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v=a*b*c
v=4*4*3
v=48m³ powietrza
48m³ powietrza ----100%
x m³ azotu ---------- 78%
x = 37,44 m³ azotu
v=37,44 m³
d=1,146g/dm³=1,146kg/m³
m=v*d
m=37,44*1,146
m = 42,9kg azotu