\(n_{Al2\left(SO4\right)3}=0,1.1=0,1\left(mol\right)\)

Pt : \(2K+2H_2O\rightarrow2KOH+H_2\)

        0,3                      0,3

      \(6KOH+Al_2\left(SO_4\right)_3\rightarrow3K_2SO_4+2Al\left(OH\right)_3\)

         0,3           0,1                 0,15           0,1

a) A : khí H₂ , D : Kết tủa Al(OH)₃

b) Xét tỉ lệ : \(\dfrac{0,3}{6}< \dfrac{0,1}{1}=>Al_2\left(SO_4\right)_3dư\)

\(\Rightarrow m_D=m_{Al\left(OH\right)3}=0,1.78=7,8\left(g\right)\)

c) Dung dịch D gồm : Al₂(SO₄)₃ dư và K₂SO₄

\(C_{MK2SO4}=\dfrac{0,15}{0,1}=1,5\left(M\right)\)

\(C_{MAl2\left(SO4\right)3dư}=\dfrac{0,1-\dfrac{0,3}{6}}{0,1}=0,5\left(M\right)\)

 Chúc bạn học tốt

a)

$K_2SO_4 + BaCl_2 \to BaSO_4 + 2KCl$

b)

$n_{K_2SO_4} = 0,2.2 = 0,4(mol)$
$n_{BaCl_2} = 0,3.1 = 0,3(mol)$

Ta thấy : 

$n_{K_2SO_4} : 1 > n_{BaCl_2} : 1$ nên $K_2SO_4$ dư

$n_{BaSO_4} = n_{BaCl_2} = 0,3(mol)$
$m_{BaSO_4} = 0,3.233 = 69,9(gam)$

c) $n_{K_2SO_4} = 0,4 - 0,3 = 0,1(mol)$

$V_{dd\ sau\ pư} = 0,2 + 0,3 = 0,5(lít)$

$C_{M_{K_2SO_4} } = \dfrac{0,1}{0,5} = 0,2M$
$C_{M_{KCl}} = \dfrac{0,6}{0,5} = 1,2M$

Na2CO3 + CaCl2-----> CaCO3 + 2NaCl

a) Ta có

n\(_{Na2CO3}=0,15.1=0,15\left(mol\right)\)

n\(_{CaCl2}=\)\(0,35.1,2=0,42\left(mol\right)\)

=> CaCl2 dư

Theo pthh

n\(_{NaCO3}=n_{Na2CO3}=0,15\left(mol\right)\)

m\(_{Na2CO3}=0,15.106=15,9\left(g\right)\)

b) Theo pthh

n\(_{CaCl2}=n_{Na2CO3}=0,15\left(mol\right)\)

n dư\(_{CaCL2}=0,42-0,15=0,27\left(mol\right)\)

C\(_{M\left(CaCl2\right)}=\frac{0,27}{0,5}=0,54\left(M\right)\)

Theo pthh

n\(_{NaCl}=2n_{Na2CO3}=0,3\left(mol\right)\)

C\(_{M\left(NaCl\right)}=\frac{0,3}{0,5}=0,6\left(M\right)\)

Chúc bạn học tốt

cho cac axit :HCLO,HNO3,H2S,H2SO3,HNO2,HCLO4,HMno4.so axit manh la

PTHH: \(NaCl+AgNO_3\rightarrow NaNO_3+AgCl\)

a) Ta có: \(\left\{{}\begin{matrix}n_{NaCl}=1\cdot0,1=0,1\left(mol\right)\\n_{AgNO_3}=0,1\cdot0,15=0,015\left(mol\right)\end{matrix}\right.\)

Xét tỷ lệ: \(\frac{0,1}{1}>\frac{0,015}{1}\) \(\Rightarrow\) \(AgNO_3\) p/ứ hết

\(\Rightarrow n_{AgCl}=0,015mol\) \(\Rightarrow m_{AgCl}=0,015\cdot143,5=2,1525\left(g\right)\)

b) Ta có: \(\left\{{}\begin{matrix}n_{NaNO_3}=0,015mol\\n_{NaCl\left(dư\right)}=0,085mol\end{matrix}\right.\)

\(\Rightarrow\left\{{}\begin{matrix}C_{M_{NaNO_3}}=\frac{0,015}{0,25}=0,06\left(M\right)\\C_{M_{NaCl\left(dư\right)}}=\frac{0,085}{0,25}=0,34\left(M\right)\end{matrix}\right.\) (Coi như thể tích dd không đổi)

\(n_{FeCl_3}=\dfrac{48,75}{162,5}=0,3(mol)\\ 3NaOH+FeCl_3\to Fe(OH)_3\downarrow+3NaCl\\ \Rightarrow n_{Fe(OH)_3}=0,3(mol);n_{NaOH}=n_{NaCl}=0,9(mol)\\ a,m_{Fe(OH)_3}=0,3.107=32,1(g)\\ b,m_{dd_{NaOH}}=\dfrac{0,9.40}{10\%}=360(g)\\ c,C\%_{NaCl}=\dfrac{0,9.58,5}{360+48,75-32,1}.100\%=13,98\%\\ \)

\(d,2Fe(OH)_3+3H_2SO_4\to Fe_2(SO_4)_3+6H_2O\\ \Rightarrow n_{H_2SO_4}=0,45(mol)\\ \Rightarrow m_{dd_{H_2SO_4}}=\dfrac{0,45.98}{20\%}=220,5(g)\\ \Rightarrow V_{dd_{H_2SO_4}}=\dfrac{220,5}{1,14}=193,42(ml)\)

\(3NaOH+FeCl_3\rightarrow Fe\left(OH\right)_3+3NaCl\)

\(n_{NaCl}=n_{NaOH}=0,2.3=0,6\left(mol\right)\)

=> \(C_{M\left(NaCl\right)}=\dfrac{0,6}{0,2}=3M\)

\(n_{Fe\left(ỌH\right)_3}=\dfrac{1}{3}n_{NaOH}=0,2\left(mol\right)\)

\(2Fe\left(OH\right)_3-^{t^o}\rightarrow Fe_2O_3+3H_2O\)

Ta có \(n_{Fe_2O_3}=\dfrac{1}{2}n_{Fe\left(OH\right)_3}=0,1\left(mol\right)\)

=> m _Fe2O3 = 0,1 . 160=16(g)

a. PTHH: \(CuSO_4+2NaOH--->Na_2SO_4+Cu\left(OH\right)_2\downarrow\)

b. Đổi 100ml = 0,1 lít

Ta có: \(n_{Cu\left(OH\right)_2}=\dfrac{9,8}{98}=0,1\left(mol\right)\)

Theo PT: \(n_{CuSO_4}=n_{Cu\left(OH\right)_2}=0,1\left(mol\right)\)

=> \(m_{CuSO_4}=0,1.160=16\left(g\right)\)

c. Theo PT: \(n_{NaOH}=2.n_{CuSO_4}=2.0,1=0,2\left(mol\right)\)

=> \(C_{M_{NaOH}}=\dfrac{0,2}{0,1}=2M\)