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Ce cantitate de hidrogen se gaseste in 68 g H2S ?

Răspuns :

MH2S = 2AH + AS = 2*1+32=34g/mol

mH=2*1=2g

34g H2S..........................2g H
68g H2S..........................x=4gH
[tex] H_{2} [/tex]S este acidul sulhidric
[tex] m_{H2S} [/tex]=68g
[tex] M_{H2S} [/tex]= 2*1+1*32 = 2+32-34
1 mol acid sulhidric = 34 g 
In 34 g [tex] H_{2} S[/tex]---------- 2g H
In 68 g ---------- x g H

[tex] \frac{34}{68} [/tex]=[tex] \frac{2}{x} [/tex] 
x=[tex] \frac{2*68}{34} [/tex] = 4 g H