1)(90+0,1x)/(300+x)=0,14
x=1200.
2)3CuO+2NH3=3Cu+N2+3H2O
2 3
n(Cu)=24/64=0,375моль; n(NH3)=0,375/1,5=0,25моль; V(NH3)=0,25*22,4=5,6л.
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