Question

Volumul solutiei 5M de dicromat de potasiu in mediu de acid sulfuric consumat la oxidarea a 33,6L (c.n.) amestec echimolar de alchene izomere C4H8 (inclusiv stereoizomeri) este egal cu............

Answer 1

niu= 3,36l/22,4l/mol= 0,15mol amestec echimolecular
CH3-CH=CH-CH3(cis ,trans)+4O-->2CH3COOH  ..0,5molx2                                   
CH2=CH-CH2-CH3 +5O---> CO2+H2O+CH3-CH2-COOH      0,5mol
CH2=C(CH3)-CH3+4O---> CO2+H2O+(CH3)2C=O                 0,5mol
total (0,5x2x4+0,5x5+0,5x4)= 8,5molO
K2Cr2O7+4H2SO4--> K2SO4 + Cr2(SO4)3 +4H2O+3O
1mol.K2Cr2O7.......   3molO
x----------------------8,5mol
x=8,5/3 mol K2Cr207
C= niu/V     5= 8,5/3V---> V=0,566l=566ml slotie