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125ch10a_002 - l The height of the mercury column-iii a...

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Unformatted text preview: l..._..______._ _._._. . The height of the mercury column-iii a barometer is awn—"iIe-asure of atmospheric pressure. ‘ Hg column is steady when the pressure exerted by the atmosphere is equal to'the downward mmpressure due to the mass of the Hg column. Pressure is defined as force per unit area. I. I. ' "Thus, the larger the diameter of the Hg column, the greater the mass of Hg and the greater ' ' 'the total force exerted by the Hg column. However, this force is distributed over a larger —- cross-sectional area. so the ratio of forcei'area,' the pressure, is the same as that of a smaller ' ' —' '--—- diameter cplumn. The same length .Hg column is refifiired to balance afin—os'pheric pressure, - regardless of the diameter of the column. '2 525' ' Wmm) . j ac; (gag ,4, .-.- ' .. . ___ _. ._ ' ' "E' __ 7) (a) . 0.860 atmx 101.325 kPa : 8m kPa 1 atm - 1 atm - b 45?t = 0.601 .. ._( ) O” x 750mm aim fl/vaé 5 1790M :. .. . 1 u 1.. .. .. . . c 802mmH xw =106 t - _ ( ) g 760 mm Hg a m .. 247‘” cWaéé)... ._ T60 torr 1 atm .. (d) 0.897 atm X = 682 torr . -_ I I 2 I‘d—Ffin—‘uHH—I '- l: P: M: 135") x 9-817“ x 0-454 “9 x E94 '" =1.9 x103kPa . a A 0.50 in? 182 1 'b 1 m2 - . ..m_a _ 25L _ . __ m W / P P flesflM fl __W —%awf 7 .770091‘Q : 7&1 - :7: i5) W7 4 .. 2%! ",0 ém/égmy; " " ' _. :1 . . f. “ ‘— @ / 7 g i MIME/56m for Jalwéifirz’a/ > ‘fl'FdP/M/ y % . I/ :‘z/é 41%) #2 P-Vaé, :mW' . .. V” _. m 14 ab VJ .. . _ . . . . . .. _. ___________.__.___._________.._ . . ’7 a 713 .f‘ .. . ___.__.______._ . 4:) a =_./g_g;_2_;@_i__fm’i 2%.” . 1/ ; MW 3- _. "" " :' 3% V (@M : {m ._ Val. f y}: T m jib/g : . ._ . M-Zé‘wd- ...a up .5. _. ..._Za'cfi'ffl _, .77: maid. f2?31$% 302.33K I. .. a" .7. . fl. 73, "'3¢_§Z;'2E/(__:fM ~= - - ..nggg._/f/( )_&é79L....:. . 4.. lAvogadro's hypothesis states that equal volumes of gases at the same temperature __ .. _. ..._ _ and pressUre contain equal numbers of molecules. Since molecules react in the ____ __ ratios of small whole numbers, it follows that the volumes of reacting gases-(at the _ ______ __ same temperature and pressure) are in the ratios of small who|e_n_urr_1bers. _ . ._ @4222); t’m‘?‘%§%flgz Xe : ...'.:_§_'_"""""'—“—— . __________ ._.._<£<; .. Xé g According to Avogadro's hypothesis, the mole ratios in the chemical equation wilt be volume . _ 5 ratios for the gases if they are at the same temperature and pressure. N2(Q)'+ 3H2(g) —) ZNHaGg) .. flag/9;; __ 2a 21/0341 14.. (9.291426, : Jet/Mag - __ [€Mm.. 69ml“..- ____.‘____. .. _. A/t/AQ_§.,;2.1_L___/_/g x ’73.; a: = (WA/Viz. / .. . ' a) ' 1%” {WM 7’ Pnesggrgw ,0 _______ .. .. ..M<z£_ _ ‘ £02& V41 4 71m Keg/1011 .. é). .T'MzfiiZngE _ ' ' __ 74w x fig” = A 52.32 4%,; _ ___._.________._ [Z 3. g __ _ ~— __ _. _ ..._ . _ ________ __é __ n = 2.9511101, P = 0.76 atm, T = 52°C = 325 K . _ _ — __ V = L" = 2.95 mol >< 008206 L'atm >< — 325 K =10 x102 L __ P K. m0] 0.76 81m 1 n = 9.87 x 10-2 mol, V: 164 mL = 0.164 L . P = 682 torr x 1 3”“ = 0.8974 = 089? atm 760 torr ___"|"= fluo_8974atmxflLx fl=182K “R I mol L. atm ._. ._ ..._._._.._.___..._._...__ Air is a mixture of N2 and 02, but for the purpose of calculating pressure, only the total number __ ofgas molecules is important. not the identity of these molecules. __"________ V =1.05 L, T = 37°C = 310 K, P = 740 mm Hg x 1 em = 0.9737 2 0.9?4 atm 760 mm —_ ' PV K-mol 1.05 L _ n = —— = 0.9737 atm x ———~—— x Mew : 0.04019 = 0.0402 mol of as RT . 0.08206 L-atm _ 10 g ._. 0.04019 mol x 6.022 x1023 molecules = 2.42 X 1022 gas molecules 1 mol _ ...
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