Zn + 2HCl-----> ZnCl2 +H2
a) Ta có
n\(_{Zn}=\frac{0,65}{65}=0,01\left(mol\right)\)
n\(_{HCl}=\frac{7,3}{36,5}=0,2\left(mol\right)\)
=> HCl dư
Theo pthh
n\(_{HCl}=2n_{Zn}=0,02\left(mol\right)\)
=> n\(_{HCl}dư=0,2-0,02=0,08\left(mol\right)\)
m\(_{HCl}dư=0,08.36,5=2,92\left(g\right)\)
b) Theo pthh
n\(_{H2}=n_{Zn}=0,01\left(mol\right)\)
V\(_{H2}=0,01.22,4=0,224\left(l\right)\)
c) Theo pthh
n\(_{Zn}=\frac{1}{2}n_{HCl}=0,1\left(mol\right)\)
=> n\(_{Zn}thêm=0,1-0,01=0,09\left(mol\right)\)
m\(_{Zn}thêm=0,09.65=5,85\left(g\right)\)
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