o molecula de H2S are 4 electroni pusi in comun...2 de la S si cate unul de la fiecare atom de H
[tex]M_{H2S}=2A_{H}+A_{S}=2*1+32=34
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[tex]1 mol=6.022*10^{23} molecule
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intr-o molecula sunt 4 electroni pusi in comun,deci intr-un mol:[tex]4*6.022*10^23=24.088*10^{23}[/tex]
[tex]32 g H_{2}S......24.088*10^{23}[/tex] e pusi in comun
[tex]x g H_{2}S.....48.176* 10^{23}[/tex] e pusi im comun
x=[tex] \frac{32*48.176*10^2^3}{24.088*10^{23}} =64 g H_{2}S[/tex]
