Cho 8.8 game fes tác dụng với 100ml dung dịch hcl 1M tính khối lượng chất rắn và thể tích khí thu được ở đktc
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\(n_{FeS}=\dfrac{8,8}{88}=0,1mol\)
\(FeS+2HCl\rightarrow FeCl_2+H_2S\)
0,1 0,1 0,1 ( mol )
\(V_{H_2S}=0,1.22,4=2,24l\)
\(m_{FeCl_2}=0,1.127=12,7g\)
\(n_{FeS}=\dfrac{8,8}{88}=0,1\left(mol\right)\\
pthh:FeS+2HCl\rightarrow FeCl_2+H_2S\)
0,1 0,1 0,1
\(\left\{{}\begin{matrix}m_{FeCl_2}=127.0,1=12,7\left(g\right)\\V_{H_2S}=0,1.22,4=2,24\left(l\right)\end{matrix}\right.\)
\(a)n_{Fe}=\dfrac{5,6}{56}=0,1mol\\
n_{HCl}=0,5.1=0,5mol\\
Fe+2HCl\rightarrow FeCl_2+H_2\\
\Rightarrow\dfrac{0,1}{1}< \dfrac{0,5}{2}\Rightarrow HCl.dư\\
Fe+2HCl\rightarrow FeCl_2+H_2\)
0,1 0,2 0,1 0,1
\(m_{HCl\left(dư\right)}=\left(0,5-0,2\right).36,5=10,95g\\ b)m_{FeCl_2}=0,1.127=12,7g\\ c)V_{H_2}=0,1.22,4=2,24l\\ d)C_{\%HCl\left(dư\right)}=\dfrac{10,95}{200}\cdot100=5,475\%\\ C_{\%HCl\left(pư\right)}=\dfrac{0,2.36,5}{200}\cdot100=3,65\%\)
\(n_{HCl}=0,1mol\)
\(Fe+2HCl\rightarrow FeCl_2+H_2\)
0,1 0,2 0,1 0,1
\(m_{FeCl_2}=0,1\cdot127=12,7g\)
\(V_{H_2}=0,1\cdot22,4=2,24l\)
1:
a) \(n_{Zn}=\dfrac{13}{65}=0,2\left(mol\right)\)
PTHH: \(Zn+H_2SO_4\rightarrow ZnSO_4+H_2\uparrow\)
______0,2------>0,2------------------->0,2_____(mol)
=> \(V_{H_2}=0,2.22,4=4,48\left(l\right)\)
b) \(V_{ddH_2SO_4}=\dfrac{0,2}{1}=0,2\left(l\right)\)
2:
a)
\(n_{HCl}=2.0,2=0,4\left(mol\right)\)
PTHH: \(Mg+2HCl\rightarrow MgCl_2+H_2\uparrow\)
______0,2<------0,4------------------>0,2______(mol)
=> \(m_{Mg}=0,2.24=4,8\left(g\right)\)
b) \(V_{H_2}=0,2.22,4=4,48\left(l\right)\)
1) $n_{HCl} = 0,1.2 = 0,2(mol)$
$Na_2CO_3 + 2HCl \to 2NaCl + CO_2 + H_2O$
Theo PTHH :
$n_{Na_2CO_3} = \dfrac{1}{2}n_{HCl} = 0,1(mol)$
$V_{dd\ Na_2CO_3} = \dfrac{0,1}{1} = 0,1(lít) = 100(ml)$
2)
$n_{NaCl} = n_{HCl} = 0,2(mol)$
$m_{NaCl} = 0,2.58,5 = 11,7(gam)$
3)
$n_{CO_2} = n_{Na_2CO_3} = 0,1(mol)$
$V_{CO_2} = 0,1.22,4 = 2,24(lít)$
100ml =0,1l
\(n_{HCl}=2.0,1=0,2\left(mol\right)\)
Pt : \(HCl+Na_2CO_3\rightarrow2NaCl+CO_2+H_2O|\)
1 1 2 1 1
0,2 0,2 0,4 0,2
1) \(n_{Na2CO3}=\dfrac{0,2.1}{1}=0,2\left(mol\right)\)
\(V_{ddNa2CO3}=\dfrac{0,2}{1}=0,2\left(l\right)\)
2) \(n_{NaCl}=\dfrac{0,2.2}{1}=0,4\left(mol\right)\)
⇒ \(m_{NaCl}=0,4.58,5=23,4\left(g\right)\)
3) \(n_{CO2}=\dfrac{0,4.1}{2}=0,2\left(mol\right)\)
\(V_{CO2\left(dktc\right)}=0,2.22,4=4,48\left(l\right)\)
Chúc bạn học tốt
a, Ta có: \(n_{Na_2SO_3}=\dfrac{6,3}{126}=0,05\left(mol\right)\)
\(n_{Ca\left(OH\right)_2}=0,1.1=0,1\left(mol\right)\)
PT: \(Na_2SO_3+2HCl\rightarrow2NaCl+H_2O+SO_2\)
_____0,05__________________________0,05 (mol)
Xét tỉ lệ: \(\dfrac{n_{SO_2}}{n_{Ca\left(OH\right)_2}}=0,5< 1\)
⇒ Tạo muối CaSO3.
PT: \(SO_2+Ca\left(OH\right)_2\rightarrow CaSO_3+H_2O\)
____0,05_______________0,05 (mol)
b, \(V_{SO_2}=0,05.22,4=1,12\left(l\right)\)
c, \(m_{CaSO_3}=0,05.120=6\left(g\right)\)
Bạn tham khảo nhé!
a, Ta có: \(n_{Fe}=\dfrac{5,6}{56}=0,1\left(mol\right)\)
\(n_{HCl}=0,5.1=0,5\left(mol\right)\)
PT: \(Fe+2HCl\rightarrow FeCl_2+H_2\)
Xét tỉ lệ: \(\dfrac{0,1}{1}< \dfrac{0,5}{2}\), ta được HCl dư.
Theo PT: \(n_{HCl\left(pư\right)}=2n_{Fe}=0,2\left(mol\right)\Rightarrow n_{HCl\left(dư\right)}=0,5-0,2=0,3\left(mol\right)\)
\(\Rightarrow m_{HCl\left(dư\right)}=0,3.36,5=10,95\left(g\right)\)
b, \(n_{FeCl_2}=n_{Fe}=0,1\left(mol\right)\Rightarrow m_{FeCl_2}=0,1.127=12,7\left(g\right)\)
c, \(n_{H_2}=n_{Fe}=0,1\left(mol\right)\Rightarrow V_{H_2}=0,1.22,4=2,24\left(l\right)\)
d, \(m_{HCl}=0,5.36,5=18,25\left(g\right)\Rightarrow C\%_{HCl}=\dfrac{18,25}{200}.100\%=9,125\%\)
\(a.n_{Fe}=\dfrac{5,6}{56}=0,1mol\\ n_{HCl}=0,5.1=0,5mol\\ Fe+2HCl\rightarrow FeCl_2+H_2\\ \Rightarrow\dfrac{0,1}{1}< \dfrac{0,5}{2}\Rightarrow HCl.dư\\ n_{HCl}=2n_{Fe}=0,2mol\\ m_{HCl\left(dư\right)}=\left(0,5-0,2\right).36,5=10,95\%\\ b)n_{Fe}=n_{FeCl_2}=n_{H_2}=0,1mol\\ m_{FeCl_2}=0,1.12,7g\\ c)V_{H_2}=0,1.22,4=2,24l\\ d)C_{\%HCl}=\dfrac{0,2.36,5}{200}\cdot100=3,65\%\)
\(n_{CaCO3}=\dfrac{15}{100}=0,15\left(mol\right)\)
400ml = 0,4l
\(n_{HCl}=1.0,4=0,4\left(mol\right)\)
a) Pt : \(CaCO_3+2HCl\rightarrow CaCl_2+CO_2+H_2O|\)
1 2 1 1 1
0,15 0,4 0,15 0,15
b) Lập tỉ số so sánh : \(\dfrac{0,15}{1}< \dfrac{0,4}{2}\)
⇒ CaCO3 phản ứng hết , HCl dư
⇒ Tính toán dựa vào số mol của CaCO3
\(n_{HCl\left(dư\right)}=0,4-\left(0,15.2\right)=0,1\left(mol\right)\)
⇒ \(m_{HCl\left(dư\right)}=0,1.36,5=3,65\left(g\right)\)
c) \(n_{CO2}=\dfrac{0,15.1}{1}=0,15\left(mol\right)\)
\(V_{CO2\left(dktc\right)}=0,15.22,4=3,36\left(l\right)\)
d) \(n_{CaCl2}=\dfrac{0,15.1}{1}=0,15\left(mol\right)\)
\(C_{M_{CaCl2}}=\dfrac{0,15}{0,4}=0,375\left(M\right)\)
\(C_{M_{HCl\left(dư\right)}}=\dfrac{0,1}{0,4}=0,25\left(M\right)\)
Chúc bạn học tốt
\(n_{FeS}=\dfrac{8,8}{88}=0,1\left(mol\right)\\ n_{HCl}=0,1.1=0,1\left(mol\right)\)
PTHH: FeS + 2HCl ---> FeCl2 + H2S
LTL: \(0,1>\dfrac{0,1}{2}\) => FeS dư
\(n_{H_2S}=\dfrac{1}{2}n_{HCl}=\dfrac{1}{2}.0,1=0,05\left(mol\right)\\ V_{H_2S}=0,05.22,4=1,12\left(l\right)\)