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

+\(n_{Zn}=\dfrac{32,5}{65}=0,5\left(mol\right)\)

+\(nH_2=n_{Zn}=0,5\left(mol\right)\)

+\(n_{HCl}=2n_{Zn}=1\left(mol\right)\)

+\(V_{H2}=0,5.22,4=11,2\left(lit\right)\)

\(m_{HCl}=1.36,5=36,5\left(gam\right)\)

\(n_{Zn}=\dfrac{m}{M}=\dfrac{32,5}{65}=0,5\left(mol\right)\)

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

\(0,5\) \(mol\)    →   \(1\) ​\(mol\)​    →       \(0,5\)\(mol\)    →   \(0,5\) \(mol\)

\(V_{H_2}=n.22,4=0,5.22,4=11,2\left(l\right)\)

\(m_{HCl}=n.M=1.36,5=36,4\left(g\right)\)

a, \(n_{Zn}=\dfrac{6,5}{65}=0,1\left(mol\right)\)

PTHH: Zn + 2HCl ---> ZnCl₂ + H₂

           0,1--->0,2------->0,1----->0,1

V_H2 = 0,1.22,4 = 2,24 (l)

b, \(C_{M\left(HCl\right)}=\dfrac{0,2}{0,2}=1M\)

c, \(C_{M\left(ZnCl_2\right)}=\dfrac{0,1}{0,2}=0,5M\)

\(n_{Zn}=\dfrac{16.25}{65}=0.25\left(mol\right)\)

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

\(0.25...................0.25.....0.25\)

\(V_{H_2}=0.25\cdot22.4=5.6\left(l\right)\)

\(m_{ZnCl_2}=0.25\cdot136=34\left(g\right)\)

a: Zn+2HCl->ZnCl2+H2 bay lên

b: n Zn=16/64=0,25mol

=>nZnCl2=0,25mol

=>nHCl=0,5mol

=>nH2=0,25mol

V=0,25*22,4=5,6(lít)

c: mHCl=0,5*36,5=18,25g

d: Số phân tử là:

0,25*6,02*10^23=1,505*10^23 phân tử

a) Zn + 2HCl →ZnCl₂  + H₂

b) nZn = 6,5/65 = 0,1 mol . Theo tỉ lệ pư => nH₂ = nZn = nZnCl₂ =0,1 mol <=> V_H2(đktc) = 0,1.22,4 = 2,24 lít.

c) mZnCl₂ = 0,1 . 136 = 13,6 gam

d) nHCl =2nZn = 0,2 mol => mHCl = 0,2.36,5= 7,3 gam

Cách 2: áp dụng định luật BTKL => mHCl = mZnCl₂ + mH₂ - mZn 

<=> mHCl = 13,6 + 0,1.2 - 6,5 = 7,3 gam

a) 

Zn  +  2HCl  →  ZnCl₂   +  H₂ 

b) nZn = \(\dfrac{3,5}{65}\)=\(\dfrac{7}{130}\) mol 

Theo tỉ lệ phản ứng => nH₂ = nZn= \(\dfrac{7}{130}\)mol

<=> V H₂ = \(\dfrac{7}{130}\).22,4 = 1,206 lít

c) nZnCl₂ = nZn => mZnCl₂ = \(\dfrac{7}{130}\).136= 7,32 gam

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

\(n_{Zn}=\dfrac{6,5}{65}=0,1mol\)

b)Theo pt: \(n_{H_2}=n_{Zn}=0,1mol\Rightarrow V_{H_2}=0,1\cdot22,4=2,24l\)

c)\(Và\) \(n_{HCl}=2n_{Zn}=2\cdot0,1=0,2mol\)

\(\Rightarrow m_{HCl}=0,2\cdot36,5=7,3g\)

\(C\%=\dfrac{m_{ct}}{m_{dd}}\cdot100\%\Rightarrow m_{ddHCl}=\dfrac{m_{ct}}{C\%}\cdot100\%=\dfrac{7,3}{7,3\%}\cdot100\%=100g\)