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V=3*4*2,5=30m3=30000dm3
d=1,309 g/dm3
Szukane:
m=?
m=d*V
Obliczenia:
m=1,309 g/dm3*30000dm3
m=39270g
Tlen w powietrzu zajmuje 21%, więc:
39270g---100%
x g----21%
x=8246,7 g=8,2467 kg