Em cảm ơn anh nhiều lắm

\(n_{Fe_3O_4}=\dfrac{m}{M}=\dfrac{6,96}{56\cdot3+16\cdot4}=0,03\left(mol\right)\\ PTHH;3Fe+2O_2-^{t^o}>Fe_3O_4\)

tỉ lệ:      3         :  2       :     1

n(mol)   0,09<-----0,06<---0,03

\(m_{Fe}=n\cdot M=0,09\cdot56=5,04\left(g\right)\\ V_{O_2\left(dktc\right)}=n\cdot22,4=0,06\cdot22,4=1,344\left(l\right)\)

0,03 mol anh ơi

$n_P = \dfrac{6,2}{31} = 0,2(mol)$
$4P + 5O_2 \xrightarrow{t^o} 2P_2O_5$
$n_{P_2O_5} = \dfrac{1}{2}n_P = 0,1(mol)$
$m_{P_2O_5} = 0,1.142 = 14,2(gam)$

`n_(FeO) = m/M=(7,2)/(56+16)=0,1(mol)`

\(PTHH:FeO+H_2-^{t^o}>Fe+H_2O\)

tỉ lệ:         1        :    1    :     1   :    1

n(mol)      0,1---->0,1--->0,1----->0,1

\(m_{Fe}=n\cdot M=0,1\cdot56=5,6\left(g\right)\\ V_{H_2\left(dktc\right)}=n\cdot22,4=0,1\cdot22,4=2,24\left(l\right)\)

a) $n_{FeO} = \dfrac{7,2}{72} = 0,1(mol)$
$FeO + H_2 \xrightarrow{t^o} Fe + H_2O$
$n_{Fe} = n_{FeO} = 0,1(mol)$
$\Rightarrow m_{Fe} = 0,1.56 = 5,6(gam)$

b) $n_{H_2} = n_{FeO} = 0,1(mol)$
$V_{H_2} = 0,1.22,4 = 2,24(lít)$

Câu 1 : 

$n_C = \dfrac{4,8}{12} = 0,4(mol) ; n_{O_2} = \dfrac{7,437}{24,79} = 0,3(mol)$$
$C + O_2 \xrightarrow{t^o} CO_2$

Ta thấy : 

$n_C : 1 > n_{O_2} : 1$ nên C dư

$n_{C\ pư} = n_{O_2} = 0,3(mol) \Rightarrow m_{C\ dư} = (0,4 - 0,3).12 = 1,2(gam)$
$\Rightarorw V_{CO_2} = V_{O_2} = 7,437(lít)$

Câu 2 : 

$n_{Mg} = \dfrac{2,4}{24} = 0,1(mol)$
$n_{Cl_2} = \dfrac{9,916}{24,79} = 0,4(mol)$
$Mg + Cl_2 \xrightarrow{t^o} MgCl_2$
Ta thấy : 

$n_{Mg} : 1 < n_{Cl_2} : 1$ nên $Cl_2$ dư

$n_{Cl_2\ pư} = n_{Mg} = 0,1(mol) \Rightarrow m_{Cl_2\ dư} = (0,4 - 0,1).71 = 21,3(gam)$

$n_{MgCl_2}= n_{Mg} = 0,1(mol) \Rightarrow m_{MgCl_2} = 0,1.95 = 9,5(gam)$

a) $CaCO_3 \xrightarrow{t^o} CaO + CO_2$
b) 1 tấn = 1000 kg

$m_{CaCO_3} = 1000.95\% = 950(kg)$

$m_{tạp\ chất} = 1000 - 950 = 50(kg)$

$n_{CaO} = n_{CaCO_3} = 9,5(kmol)$

$\Rightarrow m_{chất\ rắn} = 9,5.56 + 50 = 582(kg)$

a)

$CuO + H_2 \xrightarrow{t^o} Cu + H_2O$
$Fe_2O_3 + 3H_2 \xrightarrow{t^o} 2Fe + 3H_2O$
$ZnO + H_2 \xrightarrow{t^o} Zn + H_2O$

b) Theo PTHH : 

$n_{H_2O} = n_{H_2} = a(mol)$

Bảo toàn khối lượng : $32,1 + 2a = 24,1 + 18a$
$\Rightarrow a = 0,5(mol)$

$\Rightarrow V_{H_2} = 0,5.22,4 = 11,2(lít)$

1) Đặt CTPT của ankan là \(C_nH_{2n+2}\left(n\in N;n\ge1\right)\)

\(\Rightarrow\dfrac{12n}{14n+2}.100\%=84\%\Leftrightarrow n=7\left(t/m\right)\)

Vậy ankan là C₇H₁₆

2) Đặt CTPT của X là \(C_nH_{2n+2}\left(n\in N;n\ge1\right)\)

\(\Rightarrow\dfrac{2n+2}{14n+2}.100\%=17,24\%\Leftrightarrow n=4\left(t/m\right)\)

Vậy X là C₄H₁₀

3) Đặt CTPT của X là \(C_nH_{2n+2}\left(n\in N;n\ge1\right)\)

\(\Rightarrow\dfrac{12n}{2n+2}=\dfrac{36}{7}\Leftrightarrow n=6\left(t/m\right)\)

Vậy X là C₆H₁₄

4) Đặt CTPT của X là \(\left(CH_3\right)_n\left(n\in N;n\ge1\right)\)

\(\Rightarrow3n=2n+2\Leftrightarrow n=2\left(t/m\right)\)

Vẫy X là C₂H₆

5) \(n_{ankan}=\dfrac{P.V}{R.T}=\dfrac{2.2,464}{0,082.\left(27,3+273\right)}=0,2\left(mol\right)\)

\(\Rightarrow M_{ankan}=\dfrac{14,4}{0,2}=72\left(g/mol\right)\)

Đặt CTPT của X là \(C_nH_{2n+2}\left(n\in N,n\ge1\right)\)

\(\Rightarrow14n+2=72\Leftrightarrow n=5\left(t/m\right)\)

Vậy X là C₅H₁₂

6) \(n_A=n_{O_2}=\dfrac{0,64}{32}=0,02\left(mol\right)\)

\(\Rightarrow M_A=\dfrac{0,88}{0,02}=44\left(g/mol\right)\)

Đặt CTPT của A là \(C_nH_{2n+2}\left(n\in N;n\ge1\right)\)

\(\Rightarrow14n+2=44\Leftrightarrow n=3\left(t/m\right)\)

Vậy A là C₃H₈

a)

\(4Al+3C\xrightarrow[]{1500-1700^oC}Al_4C_3\\ Al_4C_3+12H_2O\rightarrow4Al\left(OH\right)_3\downarrow+3CH_4\uparrow\\ CH_4+Cl_2\xrightarrow[]{a/s}CH_3Cl+HCl\\ CH_3Cl+Cl_2\xrightarrow[]{a/s}CH_2Cl_2+HCl\\ CH_2Cl_2+Cl_2\xrightarrow[]{a/s}CHCl_3\\ CHCl_3+Cl_2\xrightarrow[]{a/s}CCl_4+HCl\)

b)

\(CH_3COOH+NaOH\rightarrow CH_3COONa+H_2O\\ CH_3COONa+NaOH\xrightarrow[]{CaO,t^o}CH_4\uparrow+Na_2CO_3\)

\(CH_4+Cl_2\xrightarrow[]{a/s}CH_3Cl+HCl\\ 2CH_3Cl+2Na\xrightarrow[]{t^o}2NaCl+C_2H_6\\ C_2H_6\xrightarrow[]{t^o,xt}C_2H_4\)

c)

\(C_4H_{10}\xrightarrow[]{crackinh}C_2H_6+C_2H_4\\ C_2H_6+Cl_2\xrightarrow[]{a/s}C_2H_5Cl+HCl\\ 2C_2H_5Cl+2Na\xrightarrow[]{t^o,xt}C_4H_{10}+2NaCl\\ C_4H_{10}\xrightarrow[]{crackinh}CH_4+C_3H_6\\ C_3H_6+H_2\xrightarrow[]{Ni,t^o}C_3H_8\)

a) \(CH_3-CH_2-C\left(CH_3\right)_2-CH\left(C_2H_5\right)-CH_2-CH_3\)

b) \(CH_2Br-CHCl-CH\left(CH_3\right)-CH_2-CH_3\)

c) \(CH_2Cl-CCl\left(CH_3\right)-CH_2-CH_2-CH_2-CH_3\)

d) \(CH_3-CH\left(CH_3\right)-CH_2-CH_3\)