Question

19. What is the mole fraction of H, in a mixture with a total pressure of 800 torr when the partial pressure of H2 is 90 torr? a. 0.11 d. 0.5 b. 8.8 e. 0.88 c. 1.0 20. The kinetic theory of gases assumes that collisions a. with the walls of the container cause energy to be lost. b. of molecules with each other cause energy to be lost. c. are caused by molecules attracting each other. d do not result in a change in the energy of the molecules. e. do not occur because the size of the molecules is negligible. Which of these gases (Ar, N20, H2) has the same average kinetic energy at 25°C as CO2? a. Ar d. They are all the same as CO2. b. N20 e. They are all different from CO2. c. H2 22. The following graph shows the gas speed distributions for four different gases, all at the same temperature. Which of the curves is for the lightest gas? Fraction of molecules with speedu Speed (m/s) a. b. a b c. d. c d

Answer 1

Thu mol naction af any gas A A u ve by A Pantial Pusura af us PA Ptot PA A total pruunu Ptol Heru given = 90 tonn PH2 Ptot So, 9d tonn PH2 80torn Pot = 0.11

econdivg b Kinetic ftluony of gas, b coliyi letuuen gus panti on collisiou af qqus pantielu uitu 1u wall af tlu conlainun penfeety elastic ie. thenu is mo eneng doss af thu quj mueuda dunin tu eolliion uuilu each otun on uith tu wal of tu eontainun So, opliod dovt rusult im a change in 1 eneny af tu mouculus mouul average kinatic emeng af gaj 3RT So, Kinutic gaj moluule dspends on te temperatune (trum equalim 1 ) not on moluularn mus.af tw qu moliculus As au gase (An, N20, H) an at same tempenatune also enang (25C as co, so tunu avenu Kintic becomu Samu So optin d) all te ami as coz aTLe 22 As the muleeulan mu of gus mole cula ineruases ,veloeit af the moluul deeruus, accondingl tu fracdin af zas muleeules itu iyhtin uuight ave ighun veloc So eunve d ruprusent the liyhutën gus option d