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Scan_Doc0137 - Exercises 229 85 The partial pressure of...

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85. The partial pressure ofCH 4 (g) is0.175 atm and that of 02(g) is 0.250 atm inamixture ofthetwo gases. a. What isthemole fraction ofeach gas inthemixture? b. If the mixture occupies avolume of 10.5 L at 65 D C, calcu- late thetotal number ofmoles ofgas inthemixture. c. Calculate the number of grams of each gas in the mixture. 86. A1.00-L gassample at100.DCand600. torrcontains 50.0% he- lium and 50.0% xenon by mass. What are thepartial pressures oftheindividual gases? 87. Small quantities ofhydrogen gas can beprepared inthe labora- torybytheaddition ofaqueous hydrochloric acidtometallic zinc. Zn(s) + 2HCI(aq) ----7 ZnCI 2 (aq) + HzCg) Typically, thehydrogen gasisbubbled through water forcollec- tion andbecomes saturated with water vapor. Suppose 240. mL ofhydrogen gas iscollected at 30. D C andhas atotal pressure of 1.032 atmbythisprocess. What isthepartial pressure ofhydro- gen gas inthe sample? How many grams ofzinc must have re- acted toproduce this quantity ofhydrogen? (The vapor pressure ofwater is32torr at 30 D C.) 88. Helium iscollected over water at 25 D C and 1.00atm total pres- sure.What totalvolume ofgasmustbecollected toobtain 0.586g helium? (At 25 D C the vapor pressure ofwater is23.8 torr.) 89. At elevated temperatures, sodium chlorate decomposes to pro- duce sodium chloride andoxygen gas.A0.8765-g sample ofim-

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