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Quiz 1-solutions-1

Quiz 1-solutions-1 - Version 367 – Quiz 1 – laude...

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Unformatted text preview: Version 367 – Quiz 1 – laude – (51635) 1 This print-out should have 8 questions. Multiple-choice questions may continue on the next column or page – find all choices before answering. Constants R = 8 . 314 J · K − 1 · mol − 1 Equations ln parenleftbigg P 2 P 1 parenrightbigg = Δ H R parenleftbigg 1 T 1- 1 T 2 parenrightbigg Π = MRT Δ T b = iK b m Δ T f = iK f m P i = P ◦ i χ i P = summationdisplay i P i q = mc Δ T q = m Δ H 001 5.0 points Determine whether carbon dioxide is a solid, a liquid, gas, or supercritical fluid at each of the following combinations of temper- ature and pressure (use phase diagram pro- vided): I) 10 bar, 275 K II) 1000 bar, 200 K Carbon Dioxide 3 1 4 2 200 250 300 350 400 10 10 1 10 2 10 3 10 4 Pressure,bar Temperature, K 1. gas, liquid 2. gas, solid correct 3. supercritical fluid, solid 4. solid, gas Explanation: 002 5.0 points Assuming standard pressure, what physical constants are needed to calculate the change in enthalpy for raising a sample of water from 250 K to 300 K. I) the heat capacity of ice II) the enthalpy of fusion of water III) the heat capacity of water IV) the enthalpy of vaporization of water V) the heat capacity of steam 1. II, IV 2. I, III 3. III, IV, V 4. V 5. III 6. I, II, III, IV, V 7. III, V 8. I, II and III correct Explanation: The heat capacity of ice is necessary to calculate heat needed to raise the liquid wa- ter’s temperature from 250 K to 273 K. The enthalpy of fusion of water is necessary to cal-...
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Quiz 1-solutions-1 - Version 367 – Quiz 1 – laude...

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