\(C_nH_{2n-6}+\dfrac{3n-3}{2}O_2\underrightarrow{^{^{t^0}}}nCO_2+\left(n-3\right)H_2O\)

\(C_nH_{2n+2}O+\dfrac{3n}{2}O_2\underrightarrow{^{^{t^0}}}nCO_2+\left(n+1\right)H_2O\)

$1) C_nH_{2n-6} + \dfrac{3n-3}{2}O_2 \xrightarrow{t^o} n CO_2 + (n - 3) H_2O$

$2) C_nH_{2n+2}O + \dfrac{3n}{2}O_2 \xrightarrow{t^o} nCO_2 + (n + 1)H_2O$

CnH2n-6 +\(\dfrac{3n-3}{2}\)O2 -> nCO2 + (n-3)H2O

CnH2n+2O + \(\dfrac{3n}{2}\)O2 -> nCO2 + (n+1)H2O

1. CnH2n+2 + (3n+1)/2O2 ---> nCO2 + (n+1) H2O

2. CnH2n- 2 + (3n-1)/2O2 ---> nCO2 + (n-1) H2O

3.CnH2n-6 + (2n-3)/2O2 ---> nCO2 + (n-3) H2O

4. CnH2n + 3n/2O2 --> nCO2+ nH2O

Mk chỉ viết hệ số của từng phương trình thôi :

1) 1: ($\frac{3n}{2}$) : n :n

2) 1 : ($\frac{3n+1}{2}$) : n : (n+1)

3) 1 : ($\frac{3n-1}{2}$) :n :(n-1)

4) 1 : ($\frac{3n-3}{2}$) : n : (n-3)

5) 2 : (3n+1) : 2 : (2n+2)

1.\(Fe_xO_y+2yHCl-->xFeCl_{\dfrac{2y}{x}}+yH_2O\)

2.\(2C_xH_y+\left(\dfrac{4x+y}{2}\right)O_2-->2xCO_2+yH_2O\)

3.\(C_nH_{2n}+\dfrac{3n}{2}O_2-->nCO_2+nH_2O\)

4.\(C_nH_{2n+2}+\left(\dfrac{3n+1}{2}\right)O_2-->nCO_2+\left(n+1\right)H_2O\)

5. \(2C_xH_yO_z+\left(\dfrac{4x+y-2z}{2}\right)O_2-->2xCO_2+yH_2O\)

6. (pthh này giống pt 3)

Câu 1: 

a) \(C_4H_9OH+6O_2\xrightarrow[]{t^o}4CO_2+5H_2O\)

b) \(2C_nH_{2n-2}+\left(3n-1\right)O_2\xrightarrow[]{t^o}2nCO_2+\left(2n-2\right)H_2O\)

c) \(2Al+6H_2SO_{4\left(đ\right)}\xrightarrow[]{t^o}Al_2\left(SO_4\right)_3+3SO_2\uparrow+6H_2O\)

Câu 2:

Ta có: \(\left\{{}\begin{matrix}n_{Fe}=\dfrac{11,2}{56}=0,2\left(mol\right)\\n_{Mg}=\dfrac{2,4}{24}=0,1\left(mol\right)\end{matrix}\right.\)

Bảo toàn nguyên tố: \(\left\{{}\begin{matrix}n_{Fe_2O_3}=\dfrac{1}{2}n_{Fe}=0,1\left(mol\right)\\n_{MgO}=n_{Mg}=0,1\left(mol\right)\end{matrix}\right.\)

\(\Rightarrow m_{rắn}=m_{Fe_2O_3}+m_{MgO}=0,1\cdot160+0,1\cdot40=20\left(g\right)\)

Câu 3: 

a) PTHH: \(CuO+H_2\xrightarrow[]{t^o}Cu+H_2O\)  (1)

                \(Fe_2O_3+3H_2\xrightarrow[]{t^o}2Fe+3H_2O\)  (2)

                \(Fe+2HCl\rightarrow FeCl_2+H_2\uparrow\)  (3)

b) Ta có: \(n_{H_2\left(3\right)}=\dfrac{2,24}{22,4}=0,1\left(mol\right)=n_{Fe}\) \(\Rightarrow m_{Cu}=12-0,1\cdot56=6,4\left(g\right)\) \(\Rightarrow n_{Cu}=0,1\left(mol\right)\)

Theo các PTHH: \(\left\{{}\begin{matrix}n_{CuO}=n_{Cu}=0,1\left(mol\right)\\n_{Fe_2O_3}=\dfrac{1}{2}n_{Fe}=0,05\left(mol\right)\end{matrix}\right.\) \(\Rightarrow\left\{{}\begin{matrix}m_{CuO}=0,1\cdot80=8\left(g\right)\\m_{Fe_2O_3}=0,05\cdot160=8\left(g\right)\end{matrix}\right.\)

\(\Rightarrow\%m_{CuO}=\dfrac{8}{8+8}\cdot100\%=50\%=\%m_{Fe_2O_3}\)

c) Theo các PTHH: \(n_{H_2}=n_{CuO}+3n_{Fe_2O_3}=0,1+0,15=0,25\left(mol\right)\)

\(\Rightarrow V_{H_2}=0,25\cdot22,4=5,6\left(l\right)\) 

cân bằng hay s bạn

`2NaOH + CO_2 -> Na_2CO_3 + H_2O`

`BaCO_3 + 2HCl -> BaCl_2 + CO_2 + H_2O`

`3AgNO_3 + K_3PO_4 -> Ag_3PO_4 + 3KNO_3`

`FeS + 2HCl -> FeCl_2 + H_2S`

`Mg(OH)_2 + 2HCl -> MgCl_2 + 2H_2O`

$C_nH_{2n} + \dfrac{3n}{2} O_2 \xrightarrow{t^o} nCO_2 + nH_2O$
$C_nH{2n+2} + \dfrac{3n+1}{2} O_2 \xrightarrow{t^o} nCO_2 + (n+1)H_2O$

`Fe_xO_y + 2yHCl -> FeCl_{2y//x} + yH_2O`

`2M + 2nH_2SO_4 -> M_2(SO_4)_n + nSO_2 + 2nH_2O`