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V=a*b*c
V=3m*5m*3m=45m³
45m³ powietrza----100%
x m³ azotu-----------78%
x = 35,1m³ azotu
d=1,146g/dm³=1,146kg/m³
v=35,1m³
m=?
m=v*d
m=35,1m³*1,146kg/m³
m = 40,22kg azotu