А) 2Cu+O2=2CuO
2CuO=2Cu+O2
б) 2Fe2O3=4Fe+3O2
2Fe+O2=2FeO
<span><em>2CH3COOH + Zn = (CH3COO)2Zn + H2</em>
</span>m(Ch3cooh)=500*0,12=60г
n(Ch3cooh)=60/60=1моль
n(Zn)=0,5
n(ch3cooh)=0,5моль
m(Zn)=0,5*65=32,5г
химическое колличество ? ню=масса/молярную массу.
ню=117/23+35.5=2
AlCl3 + 3NaOH = Al(OH)3 + 3NaCl
n(Al(OH)3) = 60/78 = 0,77 моль
n(NaOH) = 3*<span>0,77 = 2,31 моль
m(</span>NaOH) = <span>2,31*40 = 92,4 г
m р-ра = m в-ва*100%/</span>ω% = <span>92,4*100%/15% = 616 г</span>