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230 Chapter Five Gases a. Which gas sample has the most molecules present? Explain. b. Which gas sample has the largest average kinetic energy? Explain. c. Which gas sample has the fastest average velocity? Explain. d. How can the pressure in the two containers be equal to each other since the larger gas B molecules collide with the con- tainer walls more forcefully? 101. Consider three identical flasks filled with different gases. Flask A: CO at 760 torr and O°C Flask B: N2 at 250 torr and O°C Flask C: H2 at 100 torr and O°C a. In which flask will the molecules have the greatest average kinetic energy? b. In which flask will the molecules have the greatest average velocity? 102. Consider separate 1.0-L gaseous samples of H2' Xe, C1 2 ,and O 2 all at STP. a. Rank the gases in order of increasing average kinetic energy. b. Rank the gases in order of increasing average velocity. c. How can separate 1.0-L samples of O 2 and H2each have the same average velocity? 103. Freon-12 is used as a refrigerant in central home air condition- ers. The rate of effusion of Freon-12 to Freon-ll (molar mass = 137.4 g/mol) is 1.07:1.The formula of Freon-12 is one of the following: CF 4 , CF 3 C\, CF 2 CI20CFCI 3 , or CCI 4 .
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