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V=a*b*c
V=3m*4,5m*2,5m=33,75m³
33,75m³ powietrza----100%
x m³ azotu---------------78%
x = 26,325m³ azotu
d=1,146g/dm³=1,146kg/m³
v=26,325m³
m=?
m=v*d
m=26,325m³*1,146kg/m³
m = 30,17kg azotu