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a)
$Fe + 2HCl \to FeCl_2 + H_2$
b) Theo PTHH : $n_{Fe} = n_{H_2} = \dfrac{3,36}{22,4} = 0,15(mol)$
$m_{Fe} = 0,15.56 = 8,4(gam)$
c) $n_{HCl} = 2n_{H_2} = 0,3(mol)$
$\Rightarrow C_{M_{HCl}} = \dfrac{0,3}{0,05} = 6M$
d) $2NaOH + H_2SO_4 \to Na_2SO_4 + 2H_2O$
$n_{H_2SO_4} = \dfrac{1}{2}n_{NaOH} = 0,25(mol)$
$m_{dd\ H_2SO_4} = \dfrac{0,25.98}{20\%} = 122,5(gam)$
$V_{dd\ H_2SO_4} = \dfrac{122,5}{1,14} = 107,5(ml)$
\(n_{H2}=\dfrac{3,36}{22,4}=0,15\left(mol\right)\)
a) Pt : \(Fe+2HCl\rightarrow FeCl_2+H_2|\)
1 2 1 1
0,15 0,3 0,15
b) \(n_{Fe}=\dfrac{0,15.1}{1}=0,15\left(mol\right)\)
⇒ \(m_{Fe}=0,15.56=8,4\left(g\right)\)
c) \(n_{HCl}=\dfrac{0,15.2}{1}=0,3\left(mol\right)\)
50ml = 0,05l
\(C_{M_{ddHCl}}=\dfrac{0,3}{0,05}=6\left(M\right)\)
Chúc bạn học tốt
\(n_{H2}=\dfrac{3,36}{22,4}=0,15\left(mol\right)\)
Pt : \(Fe+2HCl\rightarrow FeCl_2+H_2|\)
1 2 1 1
0,15 0,3 0,15
\(n_{Fe}=\dfrac{0,15.1}{1}=0,15\left(mol\right)\)
⇒ \(m_{Fe}=0,15.56=8,4\left(g\right)\)
\(n_{HCl}=\dfrac{0,15.2}{1}=0,3\left(mol\right)\)
50ml = 0,05l
\(C_{M_{HCl}}=\dfrac{0,3}{0,05}=6\left(M\right)\)
Chúc bạn học tốt
a) \(n_{H_2}=\dfrac{3,36}{22,4}=0,15\left(mol\right)\)
PTHH: Fe + 2HCl --> FeCl2 + H2
____0,15<--0,3<-------------0,15
=> mFe = 0,15.56 = 8,4 (g)
b) \(C_{M\left(ddHCl\right)}=\dfrac{0,3}{0,05}=6M\)
\(n_{H_2}=\dfrac{V_{H_2}}{22,4}=\dfrac{3,36}{22,4}=0,15mol\)
a. PTHH: Fe + H2SO4 \(\rightarrow\) FeSO4 + H2
TL: 1 1 1 1
mol: 0,15 \(\leftarrow\) 0,15 \(\leftarrow\) 0,15 \(\leftarrow\) 0,15
\(b.m_{Fe}=n.M=0,15.56=8,4g\)
Đổi 150ml = 0,15 l
\(c.C_{MddH_2SO_4}=\dfrac{n}{V}=\dfrac{0,15}{0,15}=1M\)
\(n_{H_2}=\dfrac{3,36}{22,4}=0,15\left(mol\right)\)
PTHH: \(Fe+2HCl\rightarrow FeCl_2+H_2\uparrow\)
\(n_{Fe}=n_{H_2}=0,15\left(mol\right)\)
\(m_{Fe}=0,15.56=8,4\left(g\right)\)
\(n_{HCl}=2n_{H_2}=0,3\left(mol\right)\)
\(50ml=0,05l\)
\(C_{M_{ddHCl}}=\dfrac{0,3}{0,05}=6\left(M\right)\)
Câu 6:
\(a,n_{CaCO_3}=x(mol);n_{MgCO_3}=y(mol)\\ \Rightarrow 100x+84y=3,84(1)\\ CaCO_3+2HCl\to CaCl_2+H_2O+CO_2\uparrow\\ MgCO_3+2HCl\to MgCl_2+H_2O+CO_2\uparrow\\ \Rightarrow x+y=0,03(2)\\ (1)(2)\Rightarrow \begin{cases} x=0,0825(mol)\\ y=-0,525(mol) \end{cases}\)
Đề sai, bn xem lại đề
Câu 7:
\(n_{H_2}=\dfrac{3,36}{22,4}=0,15(mol)\\ a,Fe+2HCl\to FeCl_2+H_2\\ \Rightarrow n_{Fe}=0,15(mol);n_{HCl}=0,3(mol)\\ b,m_{Fe}=0,15.56=8,4(g)\\ c,C_{M_{HCl}}=\dfrac{0,3}{0,05}=6M\)