a, nFe = 0,56/56 = 0,01 (mol)

PTHH: Fe + H2SO4 -> FeSO4 + H2

Mol: 0,01 ---> 0,01 ---> 0,01 ---> 0,01

mFeSO4 = 0,01 . 152 = 1,52 (g)

VH2 = 22,4 . 0,01 = 0,224 (l)

b, mH2SO4 = 0,01 . 98 = 0,98 (g)

c, mddH2SO4 = 0,98/19,6% = 5 (g)

d, mdd (sau p/ư) = 5 + 0,56 = 5,56 (g)

C%FeSO4 = 1,52/5,56 = 27,33%

a, nFe = 0,56/56 = 0,01 (mol)

PTHH: Fe + H2SO4 -> FeSO4 + H2

Mol: 0,01 ---> 0,01 ---> 0,01 ---> 0,01

mFeSO4 = 0,01 . 152 = 1,52 (g)

VH2 = 22,4 . 0,01 = 0,224 (l)

b, mH2SO4 = 0,01 . 98 = 0,98 (g)

c, mddH2SO4 = 0,98/19,6% = 5 (g)

d, mdd (sau p/ư) = 5 + 0,56 = 5,56 (g)

C%FeSO4 = 1,52/5,56 = 27,33%

a) Số mol CuO và H2SO4 lần lượt là:

nCuO =\(\dfrac{16}{80}\)= 0,02 (mol)

nH2SO4 = \(\dfrac{100.20}{100.98}\) ≃ 0,2 (mol)

Tỉ lệ: nCuO : nH2SO4 = 0,02/1 : 0,2/1 = 0,02 : 0,1

=> H2SO4 dư, tính theo CuO

=> mH2SO4(dư) = n(dư).M = 0,18.98 = 17,64 (g)

PTHH:CuO + H2SO4 -> CuSO4 + H2O

---------0,02-------0,02------0,02----0,02--

=> Có 1,6 g CuO tham gia phản ứng

b) Khối lượng CuSO4 tạo thành là:

mCuSO4 = n.M = 0,02.160 = 3,2 (g)

c) Khối lượng dd sau phản ứng là:

mddspư = mCuO + mddH2SO4 = 1,6 + 100 = 101,6 (g)

Nồng độ phần trăm của axit thu được spư là:

C%H2SO4(dư) = \(\dfrac{17,64}{101,6}\) .100≃ 17,4 %

a) \(n_{CuO}=\dfrac{1,6}{80}=0,02\left(mol\right)\)

\(n_{H_2SO_4}=\dfrac{20\%.100}{98}=\dfrac{10}{49}\left(mol\right)\)

PTHH: CuO + H₂SO₄ --> CuSO₄ + H₂O

Xét tỉ lệ: \(\dfrac{0,02}{1}< \dfrac{\dfrac{10}{49}}{1}\) => CuO hết, H₂SO₄ dư

b)

PTHH: CuO + H₂SO₄ --> CuSO₄ + H₂O

            0,02-->0,02------->0,02

=> \(m_{CuSO_4}=0,02.160=3,2\left(g\right)\)

c) 

m_{dd sau pư} = 1,6 + 100 = 101,6 (g)

\(C\%_{H_2SO_4.dư}=\dfrac{98.\left(\dfrac{10}{49}-0,02\right)}{101,6}.100\%=17,756\%\)

\(a.n_{CuO}=\dfrac{1,6}{80}=0,02\left(mol\right)\\ n_{H_2SO_4}=\dfrac{100.20\%}{98}=\dfrac{10}{49}\left(mol\right)\\ CuO+H_2SO_4\rightarrow CuSO_4+H_2O\\ LTL:\dfrac{0,02}{1}< \dfrac{10}{49}\Rightarrow H_2SO_4dư\\ b.n_{CuSO_4}=n_{Cu}=0,02\left(mol\right)\\ \Rightarrow m_{CuSO_4SS}=0,02.160=3,2\left(g\right)\\ c.m_{ddsaupu}=1,6+100=101,6\left(g\right)\\ n_{H_2SO_4\left(dư\right)}=\dfrac{10}{49}-0,02=\dfrac{451}{2450}\left(mol\right)\\ C\%H_2SO_4\left(dư\right)=\dfrac{\dfrac{451}{2450}.98}{101,6}.100=17,76\%\)

\(n_{BaCl_2}=\dfrac{200.20,8\%}{208}=0,2\left(mol\right)\\ PTHH:BaCl_2+H_2SO_4\rightarrow BaSO_4+2HCl\\ n_{BaSO_4}=n_{H_2SO_4}=n_{BaCl_2}=0,2\left(mol\right)\\ a,m_{kt}=m_{BaSO_4}=233.0,2=46,6\left(g\right)\\ b,C\%_{ddH_2SO_4}=\dfrac{0,2.98}{200}.100\%=9,8\%\)

a)

$Zn + H_2SO_4 \to ZnSO_4 + H_2$
Theo PTHH : 

$n_{H_2} = n_{ZnSO_4} = n_{H_2SO_4} = n_{Zn} = \dfrac{21,6}{65} = 0,33(mol)$
$V_{H_2} = 0,33.22,4 = 7,392(lít)$
b)

$m_{ZnSO_4} = 0,33.161 = 53,13(gam)$
c)

$V_{H_2SO_4} = \dfrac{0,33}{2} = 0,165(lít)$

CuO+H2SO4->CuSO4+H2O

0,02----------------0,02 mol

n CuO=1,6\80=0,02 mol

=>m CuSO4=0,02.160=3,2g

=>thiếu dữ kiện 

Bài này anh có hỗ trợ ở dưới rồi nha em!

nCuO=16/80=0,2(mol)

a) PTHH: CuO + H2SO4 -> CuSO4 + H2O

0,2___________0,2_____0,2(mol)

b) mCuSO4=160.0,2=32(g)

c) KL dung dịch H2SO4 tham gia p.ứ là đề bài cho 100(g)

d) mH2SO4=0,2.98=19,6(g)

=>C%ddH2SO4= (19,6/100).100=19,6%

\(a.Zn+H_2SO_4\rightarrow ZnSO_4+H_2\\ n_{H_2}=\dfrac{4,48}{22,4}=0,2\left(mol\right)\\ n_{Zn}=n_{H_2}=0,2\left(mol\right)\\ \Rightarrow\%m_{Zn}=\dfrac{0,2.65}{25.8}.100=50,39\%\\ \%m_{Cu}=100-50,39=49,61\%\\ b.m_{ddsaupu}=0,2.65+200-0,2.2=212,6\left(g\right)\\ n_{ZnSO_4}=n_{H_2}=0,2\left(mol\right)\\ C\%_{ZnSO_4}=\dfrac{0,2.161}{212,6}.100=15,15\%\)

PTHH: \(2Al+3H_2SO_4\rightarrow Al_2\left(SO_4\right)_3+3H_2\uparrow\)

Ta có: \(\left\{{}\begin{matrix}n_{Al}=\dfrac{4,05}{27}=0,15\left(mol\right)\\n_{H_2SO_4}=\dfrac{294\cdot10\%}{98}=0,3\left(mol\right)\end{matrix}\right.\)

Xét tỉ lệ: \(\dfrac{0,15}{2}< \dfrac{0,3}{3}\) \(\Rightarrow\) Axit còn dư

\(\Rightarrow\left\{{}\begin{matrix}n_{Al_2\left(SO_4\right)_3}=0,075\left(mol\right)=n_{H_2SO_4\left(dư\right)}\\n_{H_2}=0,225\left(mol\right)\end{matrix}\right.\) \(\Rightarrow\left\{{}\begin{matrix}V_{H_2}=0,225\cdot22,4=5,04\left(l\right)\\m_{Al_2\left(SO_4\right)_3}=0,075\cdot342=25,65\left(g\right)\\m_{H_2SO_4\left(dư\right)}=0,075\cdot98=7,35\left(g\right)\\m_{H_2}=0,225\cdot2=0,45\left(g\right)\end{matrix}\right.\)

Mặt khác: \(m_{dd}=m_{Al}+m_{ddH_2SO_4}-m_{H_2}=297,6\left(g\right)\)

\(\Rightarrow\left\{{}\begin{matrix}C\%_{Al_2\left(SO_4\right)_3}=\dfrac{25,65}{297,6}\cdot100\%\approx8,62\%\\C\%_{H_2SO_4\left(dư\right)}=\dfrac{7,35}{297,6}\cdot100\%\approx4,47\%\end{matrix}\right.\)

\(n_{NaOH}=\dfrac{150.8\%}{40}=0,3\left(mol\right)\)

PTHH:

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

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

\(m_{HCl}=0,15.98=14,7\left(g\right)\)

\(m_{ddHCl}=\dfrac{14,7.100}{4,9}=300\left(g\right)\)

\(b,m_{Na_2SO_4}=0,15.142=21,3\left(g\right)\)

\(c,C\%_{Na_2SO_4}=\dfrac{21,3}{150+300}.100\%=4,733\%\)