Hãy nhập câu hỏi của bạn vào đây, nếu là tài khoản VIP, bạn sẽ được ưu tiên trả lời.
\(n_{Fe}=\dfrac{2.8}{56}=0.05\left(mol\right)\)
\(Fe+2HCl\rightarrow FeCl_2+H_2\)
\(0.05................................0.05\)
\(V_{H_2}=0.05\cdot22.4=1.12\left(l\right)\)
\(n_{CuO}=\dfrac{6}{80}=0.075\left(mol\right)\)
\(CuO+H_2\underrightarrow{^{^{t^0}}}Cu+H_2O\)
\(1............1\)
\(0.075......0.05\)
Chất khử : H2 . Chất OXH : CuO
\(LTL:\dfrac{0.075}{1}>\dfrac{0.05}{1}\Rightarrow CuOdư\)
\(m_{CuO\left(dư\right)}=\left(0.075-0.05\right)\cdot64=1.6\left(g\right)\)
Zn+2HCl->ZnCl2+H2
0,05--------------------0,05
CuO+H2-to>Cu+H2O
0,05----0,05
n Zn=\(\dfrac{3,25}{65}=0,05mol\)
=>n CuO=\(\dfrac{6}{80}=0,075mol\)
=>CuO dư
=>m Cu=0,05.64=3,2g
=>m CuO dư=0,025.80=2g
\(a,PTHH:\\ Zn+2HCl\rightarrow ZnCl_2+H_2\uparrow\left(1\right)\\ CuO+H_2\underrightarrow{t^o}Cu+H_2O\left(2\right)\\ b,n_{Zn}=\dfrac{3,25}{65}=0,05\left(mol\right)\\ Theo.pt\left(1\right):n_{H_2}=n_{Zn}=0,05\left(mol\right)\\ n_{CuO}=\dfrac{6}{80}=0,075\left(mol\right)\\ LTL.pt\left(2\right):0,075>0,05\Rightarrow CuO,dư\\ Theo.pt\left(2\right):n_{Cu}=n_{CuO\left(pư\right)}=n_{H_2}=0,05\left(mol\right)\\ m_{Cu}=0,05.64=3,2\left(g\right)\\ c,m_{CuO\left(dư\right)}=\left(0,075-0,05\right).80=2\left(g\right)\)
nMg = 4.8/24 = 0.2 (mol)
Mg + 2HCl => MgCl2 + H2
0.2.................................0.2
CuO + H2 -to-> Cu + H2O
...........0.2..........0.2
mCu = 0.2*64 = 12.8 (g)
a) PTHH: Mg + 2HCl -> MgCl2 + H2
0,2____________0,4___0,2___0,2(mol)
CuO + H2 -to-> Cu + H2O
0,2___0,2____0,2(mol)
b) =>mCu=0,2.64=12,8(g)
a)
$Fe + 2HCl \to FeCl_2 + H_2$
b)
Theo PTHH :
$n_{H_2} = n_{Fe} = \dfrac{5,6}{56} = 0,1(mol)$
$V_{H_2} = 0,1.22,4 = 2,24(lít)$
c)
$n_{CuO} = \dfrac{8}{80} = 0,1(mol)$
$CuO + H_2 \xrightarrow{t^o} Cu + H_2O$
Ta thấy : $\dfrac{n_{CuO}}{1} = \dfrac{n_{H_2}}{1}$ nên CuO phản ứng hết
$n_{Cu} = n_{H_2} = 0,1(mol)$
$m_{Cu} = 0,1.64 = 6,4(gam)$
\(n_{Zn}=\dfrac{m}{M}=\dfrac{3,25}{65}=0,05\left(mol\right)\)
\(PTHH:Zn+2HCl\rightarrow ZnCl_2+H_2\)
1 2 1 1
0,05 0,1 0,05 0,05
a) \(V_{H_2}=n.24,79=0,05.24,79=1,2395\left(l\right)\)
\(m_{ZnCl_2}=n.M=0,05.\left(65+35,5.2\right)=6,8\left(g\right)\)
b) \(PTHH:CuO+H_2\underrightarrow{t^o}Cu+H_2O\)
Ta cos tỉ lệ: \(\dfrac{0,1}{1}>\dfrac{0,05}{1}\Rightarrow\) CuO dư.
Theo ptr, ta có: \(n_{Cu}=n_{H_2}=0,05mol\\ \Rightarrow m_{Cu}=n.M=0,05.64=3,2\left(g\right).\)
a, PT: \(Zn+2HCl\rightarrow ZnCl_2+H_2\)
Ta có: \(n_{Zn}=\dfrac{3,25}{65}=0,05\left(mol\right)\)
THeo PT: \(n_{ZnCl_2}=n_{H_2}=n_{Zn}=0,05\left(mol\right)\)
\(\Rightarrow V_{H_2}=0,05.24,79=1,2395\left(l\right)\)
\(m_{ZnCl_2}=0,05.136=6,8\left(g\right)\)
b, Ta có: \(n_{CuO}=\dfrac{8}{80}=0,1\left(mol\right)\)
PT: \(CuO+H_2\underrightarrow{t^o}Cu+H_2O\)
Xét tỉ lệ: \(\dfrac{0,1}{1}>\dfrac{0,05}{1}\), ta được CuO dư.
Theo PT: \(n_{Cu}=n_{H_2}=0,05\left(mol\right)\Rightarrow m_{Cu}=0,05.64=3,2\left(g\right)\)
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, \(n_{CuO}=\dfrac{12}{80}=0,15\left(mol\right)\)
PT: \(CuO+H_2\underrightarrow{t^o}Cu+H_2O\)
Xét tỉ lệ: \(\dfrac{0,15}{1}>\dfrac{0,1}{1}\), ta được CuO dư.
Theo PT: \(n_{Cu}=n_{H_2}=0,1\left(mol\right)\Rightarrow m_{Cu}=0,1.64=6,4\left(g\right)\)
a) nAl=0,2(mol)
PTHH: 2 Al + 6 HCl -> 2 AlCl3 + 3 H2
H2 + CuO -to-> Cu + H2O
nAlCl3= nAl= 0,2(mol)
=> mAlCl3= 133,5. 0,2= 26,7(g)
b) nCu= nH2= 3/2 . 0,2=0,3(mol)
=> mCu= 0,3.64=19,2(g)
(Qua phản ứng nghe kì á, chắc tạo thành chứ ha)
<3
Theo gt ta có: $n_{Zn}=0,1(mol);n_{CuO}=0,25(mol)$
a, $Zn+2HCl\rightarrow ZnCl_2+H_2$
$CuO+H_2\rightarrow Cu+H_2O$
b, Ta có: $n_{ZnCl_2}=0,1(mol)\Rightarrow m_{ZnCl_2}=13,6(g)$
b, Ta có: $n_{H_2}=0,1(mol)$
Sau phản ứng chất còn dư là CuO dư 0,15 mol
$\Rightarrow m_{CuO/du}=12(g)$
a)
$Zn + 2HCl \to ZnCl_2 + H_2$
$CuO + H_2 \xrightarrow{t^o} Cu + H_2O$
b)
n ZnCl2 = n Zn = 6,5/65 = 0,1(mol)
=> m ZnCl2 = 0,2.136 = 13,6(gam)
c) n H2 = n Zn = 0,1 mol
CuO + H2 --to--> Cu + H2O
n CuO = 20/80 = 0,25 > n H2 = 0,1 nên CuO dư
n CuO pư = n H2 = 0,1 mol
=> m CuO dư = 20 - 0,1.80 = 12(gam)
a) CuO + H2 \(\underrightarrow{t^o}\) Cu + H2O (1)
b) nCuO = 16 : 80 = 0,2(mol)
Theo PT(1) => nCu = nCuO = 0,2(mol)
=> mCu = 0,2 . 64 =12,8(g)
c)2 Cu + O2 \(\rightarrow\) 2CuO (2)
Vì VO2 = 1/5 . Vkk => VO2 = 1/5 . 112 =22,4(l)
=> nO2 = 22,4 : 22,4 = 1(mol)
Lập tỉ lệ :
\(\dfrac{n_{Cu\left(ĐB\right)}}{n_{Cu\left(PT\right)}}=\dfrac{0,2}{2}=0,1\) < \(\dfrac{n_{O2\left(ĐB\right)}}{n_{O2\left(PT\right)}}=\dfrac{1}{1}=1\)
=> Sau pứ Cu hết , O2 dư
Theo PT (2)=> nCuO(lý thuyết) = nCu = 0,2(mol)
=> mCuO(lý thuyết) = 0,2 . 80 =16(g)
mà hao hụt 10%
=> mCuO(thu được) = 16 - 10%.16 =14,4(g)