Hóa học

\(n_{HCl}=1.0,2=0,2(mol)\\ PTHH:Mg+2HCl\to MgCl_2+H_2\\ \Rightarrow n_{Mg}=\dfrac{1}{2}n_{HCl}=0,1(mol)\\ \Rightarrow m_{Mg}=0,1.24=2,4(g)\\ \Rightarrow m_{Cu}=10-2,4=7,6(g)\)

1. C

2. D

3. C

4. A

5. D

6. C

7. D

1.

a, \(Natri+sulfuric\:acid\rightarrow Natri\text{ }sulfat+Hidro\)

b, PTHH: \(2Na+H_2SO_4\rightarrow Na_2SO_4+H_2\uparrow\)

Câu 1:

\(a,\) sodium + sulfuric acid ---> sodium sulfate + hydrogen

\(b,2Na+H_2SO_4\to Na_2SO_4+H_2\)

Câu 2:

\(a,\) iron sulfate + barium chloride -----> barium sulfate + iron chloride

\(b,Fe_2\left(SO_4\right)_3+3BaCl_2\to3BaSO_4\downarrow+2FeCl_3\)

CTHH: Cu_xOH_y

\(\dfrac{x}{y}=\dfrac{I}{II}=\dfrac{1}{2}\)

=> CTHH: CuOH₂

\(CTTQ:Cu_x^{II}\left(OH\right)_y^I\\ \Rightarrow x.II=y.I\Rightarrow\dfrac{x}{y}=\dfrac{1}{2}\Rightarrow x=1;y=2\\ \Rightarrow Cu\left(OH\right)_2\\ CTTQ:Ca_x^{II}\left(NO_3\right)_y^I\\ \Rightarrow x.II=y.I\Rightarrow\dfrac{x}{y}=\dfrac{1}{2}\Rightarrow x=1;y=2\\ \Rightarrow Ca\left(NO_3\right)_2\\ CTTQ:Ag_x^I\left(SO_4\right)_y^{II}\\ \Rightarrow x.I=y.II\Rightarrow\dfrac{x}{y}=2\Rightarrow x=2;y=1\\ \Rightarrow Ag_2SO_4\\ CTTQ:Ba_x^{II}\left(PO_4\right)_y^{III}\\ \Rightarrow x.II=y.III\Rightarrow\dfrac{x}{y}=\dfrac{3}{2}\Rightarrow x=3;y=2\\ \Rightarrow Ba_3\left(PO_4\right)_2\\ CTTQ:Fe_x^{III}\left(SO_4\right)_y^{II}\\ \Rightarrow x.III=y.II\Rightarrow\dfrac{x}{y}=\dfrac{2}{3}\Rightarrow x=2;y=3\\ \Rightarrow Fe_2\left(SO_4\right)_3\)

\(CTTQ:Al_x^{III}\left(SO_4\right)_y^{II}\\ \Rightarrow x.III=y.II\Rightarrow\dfrac{x}{y}=\dfrac{2}{3}\Rightarrow x=2;y=3\\ \Rightarrow Al_2\left(SO_4\right)_3\\ CTTQ:\left(NH_4\right)_x^I\left(NO_3\right)_y^I\\ \Rightarrow x.I=y.I\Rightarrow\dfrac{x}{y}=1\Rightarrow x=1;y=1\\ \Rightarrow NH_4NO_3\)

a) CTHH: P_xO_y

\(\dfrac{x}{y}=\dfrac{II}{III}=\dfrac{2}{3}\)

=> CTHH: P₂O₃

b) CTHH: N_xH_y

\(\dfrac{x}{y}=\dfrac{I}{III}=\dfrac{1}{3}\)

=> CTHH: NH₃

c) CTHH: Fe_xO_y

\(\dfrac{x}{y}=\dfrac{II}{II}=\dfrac{2}{2}\)

=> CTHH: FeO

\(n_{O_2}=\dfrac{V}{22,4}=\dfrac{12}{22,4}=\dfrac{15}{28}\left(mol\right)\)

Câu 3:

\(BTKL:m_{CaCO_3}=m_{CO_2}+m_{CaO}\\ m_{CO_2}=m_{CaCO_3}-m_{CaO}=1,32(tấn)\)

Câu 4:

\(a,FeCl_3+3NaOH\to Fe(OH)_3\downarrow+3NaCl\\ b,2Fe(OH)_3\xrightarrow{t^o}Fe_2O_3+3H_2O\\ c,4NH_2+3O_2\xrightarrow{t^o}2N_2+6H_2O\\ d,Na_2CO_3+CaCl_2\to CaCO_3\downarrow+2NaCl\\ e,4Al+3O_2\xrightarrow{t^o}2Al_2O_3\\ f,Fe_2(SO_4)_3+6KOH\to 2Fe(OH)_3\downarrow+3K_2SO_4\)

Câu 5:

\(BTKL:m_{O_2}+m_{Mg}=m_{MgO}\\ \Rightarrow m_{O_2}=m_{MgO}-m_{Mg}=10-6=4(g)\)