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m helu =?
d=0,164g/dm3
wzór m=d*v
m=50000dm3*0,164g/dm3=8200g
odp. Masa helu wynosi 8200g.
g= 0,164 g/dm3
m= V * g
m= 50 000*0,164
m= 8200(g)=8.2 kg