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C6H5NO2=123u
C6H6 + HNO3------>C6H5NO2 + H2O (na strzałce"stęż. H2SO4")
78g benzenu------123g nitrobenzenu
123g benzenu------xg nitrobenzenu
x=123*123/78
x=193,96g nitrobenzenu
193,96g nitrobenzenu------100%
xg nitrobenzenu--------------85%
x=193,96*85/100
x=164,87g nitobenzenu