16 nCO2=0,2mol

PTHH: 2CO+O2=>2CO2

         0,2<--0,1<---0,2

=> mO2=0,2.32=6,4g

=> khối lượng Oxi phản ứng với H2 là :

9,6-6,4=3,2g

=> nH2O=3,2:32=0,1mol

PTHH: 2H+O2=>H2O

b)

           0,2<-0,1<-0,2

=> mH2=2.0,2=0,4g

mCO =0,2.28=5,6g

=> m hh=5,6+0,4=6g

CuO+H2-to--->Cu+H2O 

0,6----0,6
nCuO =48/80=0,6 (mol)
==>VH2 =0,6×22,4=13.44(l)

17.

\(n_{Fe}=\dfrac{5,6}{56}=0,1mol\)

\(m_{H_2SO_4}=200.19,6\%=39,2g\)

\(n_{H_2SO_4}=\dfrac{39,2}{98}=0,4mol\)

\(Fe+H_2SO_4\rightarrow FeSO_4+H_2\)

0,1 <   0,4                                 ( mol )

0,1       0,1              0,1        0,1   ( mol )

\(V_{H_2}=0,1.22,4=2,24l\)

Chất còn dư là H2SO4

\(m_{H_2SO_4\left(dư\right)}=\left(0,4-0,1\right).98=29,4g\)

\(\left\{{}\begin{matrix}m_{FeSO_4}=0,1.152=15,2g\\m_{H_2}=0,1.2=0,2g\end{matrix}\right.\)

\(m_{ddspứ}=5,6+200-0,1.2=205,4g\)

\(\left\{{}\begin{matrix}C\%_{FeSO_4}=\dfrac{15,2}{205,4}.100=7,4\%\\C\%_{H_2}=\dfrac{0,2}{205,4}.100=0,09\%\\C\%_{H_2SO_4\left(dư\right)}=\dfrac{29,4}{205,4}.100=14,31\%\end{matrix}\right.\)

\(n_{Fe}=\dfrac{5,6}{56}=0,1\left(mol\right)\)
\(m_{H_2SO_4}=\dfrac{200.19,6}{100}=39,2\left(g\right)\)
\(n_{H_2SO_4}=\dfrac{39,2}{98}=0,4\left(mol\right)\)
pthh : \(Fe+H_2SO_4->FeSO_4+H_2\)
 LTL: 
\(\dfrac{0,1}{1}< \dfrac{0,4}{1}\)
=> H2SO4 dư 
=> \(n_{H_2}=0,1mol\)
=> \(V_{H_2}=0,1.22,4=2,24\left(L\right)\)
theo pthh :\(n_{H_2SO_4\left(p\text{ư}\right)}=n_{Fe}=0,1\left(mol\right)\)
=> \(n_{H_2SO_4\left(d\right)}=0,4-0,1=0,3\left(mol\right)\)
=> \(m_{H_2SO_4}=98.0,3.29,4\left(g\right)\)
ta có mdd =5,6+39,2 = 44,8 (g)
\(C\%=\dfrac{5,6}{44,8}.100\%=12,55\)

C

nCuO = 48/80 = 0,6 (mol)

PTHH: CuO + H2 -> (t°) Cu + H2O

Mol: 0,6 ---> 0,6

VH2 = 0,6 . 22,4 = 13,44 (l)

=> B

C

Ta có: \(n_{CuO}=\dfrac{48}{80}=0,6\left(mol\right)\)

PT: \(CuO+H_2\underrightarrow{t^o}Cu+H_2O\)

___0,6___0,6__0,6 (mol)

a, m_Cu = 0,6.64 = 38,4 (g)

b, V_H2 = 0,6.22,4 = 13,44 (l)

Bạn tham khảo nhé!

Câu 24:

\(V_{H_2}=0,125.22,4=2,8\left(l\right)\)

→ Đáp án: D

Câu 25:

\(n_{CuO}=\dfrac{40}{80}=0,5\left(mol\right)\)

PT: \(CuO+H_2\underrightarrow{t^o}Cu+H_2O\)

Theo PT: \(n_{H_2}=n_{CuO}=0,5\left(mol\right)\) \(\Rightarrow V_{H_2}=0,5.22,4=11,2\left(l\right)\)

→ Đáp án: B

Câu 26:

\(m_{ZnO}=0,5.81=40,5\left(g\right)\)

→ Đáp án: A

Câu 27: B

Câu 28: B

CuO+H2-to>Cu+H2O

0,15--0,15-------0,15

n CuO=\(\dfrac{12}{80}\)=0,15 mol

=>m Cu=0,15.64=9,6g

=>VH2=0,15.22,4=3,36l

a) n Fe = 16,8/56 = 0,3(mol)

$Fe_2O_3 + 3H_2 \xrightarrow{t^o} 2Fe + 3H_2O$

n H2 = 3/2 n Fe = 0,45(mol)

=> V H2 = 0,45.22,4 = 10,08(lít)

b)

$Fe + 2HCl \to FeCl_2 + H_2$

n HCl = 2n Fe = 0,6(mol)

=> m HCl = 0,6.36,5 = 21,9 gam

C

8g

13C
14 8g ạ 

Đáp án đúng : A