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v=a*b*c
v=10m*5m*3m
v = 150m³ powietrza
150m³ powietrza --- 100%
xm³ tlenu ------------- 21%
x = 31,5m³ tlenu
v=31,5m³
d=1,43g/dm³=1,43kg/m³
m=v*d
m=31,5*1,43
m = 45,05kg tlenu
150m3 - 100%
x m3 - 21%
x=31,5m3 tlenu
d=1,43g/dm3 = 1,43kg/m3
d=m/V
m=d*V
masa tlenu =1,43kg/m3 * 31,5m3 = 45,05 kg