a)\(Zn+H2SO4-->ZnSO4+H2\)
b)\(n_{Zn}=\frac{19,5}{65}=0,3\left(mol\right)\)
\(n_{H2}=n_{Zn}=0,3\left(mol\right)\)
\(V_{H2\left(đktc\right)}=0,3.22,4=6,72\left(l\right)\)
c)\(H2+CuO-->Cu+H2O\)
chất rắn thu đc là Cu
\(n_{Cu}=n_{H2}=0,3\left(mol\right)\)
\(m=m_{Cu}=0,3.64=19,2\left(g\right)\)
\(PTHH:Zn+H_2SO_4\rightarrow ZnSO_4+H_2\)
Ta có :
\(n_{Zn}=n_{H2}=\frac{19,5}{65}=0,3\left(mol\right)\)
\(\Rightarrow V_{H2}=0,3.22,4=6,72\left(l\right)\)
\(PTHH:CuO+H_2\rightarrow Cu+H_2O\)
\(n_{Cu}=n_{H2}=0,3\left(mol\right)\)
\(\Rightarrow m=0,3.64=19,2\left(g\right)\)