Hãy nhập câu hỏi của bạn vào đây, nếu là tài khoản VIP, bạn sẽ được ưu tiên trả lời.
a) \(Zn+2HCl\rightarrow ZnCl_2+H_2\)
nZn = \(\dfrac{13}{65}=0,2mol\)
Theo pt: nH2 = nZn = 0,2 mol
=> VH2 = 0,2.22,4 = 4,48 lít
b) Theo pt: nZnCl2 = nZn = 0,2 mol
=> mZnCl2 = 0,2.136 = 27,2g
a) Zn + 2HCl →ZnCl2 + H2
b) nZn = 6,5/65 = 0,1 mol . Theo tỉ lệ pư => nH2 = nZn = nZnCl2 =0,1 mol <=> VH2(đktc) = 0,1.22,4 = 2,24 lít.
c) mZnCl2 = 0,1 . 136 = 13,6 gam
d) nHCl =2nZn = 0,2 mol => mHCl = 0,2.36,5= 7,3 gam
Cách 2: áp dụng định luật BTKL => mHCl = mZnCl2 + mH2 - mZn
<=> mHCl = 13,6 + 0,1.2 - 6,5 = 7,3 gam
a. \(n_{Zn}=\dfrac{6.5}{65}=0,1\left(mol\right)\)
PTHH : Zn + 2HCl -> ZnCl2 + H2
0,1 0,2 0,1
b. \(V_{H_2}=0,1.22,4=2,24\left(l\right)\)
c. \(m_{HCl}=0,2.36,5=7,3\left(g\right)\)
\(n_{Zn}=\dfrac{6,5}{65}=0,1mol\)
\(Zn+2HCl\rightarrow ZnCl_2+H_2\)
0,1 0,2 0,1
\(V_{H_2}=0,1\cdot22,4=2,24l\)
\(m_{HCl}=0,2\cdot36,5=7,3g\)
a.b.c.\(n_{Zn}=\dfrac{m}{M}=\dfrac{13}{65}=0,2mol\)
\(Zn+2HCl\rightarrow ZnCl_2+H_2\)
0,2 0,2 0,2 ( mol )
\(m_{ZnCl_2}=n.M=0,2.136=27,2g\)
\(V_{H_2}=n.22,4=0,2.22,4=4,48l\)
d.\(n_{CuO}=\dfrac{m}{M}=\dfrac{32}{80}=0,4mol\)
\(CuO+H_2\rightarrow\left(t^o\right)Cu+H_2O\)
0,4 > 0,2 ( mol )
0,2 0,2 0,2 ( mol )
\(m_{chất.rắn}=m_{CuO\left(dư\right)}+m_{Cu}=0,2.80+0,2.64=16+12,8=28,8g\)
\(\%m_{CuO}=\dfrac{16}{28,8}.100=55,55\%\)
\(\%m_{Cu}=100\%-55,55\%=44,45\%\)
Theo gt ta có: $n_{Zn}=0,1(mol)$
a, $Zn+2HCl\rightarrow ZnCl_2+H_2$
b, Ta có: $n_{H_2}=0,1(mol)\Rightarrow V_{H_2}=2.24(l)$
c, Ta có: $n_{HCl}=2.n_{Zn}=0,2(mol)\Rightarrow m_{HCl}=7,3(g)$
\(n_{Zn}=\dfrac{3,25}{65}=0,05mol\)
a)\(Zn+2HCl\rightarrow ZnCl_2+H_2\)
0,05 0,1 0,05 0,05
b)\(m_{ZnCl_2}=0,05\cdot136=6,8g\)
c)\(V_{H_2}=0,05\cdot22,4=1,12l\)
\(n_{Zn}=\dfrac{19,5}{65}=0,3\left(mol\right)\)
PTHH :
\(Zn+2HCl\rightarrow ZnCl_2+H_2\uparrow\)
0,3 0,6 0,3 0,3
\(a,V_{H_2}=n.22,4=0,3.22,4=6,72\left(l\right)\)
\(m_{ZnCl_2}=0,3.136=40,8\left(g\right)\)
\(b,V_{ddHCl}=\dfrac{n}{C_M}=\dfrac{0,6}{2}=0,3\left(l\right)\)
\(c,Fe_2O_3+3H_2\rightarrow2Fe+3H_2O\)
0,1 0,3
\(n_{Fe_2O_3}=\dfrac{16}{160}=0,1\left(mol\right)\)
Ta có :
\(\dfrac{0,1}{1}=\dfrac{0,3}{3}\)
nên không chất nào dư
\(n_{Zn}=\dfrac{6,5}{65}=0,1\left(mol\right)\\
pthh:Zn+2HCl\rightarrow ZnCl_2+H_2\)
0,1 0,2 0,1
\(V_{H_2}=0,1.22,4=2,24l\\
m_{HCl}=\left(0,2.36,5\right).10\%=0,73g\)
\(n_{Fe_2O_3}=\dfrac{16}{160}=0,1\left(mol\right)\\
pthh:Fe_2O_3+3H_2\underrightarrow{t^o}2Fe+3H_2O\\
LTL:\dfrac{0,1}{1}>\dfrac{0,1}{3}\)
=> Fe2O3 dư
\(n_{Fe}=\dfrac{2}{3}n_{H_2}=0,067\left(mol\right)\\
m_{Fe}=0,067.56=3,73g\)
a.b.\(n_{Zn}=\dfrac{6,5}{65}=0,1mol\)
\(Zn+2HCl\rightarrow ZnCl_2+H_2\)
0,1 0,2 0,1 ( mol )
\(V_{H_2}=0,1.22,4=2,24l\)
\(m_{ddHCl}=\dfrac{0,2.36,5}{10\%}=73g\)
c.\(n_{Fe_2O_3}=\dfrac{16}{160}=0,1mol\)
\(Fe_2O_3+3H_2\rightarrow\left(t^o\right)2Fe+3H_2O\)
0,1 > 0,1 ( mol )
0,1 1/15 ( mol )
\(m_{Fe}=\dfrac{1}{15}.56=3,73g\)
\(n_{Zn}=\dfrac{16.25}{65}=0.25\left(mol\right)\)
\(Zn+2HCl\rightarrow ZnCl_2+H_2\)
\(0.25...................0.25.....0.25\)
\(V_{H_2}=0.25\cdot22.4=5.6\left(l\right)\)
\(m_{ZnCl_2}=0.25\cdot136=34\left(g\right)\)