Quiz 1-solutions-6

# Quiz 1-solutions-6 - Version 310 – Quiz 1 – laude...

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Unformatted text preview: Version 310 – 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 P 2 P 1 = Δ H R 1 T 1- 1 T 2 Π = MRT Δ T b = iK b m Δ T f = iK f m P i = P ◦ i χ i P = i P i q = mc Δ T q = m Δ H 001 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. III, IV, V 2. I, II, III, IV, V 3. I, II and III correct 4. V 5. II, IV 6. I, III 7. III, V 8. III 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- culate the heat needed to convert 10 grams of water at 273 K to 10 grams of liquid water at 273 K. Finally, the heat capacity of water is necessary to calculate heat needed to raise the liquid water’s temperature from 273 K to 300 K. 002 5.0 points Consider a membrane, permeable to water but not sugar, which can withstand an os- motic pressure of 5 atm. If the osmotic pres- sure is currently just below the membrane’s...
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Quiz 1-solutions-6 - Version 310 – Quiz 1 – laude...

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