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1 tháng 11 2021

Ta có: \(n_{Fe}=\dfrac{2,24}{56}=0,04\left(mol\right)\)

a. PTHH: Fe + 2HCl ---> FeCl2 + H2

b. Theo PT: \(n_{FeCl_2}=n_{H_2}=n_{Fe}=0,04\left(mol\right)\)

=> \(m_{FeCl_2}=0,04.127=5,08\left(g\right)\)

=> \(V_{H_2}=0,04.22,4=0,896\left(lít\right)\)

c. Theo PT: \(n_{HCl}=2.n_{Fe}=2.0,04=0,08\left(mol\right)\)

=> \(m_{HCl}=0,08.36,5=2,92\left(g\right)\)

Ta có: \(C_{\%_{HCl}}=\dfrac{2,92}{m_{dd_{HCl}}}.100\%=5\%\)

=> \(m_{dd_{HCl}}=58,4\left(g\right)\)

9 tháng 11 2023

\(a)Zn+2HCl\rightarrow ZnCl_2+H_2\\ b)n_{Zn}=\dfrac{13}{65}=0,2mol\\ n_{Zn}=n_{ZnCl_2}=n_{H_2}=0,2mol\\ V_{H_2}=0,2.22,4=4,48l\\ c)n_{HCl}=0,2.2=0,4mol\\ C_{M_{HCl}}=\dfrac{0,4}{0,2}=2M\\ d)m_{ZnCl_2}=0,2.136=27,2g\)

19 tháng 12 2023

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

Ta có: \(n_{Fe}=\dfrac{0,56}{56}=0,01\left(mol\right)\)

Theo PT: \(n_{H_2SO_4}=n_{FeSO_4}=n_{H_2}=n_{Fe}=0,01\left(mol\right)\)

b, \(m_{FeSO_4}=0,01.152=1,52\left(g\right)\)

\(V_{H_2}=0,01.22,4=0,224\left(l\right)\)

c, \(m_{ddH_2SO_4}=\dfrac{0,01.98}{19,6\%}=5\left(g\right)\)

25 tháng 10 2023

a, \(n_{Fe}=\dfrac{11,2}{56}=0,2\left(mol\right)\)

PT: \(Fe+2HCl\rightarrow FeCl_2+H_2\)

Theo PT: \(n_{H_2}=n_{FeCl_2}=n_{Fe}=0,2\left(mol\right)\)

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

b, \(m_{FeCl_2}=0,2.127=25,4\left(g\right)\)

c, \(n_{HCl}=2n_{H_2}=0,4\left(mol\right)\Rightarrow C_{M_{HCl}}=\dfrac{0,4}{0,3}=\dfrac{4}{3}\left(M\right)\)

\(C_{M_{FeCl_2}}=\dfrac{0,2}{0,3}=\dfrac{2}{3}\left(M\right)\)

11 tháng 7 2023

a, PT: \(Fe+H_2SO_4\rightarrow FeSO_4+H_2\)

b, Ta có: \(n_{Fe}=\dfrac{19,6}{56}=0,35\left(mol\right)\)

Theo PT: \(n_{H_2}=n_{Fe}=0,35\left(mol\right)\Rightarrow V_{H_2}=0,35.22,4=7,84\left(l\right)\)

c, \(n_{H_2SO_4}=n_{Fe}=0,35\left(mol\right)\Rightarrow C_{M_{H_2SO_4}}=\dfrac{0,35}{0,2}=1,75\left(M\right)\)

d, \(n_{FeSO_4}=n_{Fe}=0,35\left(mol\right)\Rightarrow m_{FeSO_4}=0,35.152=53,2\left(g\right)\)

e, \(C_{M_{FeSO_4}}=\dfrac{0,35}{0,2}=1,75\left(M\right)\)

d, \(n_{H_2SO_4}=0,25.1,6=0,4\left(mol\right)\)

Xét tỉ lệ: \(\dfrac{n_{Fe}}{1}< \dfrac{n_{H_2SO_4}}{1}\), ta được H2SO4 dư.

Theo PT: \(n_{H_2SO_4\left(pư\right)}=n_{Fe}=0,35\left(mol\right)\)

\(\Rightarrow n_{H_2SO_4\left(dư\right)}=0,4-0,35=0,05\left(mol\right)\)

\(\Rightarrow m_{H_2SO_4\left(dư\right)}=0,05.98=4,9\left(g\right)\)

29 tháng 10 2021

a) $CaSO_3 + 2HCl \to CaCl_2 + SO_2 + H_2O$
b)

$n_{SO_2} = n_{CaSO_3} = \dfrac{12}{120} = 0,1(mol)$
$m_{SO_2} = 0,1.64 = 6,4(gam)$

c)

$n_{HCl} = 2n_{SO_2} = 0,2(mol)$
$\Rightarrow m_{dd\ HCl} = \dfrac{0,2.36,5}{14,6\%} = 50(gam)$

d)

$m_{dd\ sau\ pư} = m_{CaSO_3} + m_{dd\ HCl} - m_{SO_2} = 12 + 50 - 6,4 = 55,6(gam)$

$C\%_{CaCl_2} = \dfrac{0,1.111}{55,6}.100\% = 19,96\%$

29 tháng 10 2021

Ta có: \(n_{CaSO_3}=\dfrac{12}{120}=0,1\left(mol\right)\)

a. PTHH: CaSO3 + 2HCl ---> CaCl2 + H2O + SO2

b. Theo PT: \(n_{SO_2}=n_{CaSO_3}=0,1\left(mol\right)\)

=> \(m_{SO_2}=0,1.64=6,4\left(g\right)\)

c. Theo PT: \(n_{HCl}=2.n_{CaSO_3}=2.0,1=0,2\left(mol\right)\)

=> \(m_{HCl}=0,2.36,5=7,3\left(g\right)\)

Ta có: \(C_{\%_{HCl}}=\dfrac{7,3}{m_{dd_{HCl}}}.100\%=14,6\%\)
=> \(m_{dd_{HCl}}=50\left(g\right)\)

d. Ta có: \(m_{dd_{CaCl_2}}=12+50-0,1.64=55,6\left(g\right)\)

Theo PT: \(n_{CaCl_2}=n_{SO_2}=0,1\left(mol\right)\)

=> \(m_{CaCl_2}=0,1.111=11,1\left(g\right)\)

=> \(C_{\%_{CaCl_2}}=\dfrac{11,1}{55,6}.100\%=19,96\%\)

8 tháng 12 2021

\(a,PTHH:Fe+2HCl\to FeCl_2+H_2\\ b,n_{H_2}=\dfrac{3,36}{22,4}=0,15(mol)\\ \Rightarrow n_{Fe}=0,15(mol)\\ \Rightarrow m_{Fe}=0,15.56=8,4(g)\\ c,n_{HCl}=2n_{H_2}=0,3(mol)\\ \Rightarrow m_{dd_{HCl}}=\dfrac{0,3.36,5}{36,5\%}=30(g)\)

a) PTHH: \(Fe+H_2SO_4\rightarrow FeSO_4+H_2\uparrow\)

b) Ta có: \(n_{Fe}=\dfrac{0,56}{56}=0,01\left(mol\right)=n_{FeSO_4}=n_{H_2}\)

\(\Rightarrow\left\{{}\begin{matrix}m_{FeSO_4}=0,01\cdot152=1,52\left(g\right)\\V_{H_2}=0,01\cdot22,4=0,224\left(l\right)\end{matrix}\right.\)

c) Theo PTHH: \(n_{Fe}=n_{H_2SO_4}=0,01\left(mol\right)\)

\(\Rightarrow m_{ddH_2SO_4}=\dfrac{0,01\cdot98}{19,6\%}=5\left(g\right)\)