Question

Calculeaza procentul masic de SO3 dintr-un amestec de acid sulfuric si SO3care contine in procente masice 33, 387 S

Answer 1

n1 moli  H2SO4 :    contine    n1S = n1 moli   m1S = 32n1 g
n2 moli  SO3                          n2S = n2         m2S = 32n2
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amestec : m = 98n1 + 80n2     mS = 32(n1 + n2)    %S = 33,387%
32(n1+n2)·100/(98n1+80n2) = 33,387 
1600n1 + 1600n2 = 1635,963n1 + 1335,48n2
264,52n2 = 35,963n1      n2 = 0,1359n1    mSO3 = 10,875n1
m amestec = 98n1 + 10,875n1 = 108,875n1
%SO3 = 10,875n1·100/(108,875n1) = 10%