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2C2H2 + O2 > 4C +2H20
1,07g to 1dm3
x to 10dm3
x=10,7g
masa 2C2H2 =52u
masa 4C (produkt stały, sadza) to 48u
czyli: z 52u powstaje 48u
z 10,7g powstaje X
x=9,88g