- LUYEN TAP : TOC DO PHAN UNG VAC AN BANG HOA HOC
7.26. a) Tang dp sudt (tfte la tdng ndng do cac chd't phan ftng).
b) Tang nhiet do.
c) Dung chd't xuc tdc (thf du platin).
7.27. Khi NH3 tao ra lai bi phdn buy thanh N2 va H2 nen chi thu dugc mdt lugng nhd NH3.
Khi cd mat H2SO4 thi NH3 tac dung vdi H2SO4 tao thanh mudi:
NH3 + H2SO4 > NH4HSO4 2NH3 + H2SO4 > (NH4)2S04
Do vdy cdn bdng chuyin dich vl phfa tao thanh NH3 va phan ftng cd thi dugc thgc hien hoan toan.
7.28. C.
7.29. Ddi eac ndng dd phdn tram sang ndng do mol// : cdc dung dich Na2S203 da dung cd nong do la 0,01M ; 0,02M ; 0,04M ; 0,05M va 0,1M.
Thdi gian phan ftng cua cac dung dich ldn lugt la 5ph ; 2ph30s ; lphl5s ; Iph va 30s.
7.30*. De tao ra 0,6 mol isopropyl axetat cdn tieu hao 0,6 mol axit axetic, 0,6 mol
ancol isopropylic. Lugng nudc tao ra cung la 0,6 mol. Khi cdn bdng ldn thft nhd't dugc thiet lap, ndng do mol cdc chd't trong hdn hgp nhu sau:
[CH3COOC3H7] = ^ (mol//) ; [H2O] = ^ (mol//) ;
[CH3COOH] = ^ (mol//) ; [C3H7OH] = ^ (mol//). (V la thi tich cua hdn hgp phan ftng)
Hdng sd cdn bdng :
[CH3COOC3H7].[H20] ^ 036 ^ 2 25 [CH3COOH].[C3H70H] 0,16
Khi them 1 mol axit axetic vao hdn hgp dang cdn bdng thi can bdng se chuyin dich.
CH3COOH + C3H70H ^ CH3COOC3H7 + H20 Luc bdt ddu thdm axit 1,4 mol 0,4 mol 0,6 mol 0,6 mol Bie'n ddi - x mol - x mol +x mol +x mol Luc cd cdn bdng mdi (l,4-x)mol (0,4-x)mol (0,6+x)mol (0,6+x)mol
Khi cdn bdng dugc thidt ldp lai, ndng dd mol cac chdt nhu sau :
[CH3COOC3H7] = ^ ^ ; [H2O] = M ± i L ; [CH3COOH] = ^ ^ ^ ; [C3H7OH] = ^^^p-
(V la thi tich cfta hdn hgp phan ting luc dd).
Hdng sd cdn bdng eua phan ftng vdn la 2,25 ndn ta cd :
(0,6+ x) ^ 2 2^ ^ l,25x^-5,25x + 0,9 = 0. (1,4 - x).(0,4 - X)
Phuang trinh nay cd hai nghidm : Xj = 4,02 va X2 = 0,18.
Chi cd nghidm x = 0,18 la thfch hgp vi 1,4 - 4,02 < 0 la vd If. Vdy khi cdn bdng dugc thidt ldp trd lai, hdn hgp phan ftng cd :
1,4 - 0,18 = 1,22 (moi CH3COOH) ; 0 , 4 - 0 , 1 8 = 0,22 (mol C3H7OH);
0,6 + 0,18 = 0,78 (mol CH3COOC3H7) vd 0,78 mol H2O.
MUC LUC
Trang
PHAN M O T : CAU HOI VA BAI TAP
Chi/ong 1 : NGUYEN TCT 3
Bai dn tap 3
Bai 1: Thanh phan nguyen tft 5 Bai 2 : Hat nhan nguyen tft. Nguyen td hoa hgc 6
Bai 3 : Dong vi. Nguyen tft khdi va nguyen tft khdi trung binh 7 Bai 4 : SU chuyen dgng cCia electron trong nguy§n tft. Obitan nguyen tft 8
Bai 5 : Luyen tap ve : thanh phan cau tao nguyen tft. Khdi li/Ong cOa
nguyen tu. Obitan nguyen tft 9
Bai 6 : Ldp va phan Idp electron 10 Bai 7: NSng iuong cCia cac electron trong nguyen tft. Cau hinh electron
nguyen tft 11
Bai 8 : Luyen tap chUOng 1 12
Chi/Ong 2 : BANG TUAN HOAN CAC NGUYEN TO HOA HOC 14