valin i hno2

Submitted by trolololo lo on Tue, 07/01/2014 - 20:09
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Koliko se dm3 azota oslobadja dejstvom azotaste kis. na 20.6g valina(n.u.)? R:3.94 

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milicaradenkovic - Wed, 07/02/2014 - 08:46

(CH3)2CHCHNH2COOH+HO-NO------------------->(CH3)2CHCHOHCOOH+N2+H2O

n(valina)=m/Mr=20.6/117=0.176 mol

n(N2)=n(valina)=0.176 mol

V(N2)=n(N2)*Vm=22.4*0.176=3.94 dm3