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20 l = 20 dm3
V = 20 dm3= 20000 cm3
d = 2g/cm3
wzór na gęstość: d=m/V
Po przekształceniu: m=d*V
m= 2g/cm3 * 20000 cm3 = 40000 g = 40 kg
Odp. C
20L = 20dm3 = 20000 cm3
d=m/v
m=d*v
podstawiamy
m= 2[g/cm3] * 20000 cm3 = 40000g = 40 kg