Răspuns :
n1 moli SO2 + 1/2O2 ⇒SO3
SO3 + H2O ⇒ H2SO4
initial : amestec gazos : SO2: 0,96n moli O2: 1,1·1/2·n1 = 0,55n1
ni = n
final : SO2 : (0,96n - n1 )moli; O2 : o,55n1 - o,5n1 = 0,05n1 ; SO3 : n1 moli;
n final = n - n1 - n1 /2 + n1= n - 0,5n1
(0,96n - n1)·100/(n - 0,5n1) = 20 4,8n - 5n1 = n - 0,5n1 3,8n = 4,5n1
a) n1/n ·100 = 380/4,5 = 84,44%
b) consideram Vs = 1l = 1000cm³ ⇒⇒ ms = q·Vs = 1841g md = 1841·0,98
n = 1841·0,98/98 = 18,41 moi cM = 18,41 moli /l
solutie1 : Vs1 = 10l cM1 = 18,41mol/l n1 = 184,1 moli
solutie 2 : Vs2 = x cM2 = 5mol/l n2 = 5x
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Vs = 10+ x c =10mol/l n = 184,1+ 5x (184,1+5x)/(10+x) = 10
184,1 + 5x = 100+ 10x 5x = 84,1 x = 16,82 l
c) 10 l sol. H2SO4 98% ⇔⇔ ms = 18410 g md = 18041,8 mH2O=368,2g
nH2O = 20,455moli
mSO3 + 18410 = 23580 mSO3 = 5170 g n= 64,625 moli V= 1447,6 l
SO3 + H2O ⇒⇒ H2SO4
reactioneaza : 20,455moli SO3 + 20,455moli H2O
raman in oleum : 64,625 - 20,455 = 44,17 moli m = 3533,6g
% SO3 in oleum = 3533,6··100/23580 = ≈ 15%
SO3 + H2O ⇒ H2SO4
initial : amestec gazos : SO2: 0,96n moli O2: 1,1·1/2·n1 = 0,55n1
ni = n
final : SO2 : (0,96n - n1 )moli; O2 : o,55n1 - o,5n1 = 0,05n1 ; SO3 : n1 moli;
n final = n - n1 - n1 /2 + n1= n - 0,5n1
(0,96n - n1)·100/(n - 0,5n1) = 20 4,8n - 5n1 = n - 0,5n1 3,8n = 4,5n1
a) n1/n ·100 = 380/4,5 = 84,44%
b) consideram Vs = 1l = 1000cm³ ⇒⇒ ms = q·Vs = 1841g md = 1841·0,98
n = 1841·0,98/98 = 18,41 moi cM = 18,41 moli /l
solutie1 : Vs1 = 10l cM1 = 18,41mol/l n1 = 184,1 moli
solutie 2 : Vs2 = x cM2 = 5mol/l n2 = 5x
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Vs = 10+ x c =10mol/l n = 184,1+ 5x (184,1+5x)/(10+x) = 10
184,1 + 5x = 100+ 10x 5x = 84,1 x = 16,82 l
c) 10 l sol. H2SO4 98% ⇔⇔ ms = 18410 g md = 18041,8 mH2O=368,2g
nH2O = 20,455moli
mSO3 + 18410 = 23580 mSO3 = 5170 g n= 64,625 moli V= 1447,6 l
SO3 + H2O ⇒⇒ H2SO4
reactioneaza : 20,455moli SO3 + 20,455moli H2O
raman in oleum : 64,625 - 20,455 = 44,17 moli m = 3533,6g
% SO3 in oleum = 3533,6··100/23580 = ≈ 15%