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prin arderea unui mol de hidrocarbura rezulta 12,3 L de dioxid de carbon masurat la 27 de grade C si 6 atm si 54g apa. determinati:
a) formula moleculara a hidrocarburii
b) compozitia procentuala a hidrocarburii
c)densitatea in conditii normale
d) masa unei probe de hidrocarbura care ocupa in c.n. 56 mertii cubi


Răspuns :

pV = nRT
n = 12.3*6/(0.082*(27+273)) = 3 moli CO2
n = m/μ => m = 3*44 = 132 g CO2
44 g CO2...........12 g C
132 g CO2..............x g C
x = 36 g C
18 g H2O...........2 g H
54 g H2O.............x g H
x = 6 g H
36/12 = 3
6/1 = 6
FB: C3H6 => FM: (C3H6)n
Se arde 1 mol hidrocarbura => FM: C3H6
b) %C = 3*12/42 * 100 = 85.714%
%H = 6/42 * 100 = 14.285%
c) d = masa molara/volum molar
d = 42/22.4 = 1.875 g/l
d) V = n*22.4 => n = 56/22.4 = 2.5 kmoli C3H6
n = m/μ => m = 2.5*42 = 105 kg C3H6