<span>CH3COH+2Cu(OH)2 => CH3COOH+2CuOH+H2O </span>
<span>2CuOH => Cu2O+H2O</span>
<span>m(CH5COH)=55г.*0,4=22г.</span>
<span>n(CH3COH)=22г./44г./моль.=0,5моль</span>
<span>n(CH3COOH)=0,5моль</span>
<span>m(CH3COOH)=0,5моль*60г./моль=30г.</span>
<span>Ответ: 30г</span>
Масса вещества равна и делить на 100% получается 100х40:100=40г
ZnC<span>l2+2Na0H=Zn</span><span>(0H)2+2NaCl</span>
<span><span><span>Zn</span><span>(0H)2+2H<span>C</span><span>l=ZnC<span>l2+2H20</span></span></span></span></span>
<span><span><span><span><span><span>Zn</span><span>(0H)2+Na0H=<span>Zn</span><span>(0H)2+Na0H</span></span></span></span></span></span></span>
Дано:
ω(H)=5,58%
ω(O)=94,12%
__________
HxOy
___________________
Решение:
x:y = 5,58/1 : 94,12/16 = 5,58 : 5,88=1:1
Ответ: HO.