PHY7AW10practice-q7

# PHY7AW10practice-q7 - 3 Two substances one a gas and the...

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1. Add to the attached graph the appropriate curves for a second substance with the following properties: 50 atoms, E b = -350 x 10 -21 J, T(s l)=75K, | Δ H(s l)|=50 x 10 -21 J, T(l g)=200K, | Δ H(l g)|=200 x 10 -21 J. This second substance forms a diatomic gas with its vibrational modes frozen out. Draw your graph as accurately as possible by calculating points first. Label clearly. 7A 2C Quiz 7 DL Sec. ____ Name _____________________ __________________ last first for office use only I certify by my signature that I will abide by the code of academic conduct of the University of California. Signature _____________________________ Formulas: Eth/mode = (1/2)k B T; C = Q/ Δ T = (1/2)k B (#modes)(#atoms); k B = 1.38 x 10 -23 J/K

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2. How many atoms comprise the sample whose properties are plotted in the attached graph, and how do you know this? Refer to the attached graph, and note that it is not the same as the one from problem 1.
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Unformatted text preview: 3. Two substances, one a gas and the other a liquid, are initially at the same temperature, but are contained in two sepa-rate, rigid, thermally insulated containers. If 1.7 kJ of energy is added to each container, will the change in the ther-mal energy for the gas be greater than, equal to or less than the change in Eth for the liquid? The addition of this en-ergy does not cause a phase change in either substance. If you think you don’t have sufficient information to answer, what specific additional information would you need? 7A 2C Quiz 7 DL Sec. ____ Name ________________________ __________________ last first Formulas: Eth/mode = (1/2)k B T; C = Q/ Δ T = (1/2)k B (#modes)(#atoms); k B = 1.38 x 10-23 J/K...
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PHY7AW10practice-q7 - 3 Two substances one a gas and the...

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