\(n_{NO}=a;n_{N_2O}=b\\ BTe:\dfrac{3m}{27}=3a+b\\ a+b=\dfrac{0,896}{22,4}=0,04mol\\ 30a+44b=0,04.20,25.2=1,62\\ \Rightarrow a=0,01;b=0,03\\ m=0,54\)

\(a/Fe+2HCl\xrightarrow[]{}FeCl_2+H_2\\ b/n_{H_2}=n_{FeCl_2}=0,1mol\\ m_{FeCl_2}=0,1.127=12,7\left(g\right)\\ c/V_{H_2}=0,1.22,4=2,24\left(l\right)\\ d/n_{HCl}=0,1.2=0,2\left(mol\right)\\ V_{HCl\left(pư\right)}=\dfrac{0,2}{2}=0,1\left(l\right)\)

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

Còn lại giống câu dưới nha 

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

           0,2            0,1        0,1

\(b,m_{FeCl_2}=0,1.127=12,7\left(g\right)\)

\(c,V_{HCl}=\dfrac{0,2}{2}=0,1\left(l\right)\)

cái này 0,2 anh zai ạ

\(a.MgCl_2->Mg^{2+}+2Cl^{^{ }-};Mg^{^{ }2+}+2OH^{^{ }-}->Mg\left(OH\right)_2\\ FeCl_3->Fe^{^{ }3+}+3Cl^{^{ }-};Fe^{^{ }3+}+3OH^{^{ }-}->Fe\left(OH\right)_3\\ Tạo.Fe\left(OH\right)_3\Rightarrow\left[OH^{^{ }-}\right]\ge\sqrt[3]{\dfrac{10^{-39}}{10^{-3}}}=10^{-12}mol\cdot L^{-1}\left(1\right)\\ Tạo.Mg\left(OH\right)_2\Rightarrow\left[OH^{^{ }-}\right]\ge\sqrt{\dfrac{10^{^{ }-11}}{10^{^{ }-3}}}=10^{^{ }-4}mol\cdot L^{^{ }-1}\left(2\right)\\\left(1\right)< \left(2\right)\Rightarrow Fe\left(OH\right)_3.tạo.trước\\ b.Tạo.Mg\left(OH\right)_2:\left[OH^{^{ }-}\right]=10^{-4}\Rightarrow\left[H^+\right]=10^{-10};pH=10\\ Tạo.Fe\left(OH\right)_3:\left[Fe^{3+}\right]\le10^{-6}mol\cdot L^{-1}\Rightarrow\left[OH^-\right]^3>10^{-33}\Rightarrow\left[H^+\right]< 10^{-3}\Rightarrow pH>3\\ \Rightarrow pH:3< pH< 10 \)

\(m_{HCl}=\dfrac{100.36,5}{100}=36,5\left(g\right)\\ n_{HCl}=\dfrac{36,5}{36,5}=1\left(mol\right)\\ n_{CaCO_3}=\dfrac{10}{100}=0,1\left(mol\right)\\ CaCO_3+2HCl\xrightarrow[]{}CaCl_2+CO_2+H_2O\\ \dfrac{0,1}{1}< \dfrac{1}{2}\Rightarrow HCl.dư\\ n_{CaCO_3}=n_{CaCl_2}=n_{CO_2}=0,1mol\\ m_{CaCl_2}=0,1.111=11,1\left(g\right)\\m_{CO_2}=0,1.44=4,4\left(g\right)\\ m_{ddCaCl_2}=10+100-4,4=105,6\left(g\right)\\ C_{\%CaCl_2}=\dfrac{11,1}{105,6}\cdot100\%\approx10,5\%\)

\(n_{Ca}=\dfrac{5,6}{40}=0,14\left(mol\right)\\ Ca+2H_2O\xrightarrow[]{}Ca\left(OH\right)_2+H_2\\ n_{Ca\left(OH\right)_2}=n_{Ca}=0,14mol\\ m_{Ca\left(OH\right)_2}=0,14.74=10,36\left(g\right)\\ m_{ddCa\left(OH\right)_2}=5,6+100=105,6\left(g\right)\\ C_{\%Ca\left(OH\right)_2}=\dfrac{10,36}{105,6}\cdot100\%\approx9,8\%\)

KL dung dịch không trừ KL H2 à em

Theo đề có:

\(\%_{Cl\left(MCl_x\right)}:\%_{Cl\left(MCl_y\right)}=\dfrac{1}{1,173}\)

\(\Leftrightarrow\dfrac{35,5x}{M+35,5x}:\dfrac{35,5y}{M+35,5y}=\dfrac{1}{1,173}\)

\(\Leftrightarrow\dfrac{35,5x\left(M+35,5y\right)}{35,5y\left(M+35,5x\right)}=\dfrac{1}{1,173}\)

\(\Leftrightarrow1,173x\left(M+35,5y\right)=y\left(M+35,5x\right)\)

\(\Leftrightarrow1,173xM+41,6415xy-yM-35,5xy=0\\ \Leftrightarrow1,173xM+6,1415xy=yM\left(1\right)\)

Lại có:

\(\%_{O\left(MO_{0,5x}\right)}:\%_{O\left(M_2O_y\right)}=1:1,352\)

\(\Leftrightarrow\dfrac{0,5x.16}{M+0,5x.16}:\dfrac{16y}{2M+16y}=1:1,352\)

\(\Leftrightarrow\dfrac{8x\left(2M+16y\right)}{16y\left(M+8x\right)}=\dfrac{1}{1,352}\)

\(\Leftrightarrow21,632xM+173,056xy-16yM-128xy=0\\ \Leftrightarrow21,632xM+45,056xy=16yM\)

\(\Rightarrow1,352Mx+2,816xy=yM\left(2\right)\)

Từ (1), (2) có: \(1,173xM+6,1415xy=1,352xM+2,816xy\)

\(\Leftrightarrow1,173xM+6,1415xy-1,352xM-2,816xy=0\\ \Leftrightarrow-0,179xM=-3,3255xy\\ \Rightarrow M=18,6y\)

Biện luận với y = 3  => M = 56

Thế y = 3 vào (1) được x = 2

=> CTPT của các hợp chất trên: \(FeCl_2,FeCl_3,FeO,Fe_2O_3\)

Lớp 8 rồi ghi đề cho đúng đứng đắn vào:v

\(n_{H_2SO_4}=0,2.1=0,2\left(mol\right)\)

\(Fe+H_2SO_4\rightarrow FeSO_4+H_2\)

0,2<--- 0,2 ----> 0,2 -------> 0,2

\(\%_{m_{Fe}}=\dfrac{56.0,2.100\%}{15,8}=70,89\%\\ \Rightarrow\%_{m_{Cu}}=100\%-70,89\%=29,11\%\)

b

\(V_{H_2}=0,2.22,4=4,48\left(l\right)\)

c

\(FeSO_4+2NaOH\rightarrow Fe\left(OH\right)_2+Na_2SO_4\)

0,2 ------------------------> 0,2

\(m_{Fe\left(OH\right)_2}=0,2.90=18\left(g\right)\)

\(n_{H_2SO_4}=0,2.1=0,2\left(mol\right)\)

PTHH :

\(Fe+H_2SO_4\rightarrow FeSO_4+H_2\uparrow\)

  0,2      0,2          0,2        0,2 

\(m_{Fe}=0,2.56=11,2\left(g\right)\)

\(\%m_{Fe}=\dfrac{11,2}{15,8}.100\%\approx70,89\%\)

\(\%m_{Cu}=100\%-70,89\%\approx29,11\%\)

\(b,V_{H_2}=0,2.22,4=4,48\left(l\right)\)

\(c,FeSO_4+2NaOH\rightarrow Fe\left(OH\right)_2\downarrow+Na_2SO_4\)

 0,2                                0,2 

\(m_{Fe\left(OH\right)_2}=0,2.90=18\left(g\right)\)