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CuO+H2SO4=CuSO4+H2O
M(CuO)=80г/моль
n(CuO)=m/M=20/80=0,25моль
n(CuO)=n(CuSO4)=0,25моль
M(CuSO4)=160г/моль
m(CuSO4)=n*M=160*0,25=16гр
16гр это100\%
х---------80\%
m((CuSO4)=16*80/100=12,8гр
1)MgS+H2O->H2S+MgO.
2)H2S+O2->H2O+S.
3)S+2Na(OH)2->Na2S+2H2O.
4)Na2S+Zn(OH)2->ZnS+Na(OH)2.
5)ZnS+H2O->SO2+ZnO.
по-моему так.
CH3COOK + HCl --> CH3COOH + KCl
CH3COOH + C2H5OH -->(H2SO4, t) CH3COOC2H5 + H2O
CH3COOC2H5 + NaOH --> CH3COONa + C2H5OH
CH3COONa + NaOH --> CH4 + Na2CO3
<span>2CH4 -->(t) C2H2 + 3H2</span>