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b=2m
c=2,5m
V=a*b*c
V=3m*2m*2,5m=15m3
15m3 powietrza ----- 100%
xm3 azotu ------------- 78%
x = 11,7m3 azotu
v=11,7m3
d=1,15kg/m3
m=v*d
m=11,7*1,15
m = 13,455kg azotu