\(n_{CH_4}=\dfrac{2,4}{16}=0,15\left(mol\right)\)

\(\Rightarrow V_{CH_4}=0,15.22,4=3,36\left(lít\right)\)

Chọn C

B

B

B

A

A

A

\(n_{C_2H_5OH}=\dfrac{4,6}{46}=0,1\left(mol\right)\)

PT: \(2C_2H_5OH+2Na\rightarrow2C_2H_5ONa+H_2\)

Theo PT: \(n_{H_2}=\dfrac{1}{2}n_{C_2H_5OH}=0,05\left(mol\right)\)

\(\Rightarrow V_{H_2}=0,05.22,4=1,12\left(l\right)\)

Đáp án: D

\(n_{C_2H_5OH}=\dfrac{4,6}{23}=0,2\left(mol\right)\\ C_2H_5OH+Na\rightarrow C_2H_5ONa+\dfrac{1}{2}H_2\\ n_{H_2}=\dfrac{0,2}{2}=0,1\left(mol\right)\\ V=V_{H_2\left(đktc\right)}=0,1.22,4=2,24\left(l\right)\\ Chọn.A\)

Anh làm lại nãy anh làm sai em hấy!

\(n_{C_2H_5OH}=\dfrac{4,6}{46}=0,1\left(mol\right)\\ C_2H_5OH+Na\rightarrow C_2H_5ONa+\dfrac{1}{2}H_2\\ n_{H_2}=\dfrac{0,1}{2}=0,05\left(mol\right)\\ V_{H_2\left(đktc\right)}=0,05.22,4=1,12\left(l\right)\\ ChọnD\)

\(n_{Zn}=\dfrac{13}{65}=0,2\left(mol\right)\)

PT: \(Zn+2HCl\rightarrow ZnCl_2+H_2\)

Xét tỉ lệ: \(\dfrac{0,2}{1}< \dfrac{0,5}{2}\), ta được HCl dư.

Theo PT: \(n_{H_2}=n_{Zn}=0,2\left(mol\right)\Rightarrow V_{H_2}=0,2.22,4=4,48\left(l\right)\)

Đáp án: D

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

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

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

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

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

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

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

2Na+Cl2-to>2Nacl

0,1----0,05

n Na=0,1 mol

=>VCl2=0,05.22,4=1,12l

=>A

B

b

B

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

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

  0,1        0,3                                    ( mol )

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

=> Chọn C