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O proba de oleum cu masa 200g se amesteca cu 100g H2O. Stiind ca oleumul(solutie SO3 in H2SO4) contina 20% SO3 , calculati concentratia procentuala a solutiei rezultate.Explicati.

Răspuns :

ms=md+mH2O=200+100=300g

0.2*200=40g SO3, adica in 200g sol. SO3 se gasesc 40g SO3 si restul H2SO4 => 200-40=160g H2SO4

100g SO3...................20g SO3..............80g H2SO4
200g............................x=40g...................y=160g


80g......18g............98g
SO3 + H2O ---> H2SO4
40g.....9g...........x=49g

md=160+49=209g 

Cp=md/ms*100=209/300*100=69.(6)% oleum