\(n_{Zn}=\dfrac{13}{65}=0,2\left(mol\right)\)

Pt : \(Zn+2HCl\rightarrow ZnCl_2+H_2|\)

        1          2             1           1

       0,2      0,4           0,2         0,2

a) \(n_{HCl}=\dfrac{0,2.2}{1}=0,4\left(mol\right)\)

⇒ \(m_{HCl}=0,4.36,5=14,6\left(g\right)\)

\(C_{HCl}=\dfrac{14,6.100}{100}=14,6\)⁰/₀

b) \(n_{H2}=\dfrac{0,4.1}{2}=0,2\left(mol\right)\)

\(V_{H2\left(dktc\right)}=0,2.22,4=4,48\left(l\right)\)

\(n_{ZnCl2}=\dfrac{0,2.1}{1}=0,2\left(mol\right)\)

⇒ \(m_{ZnCl2}=0,2.136=27,2\left(g\right)\)

c) \(n_{HCl}=\dfrac{36,5}{36,5}=1\left(mol\right)\)

Pt : \(Zn+2HCl\rightarrow ZnCl_2+H_2|\)

        1          2              1        1

      0,2         1              0,2

Lập tỉ số so sánh : \(\dfrac{0,2}{1}< \dfrac{1}{2}\)

           ⇒ Zn phản ứng hết , Hcl dư

          ⇒ Tính toán dựa vào số mol của Zn

\(n_{ZnCl2}=\dfrac{0,2.1}{1}=0,2\left(mol\right)\)

⇒ \(m_{ZnCl2}=0,2.136=27,2\left(g\right)\)

\(n_{HCl\left(dư\right)}=1-\left(0,2.2\right)=0,6\left(mol\right)\)

⇒ \(m_{HCl\left(dư\right)}=0,6.36,5=14,6\left(g\right)\)

 Chúc bạn học tốt

a, Ta có: n_Zn=\(\dfrac{13}{65}\)=0,2 mol

Zn + 2HCl ---> ZnCl₂ + H₂

Ta có: n_Zn=\(\dfrac{1}{2}\)n_HCl => n_HCl=0,1 mol

=> m_HCl=0,1.36,5=3,65 g

=> a%=\(\dfrac{3,65.100}{100}\)=3,65%

b, Ta có: n_Zn=n_ZnCl2 = n_H2= 0,2 mol

=> V_H2=0,2.22,4=4,48 l

=> m_ZnCl2=0,2.136=27,2 g

c, Zn + 2HCl ---> ZnCl₂ + H₂

Ta có: n_HCl=\(\dfrac{36.5}{36.5}\)=1 mol

Ta có: \(\dfrac{n_{HCl}}{n_{Zn}}=\dfrac{1}{0,2}\) => HCl dư tính theo Zn

Ta có: n_Zn=n_ZnCl2 = n_H2= 0,2 mol

=> V_H2=0,2.22,4=4,48 l

=> m_ZnCl2=0,2.136=27,2 g

Zn + 2HCl ---> ZnCl2 + H2 

0.2-→0.4------→0.2--→0.2 (mol)

nZn = 11,2\56 = 0.2(mol)

mZnCl2 = n*M = 0.2*127 = 25.4(g)

VH2(đktc) = n*22.4 = 0.2*22.4 = 4.48(l)

mHCl = n*M = 0.4*36.5 = 14.6(g)

C% =14,6\146*100% = 10(%)

\(a.Zn+2HCl\rightarrow ZnCl_2+H_2\\ b.n_{Zn}=\dfrac{11,2}{65}=0,17\left(mol\right)\\ TheoPT:n_{ZnCl_2}=n_{H_2}=n_{Zn}=0,17\left(mol\right)\\ m_{ZnCl_2}=0,17.136=23,12\left(g\right)\\ V_{H_2}=0,17.22,4=3,808\left(l\right)\\ c.n_{HCl}=2n_{Zn}=0,34\left(mol\right)\\ C\%_{HCl}=\dfrac{0,34.36,5}{146}.100=8,5\%\)

a) PTHH: \(Zn+2HCl\rightarrow ZnCl_2+H_2\)

b) \(n_{ZnCl_2}=\dfrac{20,4}{136}=0,15\left(mol\right)\)

\(n_{H_2}=n_{ZnCl_2}=0,15\left(mol\right)\)

\(V_{H_2\left(đktc\right)}=0,15.22,4=3,36\left(l\right)\)

c) \(m_{H_2}=0,15.2=0,3\left(g\right)\)

\(n_{HCl}=2n_{H_2}=0,3\left(mol\right)\)

\(m_{HCl}=0,3.36,5=10,95\left(g\right)\)

\(m_{Zn}=20,4+0,3-10,95=9,75\left(g\right)\)

\(n_{Zn}=\dfrac{13}{65}=0,2(mol)\\ a,PTHH:Zn+2HCl\to ZnCl_2+H_2\\ b,n_{HCl}=2n_{Zn}=0,4(mol)\\ \Rightarrow m_{HCl}=0,4.36,5=14,6(g)\\ c,n_{H_2}=n_{Zn}=0,2(mol)\\ \Rightarrow V_{H_2}=0,2.22,4=4,48(l)\)

b) mHCl = 14,6 (g)

V H2 = 4,48 (l)

Giải thích các bước:

a) PTHH:  Zn +  2HCl → ZnCl2 + H2↑

b) nZn = 13 : 65 = 0,2 mol

Theo PTHH: nHCl = 2.nZn = 0,4 mol

mHCl = 0,4 . 36,5 = 14,6(g)

c) nH2 = nZn = 0,2 mol

VH2 = 0,2 . 22,4 = 4,48 (l)

Bài 3 :

a. \(n_{Zn}=\dfrac{13}{65}=0,2\left(mol\right)\)

PTHH : Zn + 2HCl -> ZnCl₂ + H₂

           0,2                      0,2       0,2

b. \(m_{ZnCl_2}=0,2.136=27,2\left(g\right)\)  

c. PTHH : CuO + H₂ ----t^o----> Cu + H₂O

                           0,2                   0,2

\(m_{Cu}=0,2.64=12,8\left(g\right)\)

Bài 4 :

a. \(n_{Mg}=\dfrac{4.8}{24}=0,2\left(mol\right)\)

PTHH : Mg + 2HCl -> MgCl₂ + H₂

            0,2                 0,2          0,2

b. \(m_{MgCl_2}=0,2.95=19\left(g\right)\)

c.  PTHH : CuO + H₂ ----t^o----> Cu + H₂O

                           0,2                   0,2

\(m_{Cu}=0,2.64=12,8\left(g\right)\)

Bài 5 :

a. \(n_{O_2}=\dfrac{6.72}{22,4}=0,3\left(mol\right)\)

PTHH : 2KClO₃ ----t^o----> 2KCl + 3O₂

\(n_{KClO_3}=\dfrac{0,3.2}{3}=0,2\left(mol\right)\\ \Rightarrow m_{KClO_3}=0,2.122,5=24,5\left(g\right)\)

c. PTHH : 4P + 5O₂ ----t^o----> 2P₂O₅ 

                        0,2                      0,08

\(m_{P_2O_5}=0,08.142=11,36\left(g\right)\)

a)

\(Zn + 2HCl \to ZnCl_2 + H_2\\ n_{ZnCl_2} = n_{H_2} = n_{Zn} = \dfrac{19,5}{65} =0,3(mol)\\ V_{H_2} = 0,3.22,4 = 6,72(lít)\\ b) m_{ZnCl_2} = 0,3.136 = 40,8(gam)\\ c) n_{HCl} = 2n_{Zn} = 0,6(mol) \Rightarrow V_{dd\ HCl} = \dfrac{0,6}{2} = 0,3(lít)\\ d) 2H_2 + O_2 \xrightarrow{t^o} 2H_2O\\ V_{O_2} = \dfrac{1}{2} V_{H_2} = 3,36(lít)\\ V_{không\ khí} = \dfrac{V_{O_2}}{20\%}= \dfrac{3,36}{20\%} = 16,8(lít)\)

a)

\(Zn + 2HCl \to ZnCl_2 + H_2\)

b),c)

Theo PTHH :

\(n_{ZnCl_2} = n_{H_2} = n_{Zn} = \dfrac{13}{65} = 0,2(mol)\)

Vậy : 

\(m_{ZnCl_2} = 0,2.136 = 27,2(gam)\\ V_{H_2} =0,2.22,4 = 4,48(lít)\)

a) PTHH: \(Zn+2HCl\rightarrow ZnCl_2+H_2\uparrow\)

b+c)

Ta có: \(n_{Zn}=\dfrac{13}{65}=0,2\left(mol\right)=n_{ZnCl_2}=n_{H_2}\)

\(\Rightarrow\left\{{}\begin{matrix}m_{ZnCl_2}=0,2\cdot136=27,2\left(g\right)\\V_{H_2}=0,2\cdot22,4=4,48\left(l\right)\end{matrix}\right.\)

a) Zn + 2HCl --> ZnCl₂ + H₂

b) \(n_{ZnCl_2}=\dfrac{13,6}{136}=0,1\left(mol\right)\)

PTHH: Zn + 2HCl --> ZnCl₂ + H₂

           0,1<-----------0,1----->0,1

=> m_Zn = 0,1.65 = 6,5 (g)

b) V_H2 = 0,1.22,4 = 2,24 (l)

\(Zn+2HCl\rightarrow ZnCl_2+H_2\)

Áp dung định luật BTKL : 

\(m_{H_2}=13+14.6-27.2=0.4\left(g\right)\)

\(n_{H_2}=\dfrac{0.4}{2}=0.2\left(mol\right)\)

\(V_{H_2}=0.2\cdot22.4=4.48\left(l\right)\)

\(Mg+2HCl\rightarrow MgCl_2+H_2\)

Áp dụng định luật BTKL : 

\(m_{Mg}+m_{HCl}=m_{MgCl_2}+m_{H_2}\)

\(\Rightarrow m_{Mg}=9.5+0.2-7.3=2.4\left(g\right)\)

\(n_{H_2}=\dfrac{0.2}{2}=0.1\left(mol\right)\)

\(V_{H_2}=0.1\cdot22.4=2.24\left(l\right)\)