ai giúp mình với, mình đang ktra huhuhuh

\(m_{H_2SO_4}=\dfrac{19,6\cdot20\%}{100\%}=3,92\left(g\right)\\ \Rightarrow n_{H_2SO_4}=\dfrac{3,92}{98}=0,04\left(mol\right)\\ PTHH:H_2SO_4+BaCl_2\rightarrow BaSO_4\downarrow+2HCl\\ \Rightarrow n_{H_2SO_4}=n_{BaCl_2}=n_{BaSO_4}=0,04\left(mol\right)\\ \Rightarrow m_{CT_{BaCl_2}}=0,04\cdot208=8,32\left(g\right)\\ \Rightarrow m_{dd_{BaCl_2}}=\dfrac{8,32\cdot100\%}{12\%}\approx69,3\left(g\right)\\ m_{kết.tủa}=m_{BaSO_4}=0,04\cdot233=9,32\left(g\right)\)

PTHH: \(BaCl_2+H_2SO_4\rightarrow2HCl+BaSO_4\downarrow\)

Ta có: \(n_{BaCl_2}=\dfrac{208\cdot10\%}{208}=0,1\left(mol\right)\)

\(\Rightarrow\left\{{}\begin{matrix}n_{HCl}=0,2\left(mol\right)\\n_{BaSO_4}=0,1\left(mol\right)=n_{H_2SO_4}\end{matrix}\right.\) \(\Rightarrow\left\{{}\begin{matrix}m_{ddH_2SO_4}=\dfrac{0,1\cdot98}{8\%}=122,5\left(g\right)\\m_{BaSO_4}=0,1\cdot233=23,3\left(g\right)\\m_{HCl}=0,2\cdot36,5=7,3\left(g\right)\end{matrix}\right.\)

Mặt khác: \(m_{dd}=m_{ddBaCl_2}+m_{ddH_2SO_4}-m_{BaSO_4}=307,2\left(g\right)\)

\(\Rightarrow C\%_{HCl}=\dfrac{7,3}{307,2}\cdot100\%\approx2,38\%\)

\(n_{BaCl_2}=\dfrac{208.10\%}{208}=0,1\left(mol\right)\\ a,BaCl_2+H_2SO_4\rightarrow BaSO_4\downarrow+2HCl\\ 0,1............0,1..............0,1.............0,2\left(mol\right)\\ b,m_{ddH_2SO_4}=\dfrac{0,1.98.100}{8}=122,5\left(g\right)\\ c,m_{kt}=m_{BaSO_4}=0,1.233=23,3\left(g\right)\\ d,m_{ddsau}=208+122,5-23,3=307,2\left(g\right)\\ C\%_{ddHCl}=\dfrac{0,2.36,5}{307,2}.100\approx2,376\%\)

Kết tủa là BaSO₄

\(BaCl_2 + H_2SO_4 \rightarrow BaSO_4 + 2HCl\)

\(n_{BaCl_2}= \dfrac{20,8}{208}=0,1 mol\)

Theo PTHH:

\(n_{BaSO_4}= n_{BaCl_2}= 0,1 mol\)

\(\Rightarrow m_{BaSO_4}= 0,1 . 233= 23,3 g\)

Bài 19  :

\(a) n_{Al} = \dfrac{10,8}{27} = 0,4(mol)\\ 2Al + 3H_2SO_4 \to Al_2(SO_4)_3 + 3H_2\\ n_{H_2} = \dfrac{3}{2}n_{Al} = 0,6(mol)\\ V_{H_2} = 0,6.22,4 = 13,44(lít)\\ b) \text{Chất tan : }Al_2(SO_4)_3\\ n_{Al_2(SO_4)_3} = \dfrac{1}{2}n_{Al} = 0,2(mol)\\ m_{Al_2(SO_4)_3} = 0,2.342 = 68,4(gam)\)

Bài 18 : 

\(a) n_{HCl} = \dfrac{250.7,3\%}{36,5 } = 0,5(mol)\\ Zn + 2HCl \to ZnCl_2 + H_2\\ n_{H_2} = \dfrac{1}{2}n_{HCl} = 0,25(mol) \Rightarrow V_{H_2} = 0,25.22,4 = 5,6(lít)\\ b) \text{Chất tan : } ZnCl_2\\ n_{ZnCl_2} = n_{H_2} = 0,25(mol)\\ m_{ZnCl_2} = 0,25.136 = 34(gam)\)

có làm mới có ăn

brruh

đúng là có làm mới cos ăn  nhưng câu này mk vẫn chx hiểu đc á bạn 

2Al+6HCl->2AlCl3+3H2

nHCl=\(\frac{7,3}{36,5}=0,2mol\)

theo PTHH => n Al=n AlCl3=\(\frac{0,2.2}{6}=\frac{1}{15}mol\)

m Al =1/15.27=1,8g

m AlCl3= \(\frac{1}{15}.\left(27+35,5.3\right)=8,9g\)

nAl = 5,4 / 27 = 0,2(mol)

2Al + 3H2SO4--- > Al2(SO4)3 + 3H2

0,2      0,3                0,1                0,3    (mol)

VH2SO4  = n/ CM = 0,3 / 2 = 0,15(l)

=> V1 = 150 ml

mAl2(SO4)3 = 0,1 . 342 = 34,2 (g)

Al2(SO4)3 + 3BaCl2 -- > 3BaSO4 + 2AlCl3

 0,1                                       0,1

=> mBaSO4 = 0,1 . 233 = 23,3 (g)

a) \(\left\{{}\begin{matrix}n_{CuSO_4}=0,3.1=0,3\left(mol\right)\\n_{BaCl_2}=0,1.2=0,2\left(mol\right)\end{matrix}\right.\)

PTHH:           \(CuSO_4+BaCl_2\rightarrow BaSO_4\downarrow+CuCl_2\)

Ban đầu:         0,3           0,2

Sau pư:           0,1            0              0,2             0,2

=> \(m_{kt}=m_{BaSO_4}=0,2.233=46,6\left(g\right)\)

b)             \(CuSO_4+2NaOH\rightarrow Cu\left(OH\right)_2\downarrow+Na_2SO_4\)

                 0,1-------->0,2

                \(CuCl_2+2NaOH\rightarrow Cu\left(OH\right)_2\downarrow+2NaCl\)

                 0,2------>0,4

=> \(m_{ddNaOH}=\dfrac{\left(0,2+0,4\right).40}{15\%}=160\left(g\right)\)