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Yl14_lah - 1 Dikromaatiooni tekkimise kiirus reaktsioonis 2...

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1. Dikromaatiooni tekkimise kiirus reaktsioonis 2 CrO 4 2- (aq) + 2 H + (aq) = Cr 2 O 7 2- (aq) + H 2 O (v) on 0.14 mol·L -1 ·s -1 . Milline on kromaatiooni ärareageerimise kiirus? Milline on reaktsiooni unikaalne kiirus? Lahendus: [ CrO 4 2 ] t = 2 [ Cr 2 O 7 2 ] t = 0.28 mol l s v unikaalne = [ CrO 4 2 ] 2 ⋅ t = [ Cr 2 O 7 2 ] t = 0.14 mol l s 2. Reaktsiooninõusse mahuga 750 ml pannakse 0.45 grammi H 2 ja 0.16 grammi I 2 ning kuumutatakse 700 K-ni, kus nad reageerivad teist järku (kummagi reagendi suhtes esimest järku) kineetika järgi. Reaktsiooni kiiruskonstant k=0.063 L ·mol -1 ·s -1 . Milline on reaktsiooni algkiirus? Kui palju muutub reaktsiooni kiirus, kui H 2 algkontsentratsiooni tõsta 2 korda? Lahendus : v = k [ H 2 ][ I 2 ]= . 0 063 l mol s 0.45 g 2 g mol 0.75 l 0.16 g 254 g mol 0.75 l = 1.6 10 5 mol l s H 2 algkontsentratsiooni tõstmine 2 korda kiirendab reaktsiooni 2 korda. 3. Reaktsiooni CH 3 Br (aq) + OH - (aq) = CH 3 OH (aq) + Br - (aq) kiirus kahekordistus, kui OH - kontsentratsiooni tõsteti 2 korda. Kui CH 3 Br
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