On a hot humid day moisture condenses on the outside of a tall ice-cold drink Wh

Question

On a hot humid day moisture condenses on the outside of a tall ice-cold drink Which of the following is true? Condensation of moisture is an endothermic process; Condensation of moisture is an exothermic process; Condensation of moisture is an endothermic chemical reaction Condensation of moisture is an exothermic chemical reaction E. None of the above 10.0 grams of argon and 20.0 grams of neon are placed in a 1200.0 ml container at 25.0 degree C. The partial pressure of neon is atm. 20.4 5.60 8.70 0.700 3.40 A 255 ml. round-bottom flask is weighed and found to have a mass of 114.85 g. A few milliliters of an easily vaporized liquid are added to the flask and the flask is immersed in a boiling w ater hath. All of the liquid vaporizes at the boiling temperature of water. Ailing the flask with vapor. When all of the liquid has vaporized, the flask is removed from the bath, cooled, dried, and reweighed. The new mass of the flask and the condensed v apor is 115.23 g. Which of the following compounds could the liquid be? (Assume the pressure is 1 atm.) C_4H_10 C_3H_7OH C_2H_6 C_2H_5OH C_4H_9OH Which of the following is NOT correct? Volume of a gas at constant temperature is directly proportional to pressure. Volume of a gas at constant temperature is inversely proportional to pressure; Volume of a gas at constant pressure is directly proportional to temperature; Volume of a gas depends both on temperature and pressure; E. None of the above is true Which of the following is true if 1.0 mol He and 1.0 mol CH_4 gases are placed in the same balloon The pressure exerted by each gas will he the same; The pressure exerted by each gas will be proportional to their molar masses; He will exert 4 times more pressure than CH_4, CH_4 will exert more pressure because it has more atoms in its molecule; All of the above are true The real gases disobey the Boy les law and Charles law at Low temperature and low pressure; High temperature and high pressure; Low temperature and high pressure;

Explanation / Answer

11. A

12. A

mole Ne = 20.0 g Ne x 1 mol /20.0 g Ne = 1.00 mole Ne
mole Ar = 10.0 g Ar x 1 mole Ar/40.0 g = 0.25 mole
total mole of gases = 1.25
P = nRT/V = 1.25 mole x 0.0821 L atm/mol K x 298 K / 1.20L = 25.5 atm
ppm Ne = 25.5 atm x 1.00 mol Ne/1.25 total mol gas = A = 20.4 atm

13. D

14. A

15. A

16. C

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