Zn+2HCl->ZnCl2+H2
0,05--------------------0,05
CuO+H2-to>Cu+H2O
0,05----0,05
n Zn=\(\dfrac{3,25}{65}=0,05mol\)
=>n CuO=\(\dfrac{6}{80}=0,075mol\)
=>CuO dư
=>m Cu=0,05.64=3,2g
=>m CuO dư=0,025.80=2g
\(a,PTHH:\\ Zn+2HCl\rightarrow ZnCl_2+H_2\uparrow\left(1\right)\\ CuO+H_2\underrightarrow{t^o}Cu+H_2O\left(2\right)\\ b,n_{Zn}=\dfrac{3,25}{65}=0,05\left(mol\right)\\ Theo.pt\left(1\right):n_{H_2}=n_{Zn}=0,05\left(mol\right)\\ n_{CuO}=\dfrac{6}{80}=0,075\left(mol\right)\\ LTL.pt\left(2\right):0,075>0,05\Rightarrow CuO,dư\\ Theo.pt\left(2\right):n_{Cu}=n_{CuO\left(pư\right)}=n_{H_2}=0,05\left(mol\right)\\ m_{Cu}=0,05.64=3,2\left(g\right)\\ c,m_{CuO\left(dư\right)}=\left(0,075-0,05\right).80=2\left(g\right)\)