\(n_{Fe_2O_3}=\dfrac{16}{160}=0,1mol\)

\(Fe_2O_3+3H_2\rightarrow\left(t^o\right)2Fe+3H_2O\)

  0,1        0,3                                    ( mol )

\(V_{H_2}=0,3.22,4=6,72l\)

=> Chọn C

\(n_{CuO}=\dfrac{8}{80}=0,1mol\)

\(CuO+H_2\rightarrow\left(t^o\right)Cu+H_2O\)

0,1         0,1                                  ( mol )

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

=>Chọn A

C2H6O + 3 O2 -to-> 2 CO2 + 3 H2O

nO2=3.nC2H6O=3.1=3(mol)

=>V(O2,đktc)=22,4.3=67,2(l)

=>CHỌN D

b

B

$KHCO_3 + HCl \to KCl + CO_2 + H_2O$
Theo PTHH : 

$n_{CO_2} = n_{KHCO_3} = 3(mol)$
$V_{CO_2} = 3.22,4 = 67,2(lít)$

Đáp án A

\(n_{SO_2}=\dfrac{6,4}{64}=0,1(mol)\\ \Rightarrow V_{SO_2}=0,1.22,4=2,24(l)\)

\(2H_2+O_2\rightarrow\left(t^o\right)2H_2O\\ n_{O_2}=\dfrac{n_{H_2}}{2}\Rightarrow V_{O_2\left(đktc\right)}=\dfrac{V_{H_{2\left(đktc\right)}}}{2}=\dfrac{2,24}{2}=1,12\left(l\right)\\ Chọn.A\)

C

\(C_2H_4 + Br_2 \to C_2H_4Br_2\\ n_{Br_2} = n_{C_2H_4} = \dfrac{2,24}{22,4} = 0,1(mol)\\ V_{dd\ brom} = \dfrac{0,1}{0,1} = 1(lít)\)

Đáp án C

C2H4+Br2→C2H4Br2nBr2=nC2H4=2,2422,4=0,1(mol)Vdd brom=0,10,1=1(lít)

c) 1lít                                                                                   

\(n_{hh}=\dfrac{11.2}{22.4}=0.5\left(mol\right)\)

\(n_{CH_4}=a\left(mol\right),n_{H_2}=b\left(mol\right)\)

\(\Rightarrow a+b=0.5\left(1\right)\)

\(n_{H_2O}=2a+b=\dfrac{12.6}{18}=0.7\left(mol\right)\left(2\right)\)

\(\left(1\right),\left(2\right):a=0.2,b=0.3\)

\(n_{CO_2}=n_{CH_4}=0.2\left(mol\right)\)

\(V=0.2\cdot22.4=4.48\left(l\right)\)