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Chem+160+Handout+Problems

# Chem+160+Handout+Problems - HANDOUT PROBLEMS H1CH12 You add...

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HANDOUT PROBLEMS H1CH12. You add 23.0 g of ice at –2.2°C to 248 mL of hot coffee at 98.4°C. What is the final temperature of the coffee? (Assume that the heat capacity and density of the coffee are the same as for water and that the coffee cup is well insulated.) H2CH12. The standard heat of formation of gaseous dimethyl ether (H 3 COCH 3 ) is –185.4 kJ/mol. The vapor pressure of dimethyl ether is 1.00 atm at –23.7°C and 0.526 atm at –38.7°C. (a) Calculate the standard heat of vaporization of dimethyl ether. (b) Calculate the standard heat of formation of liquid dimethyl ether. H3CH12. In an experiment, 4.00 L of N 2 is saturated with water vapor at 22°C and then compressed to half its volume. (a) What is the partial pressure of H 2 O in the compressed gas mixture? (b) What mass of water vapor condenses to liquid? H4CH12. A greenhouse contains 216 m 3 of air at 26°C, and a humidifier in it vaporizes 4.00 L of water. (a) What is the pressure of water vapor in the greenhouse, assuming that none escapes and that the air was originally completely dry? The density of water is 1.00 g/mL. (b) What total volume of liquid water would have to be vaporized to saturate the air? (See Table 5.2, page 157.) H5CH12. Polonium is a rare radioactive metal that is the only element with a crystal structure based on the simple cubic unit cell. If its density is 9.142 g/cm 3 , calculate an approximate atomic radius for polonium.

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