Bai Tap Luyen Doi Tuyen Quoc Gia
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bµi luyÖn tËp sè 1/2001 C©u 1: a/ Hay m« t¶ cÊu tróc h×nh häc cña N(CH 3 ) 3 vµ N(SiH 3 ) 3 .Qua ®ã h·y so s¸nh 2 hîp chÊt (CH 3 ) 3 NBF 3 vµ (SiH 3 ) 3 NBF 3 vÒ ®é bÒn vµ tÝnh baz¬. Gi¶i thÝch. b/ §ång (Cu) kÕt tinh cã d¹ng tinh thÓ lËp ph¬ng t©m diÖn. • TÝnh c¹nh lËp ph¬ng a(Å) cña m¹ng tinh thÓ vµ kho¶ng c¸ch ng¾n nhÊt gi÷a hai t©m cña cña hai nguyªn tö ®ång trong m¹ng, biÕt r¨ng nguyªn tö ®ång cã b¸n kÝnh b»ng 1,28 Å. • TÝnh khèi lîng riªng d cña Cu theo g/cm 3 . (Cho Cu= 64). C©u 2: ë 25 0 C, ph¶n øng NO + 1 2 O 2 NO 2 Cã ∆ G 0 = -34,82 KJ ` vµ ∆ H 0 = - 56,43 KJ a/ H·y x¸c ®Þnh h»ng sè c©n b»ng cña ph¶n øng ë 298K vµ 598K. b/ KÕt qu¶ t×m thÊy cã phï hîp víi nguyªn lý chuyÓn dÞch c©n b»ng Le charterlier kh«ng? C©u 3: a/ Trén 1,1.10 -2 mol HCl víi1.10 -3 mol NH 3 vµ 1.10 -2 mol CH 3 NH 2 råi pha lo·ng thµnh 1 lÝt dung dÞch. Hái dung dÞch thu ®îc cã cã ph¶n øng víi axÝt hay baz¬? Cho pK b cña NH 3 = 4,76 vµ pK b cña CH 3 NH 2 = 3,40 b/ Kh¶ n¨ng khö cña Fe 2+ trong H 2 O hay trong dung dÞch kiÒm m¹nh h¬n? v× sao? Cho thÕ ®iÖn cùc chuÈn E 0 Fe 2+ /Fe = -0,44 V ; E 0 Fe 2+ /Fe = -0,04 V TÝnh sè tan Ks cña Fe(OH) 2 = 1,65.10 -15 vµ cña Fe(OH) 3 = 3,8.10 -38 C©u 4: Cho tõ tõ khÝ CO qua èng chøa 6,400gam CuO ®un nãng. KhÝ ra khái èng ®îc hÊp thô hoµn toµn b»ng 150ml dung dÞch níc v«i trong nång ®é 0,100M thÊy t¸ch ra 1,000gam kÕt tña tr¾ng, ®un s«i phÇn níc läc l¹i thÊy cã vÈn ®ôc. ChÊt r¾n cßn l¹i trong
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