\(n_{AgNO_3}=0,009.2=0,018\left(mol\right)\\ n_{NaX}=1,5.0,01=0,015\left(mol\right)\\ NaX+AgNO_3\rightarrow AgX\downarrow+NaNO_3\\ Vì:\dfrac{0,018}{1}>\dfrac{0,015}{1}\\ \Rightarrow AgNO_3dư\\ \Rightarrow n_{AgX}=n_{NaX}=0,015\left(mol\right)\\ \Rightarrow M_{AgX}=\dfrac{2,82}{0,015}=188\left(\dfrac{g}{mol}\right)=M_{Ag}+M_X=M_X+108\\ \Leftrightarrow M_X=80\left(\dfrac{g}{mol}\right)\\ \Rightarrow X:Brom\left(Br=80\right)\\ 2,dd.sau.phản.ứng:AgNO_3\left(dư\right),NaNO_3\\ n_{AgNO_3\left(p.ứ\right)}=n_{NaNO_3}=n_{NaBr}=0,015\left(mol\right)\\ \Rightarrow n_{AgNO_3\left(dư\right)}=0,018-0,015=0,003\left(mol\right)\)

a)

\(\left\{{}\begin{matrix}n_{Na_2CO_3}=0,3.1,5=0,45\left(mol\right)\\n_{NaHCO_3}=1.0,3=0,3\left(mol\right)\end{matrix}\right.\)

PTHH: Na₂CO₃ + HCl --> NaCl + NaHCO₃

                0,45-->0,45-------------->0,45

             NaHCO₃ + HCl --> NaCl + CO₂ + H₂O

                 0,15<----0,15---------->0,15

=> V_CO2 = 0,15.22,4 = 3,36 (l)

b)

n_NaHCO3 = 0,6 (mol)

Bảo toàn C: n_BaCO3 = 0,6 (mol)

=> m_BaCO3 = 0,6.197 = 118,2 (g)

Câu 2

a) 

\(m_{CuO\left(pư\right)}=10-6=4\left(g\right)\)

=> \(n_{CuO\left(pư\right)}=\dfrac{4}{80}=0,05\left(mol\right)\)

\(n_{H_2SO_4\left(bd\right)}=0,2.2=0,4\left(mol\right)\)

PTHH: CuO + H₂SO₄ --> CuSO₄ + H₂O

            0,05--->0,05------->0,05

=> n_H2SO4(pư) < n_H2SO4(bd)

=> CuO tan hết

=> m_CuO = 4 (g)

\(\%m_{CuO}=\dfrac{4}{10}.100\%=40\%\)

\(\%m_{Cu}=100\%-40\%=60\%\)

b) \(\left\{{}\begin{matrix}n_{CuSO_4}=0,05\left(mol\right)\\n_{H_2SO_4\left(dư\right)}=0,35\left(mol\right)\end{matrix}\right.\)

=> \(\left\{{}\begin{matrix}C_{M\left(CuSO_4\right)}=\dfrac{0,05}{0,2}=0,25M\\C_{M\left(H_2SO_4.dư\right)}=\dfrac{0,35}{0,2}=1,75M\end{matrix}\right.\)

`n_[Al]=[2,7]/27=0,1(mol)`

`2Al + 6HCl -> 2AlCl_3 + 3H_2 \uparrow`

`0,1`    `0,3`              `0,1`      `0,15`           `(mol)`

`a)V_[H_2]=0,15.22,4=3,36(l)`

`b)V_[dd HCl]=[0,3]/2=0,15(l)`

`=>C_[M_[AlCl_3]]=[0,1]/[0,15]~~0,67(M)`

\(n_{Al}=\dfrac{2,7}{27}=0,1\left(mol\right)\\ pthh:2Al+6HCl\rightarrow2AlCl_3+3H_2\) 
          0,1        0,3            0,1            0,15
\(V_{H_2}=0,15.22,4=3,36\left(l\right)\\ V_{HCl}=\dfrac{0,3}{2}=0,15\left(l\right)\\ C_{M\left(AlCl_3\right)}=\dfrac{0,1}{0,15}=\dfrac{2}{3}M\)