CU CHM 203 - Quiz six General Chemistry I (3 pages)

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Quiz six General Chemistry I



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Quiz six General Chemistry I

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Pages:
3
School:
Creighton University
Course:
Chm 203 - General Chemistry I
General Chemistry I Documents

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Q U IZ S I X Quiz 50 CHM 203 D R M AT TSO N A 46 5 B 43 5 B 41 0 C 37 5 C 34 00 D 30 00 2 D ECEM BE R 2003 Name Instr ucti on s Show all work whenever a calculation is required You will receive credit for how you worked each problem as well as for the correct answer This exam is worth 50 points but the questions total 55 points You may skip 5 points or attempt all questions Your score will be determined by subtracting the number missed from 55 Scores greater than 50 will be recorded as 50 BOX YOUR ANSWERS 1 4 pts An open end manometer containing a sample of gas in the bulb and open to an external pressure of 790 mmHg It the level of mercury in the arm connected to the bulb is 14 5 cm higher than the level of mercury in the arm open to the atmosphere what is the pressure inside the bulb 4 5 pts Suppose a sample of argon occupies 550 mL at 300 K and 2 5 atm pressure What is the volume of the gas at STP Show work Show work 5 5 pts What is the density of carbon dioxide at 2 4 pts At what temperature would 4 00 g nitrogen gas occupy 5 00 L at 795 0 mmHg Show work STP Derive the needed formula starting with PV nRT and show your work Show work 3 5 pts What is the MM of a gas with a density of 2 99 g L at 25 oC and 744 mmHg Derive the needed formula starting with PV nRT and show your work Show work 6 4 pts Calculate the relative rates of effusion for CH4 g and SF6 g uCH4 uSF6 Show work 8 4 pts Calculate the amount of heat required to convert a 450 g ice cube at 22oC to water at 35oC Possibly useful information Specific heats H2O s 2 10 J g deg H2O l 4 18 J g deg H2O g 1 80 J g deg Hvap 40 7 kJ mol Hfus 6 0 kJ mol Show work 9 6 pts Phase diagrams for two substances are given below Answer the following questions about Substances A and B Substance A 2 0 Pressure atm Pressure atm 8 Substance B 1 5 6 4 1 0 0 5 2 50 100 150 200 250 Temperature Celcius 25 50 75 100 125 Temperature Celcius a What is the phase of Substance B at 50 oC and 1 5 atm b What phase change is Substance A 10



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