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Chemie

Kolik procent vody přibližně obsahuje sloučenina Na2CO3 x 10H2O (relativní atomová hmotnost sodíku je 23, kyslíku=16, uhlíku=12, vodíku=1):

Kolik procent vody přibližně obsahuje sloučenina Na₂CO₃ x 10H2O (relativní atomová hmotnost sodíku je 23, kyslíku=16, uhlíku=12, vodíku=1):