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Unformatted text preview: l..._..______._ _._._. . The height of the mercury columniii a barometer is awn—"iIeasure 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 — crosssectional 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 9817“ x 0454 “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 PVaé, :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 : . ._ . MZé‘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 whoe_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 102 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 Kmol 1.05 L _ n = —— = 0.9737 atm x ———~—— x Mew : 0.04019 = 0.0402 mol of as
RT . 0.08206 Latm _ 10 g ._. 0.04019 mol x 6.022 x1023 molecules = 2.42 X 1022 gas molecules 1 mol _ ...
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 Winter '08
 Zellmer
 Chemistry, Torr, 7 g

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