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C2H5OH ---(-H2O)---> C2H4
10g x
x=10*22.4/46=4.87dm3
C₂H₅OH --Al₂O₃--> C₂H₄ + H₂O
46g alkoholu ------ 22,4dm³ etenu
10g alkoholu ------- x dm³ etenu
x = 4,87dm³ etenu