n(O2) = 15×10^23 : 6.02 × 10^23 = 2.5моль
m(O2)= 2.5моль × 32г/моль = 80г
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n(O2) = 15×10^23 : 6.02 × 10^23 = 2.5моль
m(O2)= 2.5моль × 32г/моль = 80г