Hãy nhập câu hỏi của bạn vào đây, nếu là tài khoản VIP, bạn sẽ được ưu tiên trả lời.
\(m_{Zn}=60,5-28=32,5g\\
n_{Fe}=\dfrac{28}{56}=0,5\left(mol\right)\\
n_{Zn}=\dfrac{32,5}{65}=0,5\left(mol\right)\\
pthh:Zn+2HCl\rightarrow ZnCl_2+H_2\)
0,5 0,5 0,5
\(Fe+2HCl\rightarrow FeCl_2+H_2\)
0,5 0,5 0,5
\(V_{H_2}=\left(0,5+0,5\right).22,4=22,4\left(L\right)\\
m_{Mu\text{ối}}=\left(0,5.136\right)+\left(0,5.127\right)=131,5g\)
Zn +2 HCl----> ZnCl2 +H2(1)
Fe +2HCl----> FeCl2 +H2(2)
a) m\(_{Fe}=\)\(\frac{60,5.46,289}{100}=28\left(g\right)\)
m\(_{Zn}=60,5-28=32,5\left(g\right)\)
b) Ta có
n\(_{Fe}=\frac{28}{56}=0,5\left(mol\right)\)
Theo pthh2
n\(_{H2}=n_{Fe}=0,5\left(mol\right)\)
n\(_{Zn}=\frac{32,5}{65}=0,5\left(mol\right)\)
Theo pthh1
n\(_{H2}=n_{Zn}=0,5\left(mol\right)\)
ϵ n\(_{H2}=0,5+0,5=1\left(mol\right)\)
V\(_{H2}=1.22,4-22,4\left(l\right)\)
c) Theo pthh1
n\(_{ZnCl2}=n_{Zn}=0,5\left(mol\right)\)
m\(_{ZnCl2}=0,5.136=68\left(g\right)\)
Theo pthh2
n\(_{FeCl2}=n_{Fe}=0,5\left(mol\right)\)
m\(_{FeCl2}=0,5.127=63,5\left(g\right)\)
Chúc bạn học tốt
PTHH:Zn+HCl\(\underrightarrow{ }\)ZnCl2+H2(1)
Fe+HCl\(\underrightarrow{ }\)FeCl2+H2(2)
a)mFe=\(46,289\%.60,5=28\left(gam\right)\)
\(\Rightarrow m_{Zn}=60,5-28=32,5\left(gam\right)\)
b)Theo PTHH(1):65 gam Zn tạo ra 136 gam
Vậy:32,5 gam Zn tạo ra 11,2 lít H2
Theo PTHH(2):56 gam Fe tạo ra 22,4 lít H2
Vậy:28 gam Fe tạo ra 11,2 lít H2
Do đó:\(V_{H_2}=11,2+11,2=22,4\left(lít\right)\)
c)
Theo PTHH(1):65 gam Zn tạo ra 136 gam ZnCl2
Vậy:32,5 gam Zn tạo ra 68 gam ZnCl2
Theo PTHH(2):56 gam Fe tạo ra 127 gam FeCl2
Vậy:28 gam Fe tạo ra 63,5 gam FeCl2
Do đó khối lượng mỗi muối tao thành:68+63,5=131,5(gam)
Bạn thử dùng app giải bài hóa này chưa ?
https://play.google.com/store/apps/details?id=com.gthh.giaitoanhoahoc
\(Zn+2HCl--->ZnCl_2+H_2\) \((1)\)
\(Fe+2HCl---> FeCl_2+H_2\) \((2)\)
\(a)\)
\(mFe=\dfrac{60,5.46,289}{100}=28(g)\)
\(=> nFe=\dfrac{28}{56}=0,5(mol)\)
\(=> mZn=60,5-28=32,5(g)\)
\(=> nZn=\dfrac{32,5}{65}=0,5(mol)\)
\(b)\)
Theo PTHH (1) và (2) \(nH_2=0,5+0,5=1(mol)\)
\(=> VH_2(đktc)=1.22,4=22,4(l)\)
\(c)\)
Theo (1) \(nZnCl_2=nZn=0,5(mol)\)
\(=> mZnCl_2=0,5.136=68(g)\)
Theo (2) \(nFeCl_2=nFe=0,5(mol)\)
\(=> mFeCl_2=0,5.127=63,5(g)\)
Zn+2HCl−−−>ZnCl2+H2 (1)
Fe+2HCl−−−>FeCl2+H2(2)
a)
mFe=60,5.46,289/100=28(g)
=>nFe=28/56=0,5(mol)
=>mZn=60,5−28=32,5(g)
=>nZn=32,5/65=0,5(mol)
b)
Theo PTHH (1) và (2) nH2=0,5+0,5=1(mol)
=>VH2(đktc)=1.22,4=22,4(l)
c)
Theo (1) nZnCl2=nZn=0,5(mol)
=>mZnCl2=0,5.136=68(g)
Theo (2) nFeCl2=nFe=0,5(mol)
=>mFeCl2=0,5.127=63,5(g)
a) Ta có: mFe = \(\dfrac{60,5.49,289}{100}\approx28\left(g\right)\)
⇒
mZn = 60,5 - 28 = 32,5g
b) PTPỨ: Zn + 2HCl →→ ZnCl2 + H2 (1)
Fe + 2HCl →→ FeCl2 + H2 (2)
Theo ptr (1): nH2 (1) = nZn = \(\dfrac{32,5}{65}=0,5\left(mol\right)\)
Theo ptr (2) : n H2 (2) = nFe = \(\dfrac{28}{56}=0,5\left(mol\right)\)
⇒VH2 = (nH2 (1) + nH2 (2) ) . 22,4 = (0,5 + 0,5).22,4=22,4 lít
c) Theo (1): nZnCl2 = nZn = 0,5 mol
⇒⇒ mZnCl2 = 0,5.136 = 68(g)
Theo (2): nFeCl2 = nFe = 0,5 mol
⇒
mFeCl2 = 0,5 . 127 = 63,5 g
- pt: Zn + 2HCl -> ZnCl2 +H2
- nHCl = ( 3,25 : 65 ) x 2 = 0,1 (mol)
V = 0,1 : 0,5 = 0,2 (l)
- gọi a là số mol cần tìm
- pt: 2Al + 3H2SO4 -> Al2(SO4)3 + 3H2
a -> 3/2a
Fe + H2SO4 -> FeSO4 + H2
a -> a
- ta có : a + 3/2a = 0,05 => a = 0,02 (mol)
- C%Fe = ( 0,02 x 56)x100 / (0,02x56 + 0,02x 27) = 67,47%
- C% Al = 100 -67,47= 32,53%
\(n_{H_2}=\dfrac{3,36}{22,4}=0,15mol\)
\(\left\{{}\begin{matrix}n_{Al}=x\left(mol\right)\\n_{Ag}=y\left(mol\right)\end{matrix}\right.\Rightarrow27x+108y=4,2\left(1\right)\)
\(2Al+3H_2SO_4\rightarrow Al_2\left(SO_4\right)_3+3H_2\)
0,1 0,05 0,15
\(\Rightarrow m_{Al}=0,1\cdot27=2,7g\)
\(\Rightarrow m_{Ag}=4,2-2,7=1,5g\)
a)\(\%m_{Al}=\dfrac{2,7}{4,2}\cdot100\%=64,28\%\)
\(\%m_{Ag}=100\%-64,28\%=35,72\%\)
b)\(m_{muối}=0,05\cdot342=17,1g\)
Gọi \(\left\{{}\begin{matrix}n_{Zn}=a\left(mol\right)\\n_{Fe}=b\left(mol\right)\end{matrix}\right.\)
\(n_{H_2}=\dfrac{15,68}{22,4}=0,7\left(mol\right)\\ m_{HCl}=200.27,375\%=54,75\left(g\right)\\ n_{HCl}=\dfrac{54,75}{36,5}=1,5\left(mol\right)\)
PTHH:
Zn + 2HCl ---> ZnCl2 + H2
a ----> 2a --------> a -----> a
Fe + 2HCl ---> FeCl2 + H2
b ---> 2b -------> b ------> b
Hệ pt \(\left\{{}\begin{matrix}65a+56b=43,7\\a+b=0,7\end{matrix}\right.\Leftrightarrow\left\{{}\begin{matrix}a=0,5\left(mol\right)\\b=0,2\left(mol\right)\end{matrix}\right.\)
\(\rightarrow\left\{{}\begin{matrix}m_{Zn}=0,5.65=32,5\left(g\right)\\m_{Fe}=0,2.56=11,2\left(g\right)\end{matrix}\right.\)
\(m_{dd}=43,7+200-0,7.2=242,3\left(g\right)\\ \rightarrow\left\{{}\begin{matrix}C\%_{ZnCl_2}=\dfrac{0,5.136}{242,3}=28,06\%\\C\%_{FeCl_2}=\dfrac{0,2.127}{242,3}=10,48\%\\C\%_{HCl\left(dư\right)}=\dfrac{\left(1,5-0,5.2-0,2.2\right).36,5}{242,3}=1,51\%\end{matrix}\right.\)
\(n_{H_2}=\dfrac{15,68}{22,4}=0,7\left(mol\right)\\
pthh:\left\{{}\begin{matrix}Zn+H_2SO_4->ZnSO_4+H_2\\Fe+H_2SO_4->FeSO_{\text{ 4 }}+H_2\end{matrix}\right.\)
gọi số mol Zn là x , số mol Fe là y
=> 65x+56y=43,7
=> a+b=0,7
=>a=0,5 , b =0,2
=> \(m_{Zn}=0,5.65=32,5\\ m_{Fe}=43,7-32,5=11,2\left(G\right)\)
a) Ta có: mFe = \(\frac{60,5.46,289}{100}\) \(\approx\) 28g
\(\Rightarrow\) mZn = 60,5 - 28 = 32,5g
b) PTPỨ: Zn + 2HCl \(\rightarrow\) ZnCl2 + H2 (1)
Fe + 2HCl \(\rightarrow\) FeCl2 + H2 (2)
Theo ptr (1): nH2 (1) = nZn = \(\frac{32,5}{65}\)= 0,5 mol
Theo ptr (2) : n H2 (2) = nFe = \(\frac{28}{56}\) = 0,5 mol
\(\Rightarrow\) VH2 = (nH2 (1) + nH2 (2) ) . 22,4 = (0,5 + 0,5).22,4=22,4 lít
c) Theo (1): nZnCl2 = nZn = 0,5 mol
\(\Rightarrow\) mZnCl2 = 0,5.136 = 68(g)
Theo (2): nFeCl2 = nFe = 0,5 mol
\(\Rightarrow\) mFeCl2 = 0,5 . 127 = 63,5 g