\(n_{FeO}=\dfrac{32}{72}=\dfrac{4}{9}\left(mol\right)\)

\(FeO+H_2\underrightarrow{^{t^0}}Fe+H_2O\)

\(\dfrac{4}{9}.....\dfrac{4}{9}....\dfrac{4}{9}\)

\(V_{H_2}=\dfrac{4}{9}\cdot22.4=10\left(l\right)\)

\(m_{Fe}=\dfrac{4}{9}\cdot56=24.89\left(g\right)\)

\(a) n_{FeO} = \dfrac{32}{72} = \dfrac{4}{9}(mol)\\ FeO + H_2 \xrightarrow{t^o} Fe + H_2O\\ n_{Fe} = n_{H_2} = n_{FeO} = \dfrac{4}{9}(mol)\\ V_{H_2} = \dfrac{4}{9}.22,4 = 9,95(lít)\\ b) m_{Fe}= \dfrac{4}{9}.56 = 24,8(gam)\)

\(n_{CuO}=\dfrac{16}{80}=0.2\left(mol\right)\)

\(CuO+H_2\underrightarrow{^{t^0}}Cu+H_2O\)

\(0.2.......0.2......0.2\)

\(V_{H_2}=0.2\cdot22.4=4.48\left(l\right)\)

\(m_{Cu}=0.2\cdot64=12.8\left(g\right)\)

\(2Cu+O_2\underrightarrow{^{t^0}}2CuO\)

\(0.2......0.1\)

\(V_{kk}=5V_{O_2}=5\cdot0.1\cdot22.4=11.2\left(l\right)\)

\(n_{Ag_2O}=\dfrac{23.2}{232}=0.1\left(mol\right)\)

\(Ag_2O+H_2\underrightarrow{^{t^0}}2Ag+H_2O\)

\(0.1......0.1.........0.2\)

\(V_{H_2}=0.1\cdot22.4=2.24\left(l\right)\)

\(m_{Ag}=0.2\cdot108=21.6\left(g\right)\)

\(4Ag+O_2\underrightarrow{^{t^0}}2Ag_2O\)

\(0.2.....0.05\)

\(V_{kk}=5V_{O_2}=5\cdot0.05\cdot22.4=5.6\left(l\right)\)

Fe2O3+3H2-to>2Fe+3H2O

0,2----------0,6------0,4-----0,6 mol

n H2O=\(\dfrac{10,8}{18}\)=0,6 mol

=>VH2=0,6.22,4=13,44l

b)m Fe=0,4.56=22,4g

c) m Fe2O3=0,2.160=32g

\(n_{H_2O}=\dfrac{14,4}{18}=0,8mol\)

\(2Na+2H_2O\rightarrow2NaOH+H_2\)

0,8         0,8             0,8                 ( mol )

\(m_{Na}=0,8.23=18,4g\)

\(m_{NaOH}=0,8.40=32g\)

Số mol của nước là:
n_H2O=14,4/18=0,8(mol)
PTHH: Na+H2O→NaOH+1/2H₂
            0,8    0,8    0,8     0,4   ( mol)
a) Thể tích khí Hidro tạo thành(ĐKTC) là:
V_H2=0,4*22,4=  8,96(l)
b) Khối lượng Natri là:
m_Na=0,8*23 =18,4(g)
Khối lượng Bazơ tạo thành sau phản ứng là:
m_NaOH=0,8*40=32(g)

PTHH: \(Fe+H_2SO_4\rightarrow FeSO_4+H_2\uparrow\)

Ta có: \(n_{Fe}=\dfrac{28}{56}=0,5\left(mol\right)=n_{H_2}=n_{FeSO_4}\)

\(\Rightarrow\left\{{}\begin{matrix}V_{H_2}=0,5\cdot22,4=11,2\left(l\right)\\m_{FeSO_4}=0,5\cdot152=76\left(g\right)\end{matrix}\right.\)

PTHH: \(Fe+2HCl\rightarrow FeCl_2+H_2\uparrow\)

Ta có: \(n_{H_2}=\dfrac{3,36}{22,4}=0,15\left(mol\right)\)

\(\Rightarrow\left\{{}\begin{matrix}n_{HCl}=0,3\left(mol\right)\\n_{FeCl_2}=n_{Fe}=0,15\left(mol\right)\end{matrix}\right.\) \(\Rightarrow\left\{{}\begin{matrix}m_{HCl}=0,3\cdot36,5=10,95\left(g\right)\\m_{Fe}=0,15\cdot56=8,4\left(g\right)\\m_{FeCl_2}=0,15\cdot127=19,05\left(g\right)\end{matrix}\right.\) 

PTHH: 

Ta có: 

PT: Fe2O3+3H2to→2Fe+3H2O

CuO+H2to→Cu+H2O

a, Ta có:  mFe2O3=20.60%=12(g)

⇒nFe2O3=\(\dfrac{12}{160}\)=0,075(mol

mCuO=20−12=8(g

⇒nCuO=\(\dfrac{8}{80}\)=0,1(mol)

Theo pT: 

nFe=2nFe2O3=0,15(mol)

nCu=nCuO=0,1(mol)

⇒mFe=0,15.56=8,4(g)

mCu=0,1.64=6,4(g)

b, Theo PT: nH2=3nFe2O3+nCuO=0,325(mol)

⇒VH2=0,325.22,4=7,28(l)

c. Zn+2HCl->ZnCl2+H2

               0,65----------0,325

=>m HCl=0,65.36,5=23,725g

Ủa bạn cái câu a . 20x60% ( 20 ở đâu vậy bạn