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\(n_{HCl}=0,1mol\)
\(Fe+2HCl\rightarrow FeCl_2+H_2\)
0,1 0,2 0,1 0,1
\(m_{FeCl_2}=0,1\cdot127=12,7g\)
\(V_{H_2}=0,1\cdot22,4=2,24l\)
a) $Zn + 2HCl \to ZnCl_2 + H_2$
b) Theo PTHH :
$n_{ZnCl_2} = n_{Zn} = \dfrac{6,5}{65} = 0,1(mol)$
$m_{ZnCl_2} = 0,1.136 = 13,6(gam)$
c)
$n_{H_2} = n_{Zn} = 0,1(mol) \Rightarrow V_{H_2} = 0,1.22,4 = 2,24(lít)$
d)
$n_{HCl} = 2n_{Zn} = 0,2(mol) \Rightarrow C_{M_{HCl}} = \dfrac{0,2}{0,5} = 0,4M$
a, \(Zn+2HCl\rightarrow ZnCl_2+H_2\)
b, \(n_{Zn}=\dfrac{6,5}{65}=0,1\left(mol\right)\)
Theo PT: \(n_{H_2}=n_{Zn}=0,1\left(mol\right)\Rightarrow V_{H_2}=0,1.22,4=2,24\left(l\right)\)
c, \(n_{HCl}=2n_{Zn}=0,2\left(mol\right)\Rightarrow m_{HCl}=0,2.36,5=7,3\left(g\right)\)
\(Zn+2HCl\rightarrow ZnCl_2+H_2\)
\(1mol\) \(2mol\) \(1mol\)
\(0,1mol\) \(0,2mol\) \(0,1mol\)
\(n_{Zn}=\dfrac{m}{M}=\dfrac{6,5}{65}=0,1\left(mol\right)\)
\(m_{HCl}=n.M=0,2.36,5=7,3\left(g\right)\)
\(V_{H_2}=n.22,4=0,1.22,4=2,24\left(l\right)\)
a) Fe + 2HCl --> FeCl2 + H2
b) nHCl = 0,2.1 = 0,2 (mol)
PTHH: Fe + 2HCl --> FeCl2 + H2
0,2---->0,1--->0,1
=> mFeCl2 = 0,1.127 = 12,7 (g)
c) VH2 = 0,1.22,4 = 2,24 (l)
a) Zn + 2HCl --> ZnCl2 + H2
b) nHCl = 0,2.1 = 0,2 (mol)
PTHH: Zn + 2HCl --> ZnCl2 + H2
0,2----->0,1---->0,1
=> mZnCl2 = 0,1.136 = 13,6 (g)
c) VH2 = 0,1.22,4 = 2,24 (l)
a, PT: \(Fe+2HCl\rightarrow FeCl_2+H_2\)
b, Ta có: \(n_{Fe}=\dfrac{14}{56}=0,25\left(mol\right)\)
Theo PT: \(n_{HCl}=2n_{Fe}=0,5\left(mol\right)\)
\(\Rightarrow m_{HCl}=0,25.36,5=18,25\left(g\right)\)
c, Theo PT: \(n_{H_2}=n_{Fe}=0,25\left(mol\right)\)
\(\Rightarrow V_{H_2}=0,25.22,4=5,6\left(l\right)\)
nFe = 7,2 : 56 = 9/70 (mol )
pthh : Fe + 2HCl ---> FeCl2 + H2
9/70-->9/35-------------->9/70 (mol)
=> VH2 = 9/70. 22,4 =2,88(l)
=> mHCl = 9/35 . 36,5 = 9,38 (g)
Số mol của sắt là 7,2/56=9/70 (mol).
a/ PTHH: Fe (9/70 mol) + 2HCl (9/35 mol) \(\rightarrow\) FeCl2 + H2\(\uparrow\) (9/70 mol).
b/ Thể tích khí hiđro sinh ra:
V=9/70.22,4=2,88 (lít).
c/ Khối lượng của axit HCl đã dùng:
m=9/35.36,5=657/70 (g)\(\approx\)9,386 (g).
a. \(PTHH:Mg+2HCl\rightarrow MgCl_2+H_2\uparrow\)
\(n_{Mg}=\dfrac{m_{Mg}}{M_{Mg}}=\dfrac{12}{24}=0,5\left(mol\right)\)
- Mol theo PTHH : \(1:2:1:1\)
- Mol theo phản ứng : \(0,5\rightarrow1\rightarrow0,5\rightarrow0,5\)
\(\Rightarrow n_{H_2}=0,5\left(mol\right)\)
\(\Rightarrow V_{H_2}=n_{H_2}.22,4=0,5.22,4=11,2\left(l\right)\)
b. Từ a. \(\Rightarrow n_{HCl}=1\left(mol\right)\)
\(\Rightarrow m_{HCl}=n_{HCl}.M_{HCl}=1.\left(1+35,5\right)=36,5\left(g\right)\)
c. \(n_{O_2}=\dfrac{V_{O_2}}{22,4}=\dfrac{6,72}{22,4}=0,3\left(mol\right)\)
\(PTHH:2H_2+O_2\underrightarrow{t^o}2H_2O\)
- Mol theo PTHH : \(2:1:2\)
- Mol theo phản ứng : \(0,6\leftarrow0,3\rightarrow0,6\)
\(\Rightarrow n_{H_2O}=0,6\left(mol\right)\)
\(\Rightarrow m_{H_2O}=n_{H_2O}.M_{H_2O}=0,6.\left(2+16\right)=10,8\left(g\right)\)
a) \(Fe+2HCl\text{→}FeCl_2+H_2\)
n Fe = 2,8:56=0,05 mol = n H2
V H2 = 0,05.22,4=1,12 lít
n HCl = n Fe .2 =0,1 mol
m HCl = 0,1.(1+35,5)=3,65 g
a) PTHH: \(Fe+2HCl\rightarrow FeCl_2+H_2\uparrow\)
b) \(n_{H_2}=n_{Fe}=\dfrac{2,8}{56}=0,05\left(mol\right)\)
\(\Rightarrow V_{H_2}=n.22,4=0,05.22,4=1,12\left(l\right)\)
c) \(n_{HCl}=2n_{Fe}=0,1\left(mol\right)\)
\(m_{HCl}=n.M=0,1.36,5=3,65\left(g\right)\)