stehiometrija

Submitted by Emily12 on Sat, 06/14/2014 - 00:30
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Koliko se grama natrijum hidroksida troši za rastvaranje 8, 1 g cink oksida?

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milicaradenkovic - Sat, 06/14/2014 - 08:54

ZnO+2NaOH+H2O---------------->Na2(Zn(OH)4)

n(ZnO)=m/Mr=8.1/81=0.1 mol

n(NaOH)=2*n(ZnO)=2*0.1=0.2 mol

m(NaOH)=n(NaOH)*Mr=40*0.02=8 g

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Emily12 - Sat, 06/14/2014 - 09:54

Oprostite, ali nije li tu važna ova 2 ispred NaOH? 

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milicaradenkovic - Sat, 06/14/2014 - 09:55

Stavila sam je ja kod molova NaOH.

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Emily12 - Sat, 06/14/2014 - 09:55

Jao, sad uvidjeh. :) Hvala Vam! :)