Răspuns :
a) CxH2xO + (3x-1)/2 O2 = xCO2 + xH2O
m O2/ m alcool = 2,444 0,5(3x-1)·32·n /(14x +16)·n = 2,4444
(14x + 16) 4,888 = 32(3x-1) 68,432x + 78,208 = 96x - 32 ⇒ x = 4
C4H8O
b) CH2=CH-CH2-CH2OH CH3 -CH=CH-CH2OH (izomeri cis si trans)
CH2=CH-CH*(OH)-CH3 (izomerie optica)
c) (A) CH2=CH-CH(OH)-CH3 +6[O] = CO2+2H2O + HOOC-CO -CH3
d)(B)CH2=CH-CH2-CH2OH +7 [O] =HOOC-CH2-COOH (acid propan dioic) +CO2 + 2H2O
e) K2Cr2O7 + 4H2SO4 = K2SO4 + Cr2(SO4)3 + 4H2O + 3[O]
nA / n K2Cr2O7 = 1/2 (7,2/72) / n = 1/2 ⇒ n =0,2moli ms =4840/20 = 242g
2KMnO4 + 3H2SO4 = K2SO4 + MnSO4 + 3H2O + 5[O]
nB/ nKMnO4 = 5/14 0,1/n = 5/14 n = 0,28 moli ms = 4424/20 = 221,2g
f) izomerie de functiune : A = alcool secundar B = alc. primar
m O2/ m alcool = 2,444 0,5(3x-1)·32·n /(14x +16)·n = 2,4444
(14x + 16) 4,888 = 32(3x-1) 68,432x + 78,208 = 96x - 32 ⇒ x = 4
C4H8O
b) CH2=CH-CH2-CH2OH CH3 -CH=CH-CH2OH (izomeri cis si trans)
CH2=CH-CH*(OH)-CH3 (izomerie optica)
c) (A) CH2=CH-CH(OH)-CH3 +6[O] = CO2+2H2O + HOOC-CO -CH3
d)(B)CH2=CH-CH2-CH2OH +7 [O] =HOOC-CH2-COOH (acid propan dioic) +CO2 + 2H2O
e) K2Cr2O7 + 4H2SO4 = K2SO4 + Cr2(SO4)3 + 4H2O + 3[O]
nA / n K2Cr2O7 = 1/2 (7,2/72) / n = 1/2 ⇒ n =0,2moli ms =4840/20 = 242g
2KMnO4 + 3H2SO4 = K2SO4 + MnSO4 + 3H2O + 5[O]
nB/ nKMnO4 = 5/14 0,1/n = 5/14 n = 0,28 moli ms = 4424/20 = 221,2g
f) izomerie de functiune : A = alcool secundar B = alc. primar