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