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m O2=32g/mol
120*32=3840g do spalenia 2 moli C60
2 mole C60 ---- 2*6,02*10^-23 cząst. C60
x moli C60 ---- 2 cząst. C60
x=3,32*10^-22 mola
2 mole C60 ---- 3840g O2
3,32*10^-22 ---- xg O2
x=6,37*10^-19 g. O2
Odp. Potrzeba 6,37*10^-19 grama tlenu.