2/P,)
1/T,- 1/T,
T,T2
T2 - T, P
P2
AH, = -R-
= R
-In-
For water, the vapor pressure is measured to be 9.2 Torr at 10.0°C (283.15K) and 55.3 Torr at
40.0°C (313.15K). Taking R to be 8.3145 JK' mol', calculate AHvap. Taking the limit of error
(95% confidence) in the temperature measurement to be 0.1K and that in the pressure
measurements to be 0.1 Torr, calculate the uncertainty in AHvap. A literature source gives
43,893 J/mol for AHvap at 25°C. Is the difference between this value and your value significant
at the 95% confidence level?

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Hypergolic propellants are fuels and oxidizers which ignite spontaneously on contact with each other.requiring no ignition source, hypergolics are ideal for spacecraft maneuvering systems as they provide an easy start and restart capability. Also, hypergolics do not pose the storage problems of cryogenic propellants (e.g., liquid oxygen and hydrogen) as they remain liquid at normal temperatures. This technology was used on the Apollo 11 Mission 40+ years ago. As part of the testing for a new thruster design, amounts of unsymmetrical dimethyl hydrazine, or UDMH [(CH3)2N-NH2; MW=60.1 g/mol] were reacted with dinitrogen tetroxide [N2O4; MW=92.1 g/mol]. The balanced equation for this reaction is shown below: (CH3)2NNH2(l) + 2 N2O4(g) → 3 N2(g) + 4 H2O(g) + 2 CO2(g) For one test, 721.2 grams of UDMH was completely consumed. How much dinitrogen tetroxide [in grams] was needed?