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Cm2 = 1 mol/dm3
700cm3 = 0,7 dm3
4 mole - 1dm3
x moli - 0,7dm3
x = 2,8 mola
1 mol - 1dm3
2,8 mola - x dm3
x = 2,8 dm3
2,8dm3 - 0,7dm3 = 2,1dm3 = 2100cm3 co w przypadku wody oznacza 2100g wody.