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obj.= a*b*c
obj.=4m*5m*3m
obj.60m3
obj tlenu= 60m3*0,21
obj tlenu= 12,6 m3
m=obj*d
m=12,6m3*1,43kg/m3
m=18,018kg
Zadanie 2
obj=3m*4n*2,5m
obj=30m3
obj azotu=30m3*0,78
obj azotu=23,4m3
m=obj*d
m=23,4m3*2,25kg/m3
m=52,65
Mam nadzieję, że jest dobrze bo nie jestem pewna.