Hãy nhập câu hỏi của bạn vào đây, nếu là tài khoản VIP, bạn sẽ được ưu tiên trả lời.
\(a.Zn+2HCl\rightarrow ZnCl_2+H_2\\ b.m_{ZnCl_2}=13,6\left(g\right)\)
Hiện tượng : kẽm bị tan dần , có khí không màu thoát ra .
Zn + 2HCl ---> ZnCl2 + H2
0,1 0,2 0,1 0,1
nZn = 6,5 / 65 = 0,1 ( mol )
V H2 = \(\dfrac{n.R.t}{p}=\dfrac{0,1.0,082.\left(273+25\right)}{1}=2,4436\left(l\right)\)
H2 + CuO ---> Cu + H2O
0,1 0,1
=> mCu = 0,1 . 64 = 6,4 (g)
a) Zn + 2HCl --> ZnCl2 + H2
b) \(n_{Zn}=\dfrac{13}{65}=0,2\left(mol\right)\)
PTHH: Zn + 2HCl --> ZnCl2 + H2
_____0,2->0,4------->0,2---->0,2
=> mHCl = 0,4.36,5 = 14,6 (g)
c) mZnCl2 = 0,2.136 = 27,2 (g)
d) VH2 = 0,2.24,79 = 4,958(l)
\(n_{Zn}=\dfrac{6,5}{65}=0,1\left(mol\right);n_{HCl}=\dfrac{365.10\%}{36,5}=1\left(mol\right)\\PTHH:Zn+2HCl\rightarrow ZnCl_2+H_2\\ Vì:\dfrac{1}{2}>\dfrac{0,1}{1}\Rightarrow HCldư\\ n_{ZnCl_2}=n_{Zn}=0,1\left(mol\right)\Rightarrow m_{ZnCl_2}=136.0,1=13,6\left(g\right)\)
a, \(Zn+2HCl\rightarrow ZnCl_2+H_2\)
b, \(n_{Zn}=\dfrac{39}{65}=0,6\left(mol\right)\)
Theo PT: \(n_{HCl}=2n_{Zn}=1,2\left(mol\right)\Rightarrow m_{HCl}=1,2.36,5=43,8\left(g\right)\)
c, \(n_{H_2}=n_{Zn}=0,6\left(mol\right)\Rightarrow V_{H_2}=0,6.24,79=14,874\left(l\right)\)
d, - Quỳ tím hóa đỏ do HCl dư.
a, \(Fe_3O_4+4H_2\underrightarrow{t^o}3Fe+4H_2O\)
b, \(n_{Fe}=\dfrac{11,2}{56}=0,2\left(mol\right)\)
Theo PT: \(n_{Fe_3O_4}=\dfrac{1}{3}n_{Fe}=\dfrac{1}{15}\left(mol\right)\Rightarrow m_{Fe_3O_4}=\dfrac{1}{15}.232=\dfrac{232}{15}\left(g\right)\)
c, \(n_{H_2}=\dfrac{4}{3}n_{Fe}=\dfrac{4}{15}\left(mol\right)\Rightarrow V_{H_2}=\dfrac{4}{15}.22,4=\dfrac{448}{75}\left(l\right)\)
d, \(Zn+2HCl\rightarrow ZnCl_2+H_2\)
\(n_{Zn}=n_{H_2}=\dfrac{4}{15}\left(mol\right)\Rightarrow m_{Zn}=\dfrac{4}{15}.65=\dfrac{52}{3}\left(g\right)\)
\(n_{HCl}=2n_{H_2}=\dfrac{8}{15}\left(mol\right)\Rightarrow m_{HCl}=\dfrac{8}{15}.36,5=\dfrac{292}{15}\left(g\right)\)
a ) \(n_{Fe_2O_4}=\frac{23,2}{232}=0,1\) mol
\(Fe_3O_4+4H_2\underrightarrow{t^0}3Fe+4H_2O\)
0,1 -> 0,4 -> 0,3
\(\Rightarrow n_{H_2}=4n_{Fe_3O_4}=0,4\) mol \(\Rightarrow V_{H_2}=0,4.22,4=8,96\) lít
b ) \(n_{Fe}=3n_{Fe_3O_4}=0,3\) mol \(\Rightarrow m_{Fe}=56.0,3=16,8\) gam.
\(n_{Zn}=\dfrac{3,25}{65}=0,05mol\)
\(Zn+2HCl\rightarrow ZnCl_2+H_2\)
0,05 0,1 0,05 ( mol )
\(V_{H_2}=0,05.22,4=1,12l\)
\(m_{HCl}=0,1.36,5=3,65g\)
\(Fe_3O_4+4H_2\rightarrow\left(t^o\right)3Fe+4H_2O\)
0,05 0,0375 ( mol )
\(m_{Fe}=0,0375.56=2,1g\)