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Determinati cantitatea de oxigen continuta in 4,9 g acid sulfuric.

Răspuns :

[tex]\mathtt{M_{H_2SO_4}=2A_H+A_S+4A_O=2+32+64=98g/mol}} \\ \\ \mathtt{98g \ H_2SO_4..........64g \ O} \\ \\ \mathtt{4,9g \ H_2SO_4..........x \ g \ O} \\ \\ \mathtt{x=\frac{4,9\cdot64}{98}=3,2g \ O}[/tex]