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v=a*b*c
v=3m*4m*3m
v = 36m3
36m3 powietrza ----- 100%
xm3 tlenu ------------- 21%
x = 7,56m3 (tlen)
v=7,56m3
d=1,309g/dm3=1,309kg/m3
m=v*d
m=7,56*1,309
m=9,9 kg tlenu (WYNIK