Points are routinely deducted for missing labels on number answers, or for failure to observe significant figures. Pleas

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Points Are Routinely Deducted For Missing Labels On Number Answers Or For Failure To Observe Significant Figures Pleas 1 (74.4 KiB) Viewed 13 times

Points Are Routinely Deducted For Missing Labels On Number Answers Or For Failure To Observe Significant Figures Pleas 2 (66.02 KiB) Viewed 13 times

Points Are Routinely Deducted For Missing Labels On Number Answers Or For Failure To Observe Significant Figures Pleas 3 (99.51 KiB) Viewed 13 times

Points are routinely deducted for missing labels on number answers, or for failure to observe significant figures. Please ask me for help to do a great job. 1. (20 pt) How much heat is needed to convert 1.0 kg (= ?? g) of ice at 0 °C completely into steam at 100 °C. For water, AHvap = 40.79 kJ/mol, AHfus = 6.01 kJ/mol, and the specific heat of water is 4.184 J/g °C. Draw a labeled heating curve; and remember to keep everything in kJ. Thwew quill bw 3 q's. [Ans: 3020 or 3.02 * 10³] 2. (5 pt) The enthalpies of vaporization of H₂S and H₂Se are 18.7 and 23.2 kJ/mol, respectively. Why is the AHvap of water (40.6 kJ/mol) so much higher that the values for H₂S and H₂Se?
3. (20 pt) When silver crystallizes, it forms face-centered cubic cells. The unit cell edge length is 408.7 pm. a. How many silver atoms are in the unit crystal? b. Calculate the volume in cm³ of the unit crystal. c. Calculate the mass of the crystal. d. Calculate the density of silver in g/cm³. [Ans: about 11] 4. (5 pt) Distinguish between the boiling point of a liquid and the normal boiling point of a liquid. You may need to look this up in your book. Please answer in complete sentences. 5. (20 pt) Clausius-Clapeyron: The vapor pressure of mercury is 17.3 mmHg at 200 °C. What is the vapor pressure at 300 °C, if its molar heat of vaporization is 59.0 kJ/mol? (Remember to have R in units of kJ) [Ans: 236]. 6. (5 pt) In the following pairs, indicate which member would have the higher heat of vaporization? You should figure this out conceptually. Do not look up number values. a. He or Kr b. CH₂OH or CHIOCH;
7. (20 pt) Given the following data for N₂, draw and label a heating curve and calculate how much energy in kilojoules is required to convert 1000g of N₂ at -206 °C to N₂ gas at 20 °C. (You will not need to use moles in this problem.) [Ans: 436] Normal melting point Normal boiling point Heat of fusion Heat of vaporization Specific heat of liquid Specific heat of gas Specific heat of solid -210 °C -196 °C 25 J/g 200 J/g 2.0 J/g °C 1.0 J/g °C 1.6 J/g °C Note: these numbers would be very different for water! 8. (5 pt) Consider a steel cylinder containing 20 kg of CO₂ in the form of liquid and gas. The valve is opened and CO₂ flows rapidly from the cylinder, just as when you open a bottle of soda the CO₂ escapes rapidly. Soon, however, the flow slows, and a coating of ice frost forms on the outside of the cylinder. When the valve is closed the cylinder is weighed and is found to contain 14 kg of CO₂. Why does the outside become icy?