Gọi nCH4 = x (mol), nH2 = y (mol)   (x,y>0)

ta có :
nhỗn hợp = 11,2/22,4 = 0,5 mol

--> x + y = 0,5 (1)

pthh:

CH4 +2O2 ----> CO2 + 2H2O

  x   -->               x     ---> 2x

2H2 + O2 ---> 2H2O

y   --->                y

Lại có: nH2O = 16,2/18 = 0,9 (mol)

----> 2x + y = 0,9 (2)

Từ (1) và (2) ---> x = 0,4            y = 0,1   (mol)

VCH4 = 0,4 . 22,4 = 8,96 l

VH2 = 0,1 . 22,4 = 2,24 l

VCO2 = x.22,4 = 0,4 . 22,4 = 8,96 l

Xong rồi đok

3. a) M_O2/M_N2 = 32/28 = 8/7

b) M_O2/M_CO = 32/28 = 8/7

c) M_O2/M_kk = 32/29

1 tính khối lượng của

a) 0.5 mol Fe2O3

\(M_{Fe_2O_3}=2\times56+3\times16=160\) (g/mol)

\(m_{Fe_2O_3}=n_{Fe_2O_3}\times M_{Fe_2O_3}=0,5\times112=56\left(g\right)\)

b) 0,15 mol CO2

\(M_{CO_2}=1\times12+2\times16=44\) (g/mol)

\(m_{CO_2}=n_{CO_2}\times M_{CO_2}=0,15\times44=6,6\left(g\right)\)

c) 5,6 lít O2 ( điều kiện tiêu chuẩn )

\(n_{O_2}=\frac{V_{O_2}}{22,4}=\frac{5,6}{22,4}=0,25\left(mol\right)\)

\(M_{O_2}=2\times16=32\) (g/mol)

\(m_{O_2}=n_{O_2}\times M_{O_2}=0,25\times32=8\left(g\right)\)

d) 8,96 lít H2 ( điều kiện tiêu chuẩn)

\(n_{H_2}=\frac{V_{H_2}}{22,4}=\frac{8,96}{22,4}=0,4\left(mol\right)\)

\(M_{H_2}=2\times1=2\) (g/mol)

\(m_{H_2}=n_{H_2}\times M_{H_2}=0,4\times2=0,8\left(g\right)\)

2 tính thể tích ( điều kiện tiêu chuẩn)

a) 0,125 mol Cl2

\(V_{Cl_2}=22,4\times n_{Cl_2}=22,4\times0,125=2,8\left(l\right)\)

b) 2,5 mol CH4

\(V_{CH_4}=22,4\times n_{CH_4}=22,4\times2,5=56\left(l\right)\)

c) 6,4 gam 02

\(M_{O_2}=2\times16=32\) (g/mol)

\(n_{O_2}=\frac{m_{O_2}}{M_{O_2}}=\frac{6,4}{32}=0,2\left(mol\right)\)

\(V_{O_2}=22,4\times n_{O_2}=22,4\times0,2=4,48\left(l\right)\)

d) 5,6 gam N2

\(M_{N_2}=2\times14=28\) (g/mol)

\(n_{N_2}=\frac{m_{N_2}}{M_{N_2}}=\frac{5,6}{28}=0,2\left(mol\right)\)

\(V_{N_2}=22,4\times n_{N_2}=22,4\times0,2=4,48\left(l\right)\)

3 tính tỉ khối của khí O2 so với

a) khí N2

\(d_{O_2;N_2}=\frac{M_{O_2}}{M_{N_2}}=\frac{2\times16}{2\times14}=\frac{8}{7}\)

b) khí CO

\(d_{O_2;CO}=\frac{M_{O_2}}{M_{CO}}=\frac{2\times16}{1\times12+1\times16}=\frac{8}{7}\)

c) không khí

\(d_{O_2;kk}=\frac{M_{O_2}}{M_{kk}}=\frac{2\times16}{29}=\frac{32}{29}\)

1. a) m_Fe2O3 = 0,5.160 = 80 (g)

b) m_CO2 = 0,15.44 = 6,6 (g)

c) n_O2 = 5,6/22,4 = 0,25 (mol) => m_O2 = 0,25.32 = 8 (g)

d) n_H2 = 8,96/22,4 = 0,4 (mol) => m_H2 = 0,4.2 = 0,8 (g)

\(nCO2=\dfrac{0.44}{44}=0.01mol\)

\(\Rightarrow V_{CO2}=0.01\times22.4=0.224l\)

\(nH2=\dfrac{0.04}{4}=0.01mol\)

\(\Rightarrow V_{H2}=0.01\times22.4=0.224l\)

=> Tổng thể tích: \(V_{CO2}+V_{H2}=0.224+0.224=0.448\)

\(nCH4=\dfrac{1.12}{22.4}=0.05mol\Rightarrow mCH4=0.05\times16=0.8g\)

\(mO2=0.2\times32=6.4g\)

Tổng khối lượng: mCH4 + mO2 = 0.8 + 6.4 = 7.2g

16 gam khí oxi: n = m : M = 16 : 32 = 0,5 (mol)

V = n.22,4 = 0,5.22,4 = 11,2 (lít)

CH4+2O2-to>CO2+2H2O

0,075---0,15

n O2=\(\dfrac{3,36}{22,4}\)=0,15 mol

=>VCH4=0,075.22,4=1,68l

\(n_{O_2}=\dfrac{3,36}{22,4}=0,15mol\)

\(CH_4+2O_2\rightarrow\left(t^o\right)CO_2+2H_2O\)

 0,075  0,15                                    ( mol )

\(V_{CH_4}=0,075.22,4=1,68l\)

\(n_{O_2}=\dfrac{3,36}{22,4}=0,15mol\)

   CH₄ + 2O₂ \(\underrightarrow{t^o}\) CO₂ + 2H₂O

  0,075    0,15                               ( mol )

\(V_{CH_4}=0,075.22,4=1,68l\)

a, PT: \(CH_4+2O_2\underrightarrow{t^o}CO_2+2H_2O\)

Ta có: \(n_{CH_4}=\dfrac{5,6}{22,4}=0,25\left(mol\right)\)

Theo PT:  \(n_{O_2}=2n_{CH_4}=0,5\left(mol\right)\)

\(\Rightarrow V_{O_2}=0,5.22,4=11,2\left(l\right)\)

b, PT: \(3Fe+2O_2\underrightarrow{t^o}Fe_3O_4\)

Ta có: \(n_{Fe}=\dfrac{16,8}{56}=0,3\left(mol\right)\)

Theo PT: \(n_{O_2}=\dfrac{2}{3}n_{Fe}=0,2\left(mol\right)\)

\(\Rightarrow V_{O_2}=0,2.22,4=4,48\left(l\right)\)

c, PT: \(2H_2+O_2\underrightarrow{t^o}2H_2O\)

Ta có: \(n_{H_2}=\dfrac{3}{2}=1,5\left(mol\right)\)

Theo PT: \(n_{O_2}=\dfrac{1}{2}n_{H_2}=0,75\left(mol\right)\)

\(\Rightarrow V_{O_2}=0,75.22,4=16,8\left(l\right)\)

d, PT: \(4P+5O_2\underrightarrow{t^o}2P_2O_5\)

Ta có: \(n_P=\dfrac{6,2}{31}=0,2\left(mol\right)\)

Theo PT: \(n_{O_2}=\dfrac{5}{4}n_P=0,25\left(mol\right)\)

\(\Rightarrow V_{O_2}=0,25.22,4=5,6\left(l\right)\)