\(n_{H_2SO_4}=0,4\cdot1=0,4mol\)

\(2NaOH+H_2SO_4\rightarrow Na_2SO_4+H_2O\)

 0,8              0,4

\(V_{NaOH}=\dfrac{0,8}{0,5}=1,6l\)

\(n_{H_2SO_4}=0.4\cdot1=0.4\left(mol\right)\)

\(2NaOH+H_2SO_4\rightarrow Na_2SO_4+2H_2O\)

\(0.8.............0.4..............0.4\)

\(V_{dd_{NaOH}}=\dfrac{0.8}{0.5}=1.6\left(l\right)\)

\(V_{dd}=0.4+1.6=2\left(l\right)\)

\(C_{M_{Na_2SO_4}}=\dfrac{0.4}{2}=0.2\left(M\right)\)

1.

a, \(n_{CO_2}=\dfrac{1,12}{22,4}=0,05\left(mol\right)\)

PTHH: CO₂ + 2NaOH → Na₂CO₃ + H₂O

Mol:     0,05       0,1

b, \(C_{M_{ddNaOH}}=\dfrac{0,1}{0,1}=1M\)

2.

a, \(m_{HCl}=200.7,3\%=14,6\left(g\right)\Rightarrow n_{HCl}=\dfrac{14,6}{36,5}=0,4\left(mol\right)\)

PTHH: CuO + 2HCl → CuCl₂ + H₂O

Mol:      0,2         0,4           0,2

b,\(m_{CuO}=0,2.80=16\left(g\right)\)

c, \(C\%_{ddCuCl_2}=\dfrac{0,2.135.100\%}{16+200}=12,5\%\)    

mHCl=200.7,3%=14,6(g)⇒nHCl=14,636,5=0,4(mol)mHCl=200.7,3%=14,6(g)⇒nHCl=14,636,5=0,4(mol)

PTHH: CuO + 2HCl → CuCl₂ + H₂O

Mol:      0,2        0,4          0,2

b,mCuO

nZn=0,1 mol

Zn       +2HCl=> ZnCl2+ H2

0,1 mol =>0,2 mol

=>mHCl=36,5.0,2=7,3g

=>m dd HCl=7,3/14,6%=50g

mdd sau pứ=6,5+50-0,1.2=56,3g

=>C% dd ZnCl2=(0,1.136)/56,3.100%=24,16%

a.b.              Zn         +          2HCl        --->             ZnCl₂            +         H₂   (1)

Theo pt:     65g                     73g                            136g                        2g

Theo đề:    6,5g                   7,3g                            13,6g

=> m_ddHCl=\(\frac{7,3.100}{14,6}=50\left(g\right)\)

c. Từ pt (1), ta có: \(C_{\%}=\frac{13,6}{50+6,5}.100\%=24,1\%\)

\(n_{Zn}=\dfrac{9,75}{65}=0,15mol\)

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

0,15   0,3           0,15      0,15

\(m_{ZnCl_2}=0,15\cdot136=20,4\left(g\right)\)

\(V_{H_2}=0,15\cdot22,4=3,36\left(l\right)\)

\(C_{M_{HCl}}=\dfrac{0,3}{0,1}=3M\)

\(a)Zn+2HCl\rightarrow ZnCl_2+H_2\\ b)n_{Zn}=\dfrac{13}{65}=0,2mol\\ n_{Zn}=n_{ZnCl_2}=n_{H_2}=0,2mol\\ V_{H_2}=0,2.22,4=4,48l\\ c)n_{HCl}=0,2.2=0,4mol\\ C_{M_{HCl}}=\dfrac{0,4}{0,2}=2M\\ d)m_{ZnCl_2}=0,2.136=27,2g\)

a) $CuO + 2HCl \to CuCl_2 + H_2O$
b) $n_{CuO} = \dfrac{1}{2}n_{HCl}  = 0,025(mol)$

$m_{CuO} = 0,025.80 = 2(gam)$

c)

$n_{CuCl_2} = n_{CuO} = 0,025(mol)$
$C_{M_{CuCl_2}} = \dfrac{0,025}{0,05} = 0,5M$

bôi đen chi zợ, bôi trắng ik pn

a, \(Na_2CO_3+2HCl\rightarrow2NaCl+CO_2+H_2O\)

b, \(n_{CO_2}=\dfrac{0,896}{22,4}=0,04\left(mol\right)\)

Theo PT: \(n_{HCl}=2n_{CO_2}=0,08\left(mol\right)\)

\(\Rightarrow C_{M_{HCl}}=\dfrac{0,08}{0,2}=0,4\left(M\right)\)

c, \(n_{Na_2CO_3}=0,04\left(mol\right)\)

\(\Rightarrow\left\{{}\begin{matrix}\%m_{Na_2CO_3}=\dfrac{0,04.106}{10}.100\%=42,4\%\\\%m_{NaCl}=57,6\%\end{matrix}\right.\)

a, \(Zn+2HCl\rightarrow ZnCl_2+H_2\)

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

Theo PT: \(n_{H_2}=n_{Zn}=0,2\left(mol\right)\Rightarrow V_{H_2}=0,2.22,4=4,48\left(l\right)\)

c, \(n_{HCl}=2n_{Zn}=0,4\left(mol\right)\Rightarrow m_{HCl}=0,4.36,5=14,6\left(g\right)\)

\(\Rightarrow m_{ddHCl}=\dfrac{14,6}{10,95\%}=\dfrac{400}{3}\left(g\right)\)

d, \(n_{ZnCl_2}=n_{Zn}=0,2\left(mol\right)\)

Ta có: m _{dd sau pư} = 13 + 400/3 - 0,2.2 = 2189/15 (g)

\(\Rightarrow C\%_{ZnCl_2}=\dfrac{0,2.136}{\dfrac{2189}{15}}.100\%\approx18,64\%\)

a. 

PTHH:

 Zn + 2HCl ---> ZnCl2 + H2

0.2      0.4           0.2       0.2 (mol)

b.

 nZn=13/65=0.2(mol)

 V H2 = 0.2*22.4 = 4.48 (l)

c.

 mHCl=0.4*36.5=14.6(g)

 mddHCl=14.6/10.95*100~133(g)

d.

 mZn=0.2*35.5=7.1(g)

 mZnCl2=0.2*106=21.2(g)

 mH2=0.2*2=0.4(g)

 Theo ĐLBTKL, ta có: 

   mZn + mddHCl = mddZnCl2 + mH2

   7.1 + 133 = mddZnCl2 + 4

 => mddZnCl2= 7.1 + 133 - 4 = 136.1 (g)

   S ZnCl2= 21.2/136.1*100 ~ 15 (g)