Zn+2HCl=ZnCl2+H2
n(H2)=67.2/22.4=3 моль=n(Zn)
m(Zn)=65*3=195 г
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AgNO3 + NaCl = AgCl + NaNO3
Ag(+) + NO3(-) + Na(+) + Cl(-) = AgCl + Na(+) + Cl(-)
Ag(+) + Cl(-) = AgCl
2Al+2NaOH+6H2O=2Na[Al(OH)4]+3H2
n(H2)=2,24/22,4=0.1 моль
n(Al)=(0.1/3)*2=0.067 моль
m(Al)=0.06*27=1.809
w(Al)=1.809/10*100=18.09%
w(Cu)=100-18.09=81.91%