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m=d*V
m=1,29 kg/m3 * 4l=1,29g/dm3 * 4dm3 (wiemy, że 1l= 1 dm3)
= 5,16g
d=1,29kg/m³=1,29g/dm³
1l=1dm³
m=d*V=1,29g/dm³*4dm³=5,16g