Hãy nhập câu hỏi của bạn vào đây, nếu là tài khoản VIP, bạn sẽ được ưu tiên trả lời.
\(1,\\ Mg+2HCl\rightarrow MgCl_2+H_2\\ 2,\\ n_{HCl}=\dfrac{18,25}{36,5}=0,5\left(mol\right)\Rightarrow n_{Mg}=n_{MgCl_2}=n_{H_2}=\dfrac{0,5}{2}=0,25\left(mol\right)\\ V_{H_2\left(đktc\right)}=0,25.22,4=5,6\left(l\right)\\ 3,\\ m_{MgCl_2}=95.0,25=23,75\left(g\right)\\ 4,\\ H_2+CuO\rightarrow\left(t^o\right)Cu+H_2O\\ n_{Cu}=n_{H_2}=0,25\left(g\right)\\ m_{Cu}=0,25.64=16\left(g\right)\)
1. \(Mg+2HCl\rightarrow MgCl_2+H_2\)
2. \(n_{HCl}=\dfrac{m_{HCl}}{M_{HCl}}=\dfrac{18,25}{36,5}\approx0,5\left(mol\right)\)
Theo PTHH: \(n_{H_2}=\dfrac{1}{2}n_{HCl}\)
\(\Rightarrow n_{H_2}=\dfrac{1}{2}.0,5=0,25\left(mol\right)\)
\(\Rightarrow V_{H_2}=n_{H_2}.22,4=0,25.22,4=5,6\left(l\right)\)
3. Theo PTHH: \(n_{MgCl_2}=\dfrac{1}{2}n_{HCl}\)
\(\Rightarrow n_{MgCl_2}=0,25\left(mol\right)\)
\(m_{MgCl_2}=n_{MgCl_2}.M_{MgCl_2}=0,25.95=23,75\left(g\right)\)
4. \(H_2+CuO\rightarrow Cu+H_2O\)
Theo PTHH: \(n_{Cu}=n_{H_2}=0,25\left(mol\right)\)
\(\Rightarrow m_{Cu}=n_{Cu}.M_{Cu}=0,25.64=16\left(g\right)\)
a, PTHH:
H2 + ZnO → Zn + H2O
nZnO = 8,1 / 81 = 0,1 ( mol)
Thep PTHH nH2 = nZnO = 0,1( mol)
nzn = nZnO = 0,1 (mol)
VH2 = 0,1 x 22,4 = 2,24 (l)
b, mZn = 0,1 x 65 = 6,5 (g)
c, Zn + 2HCl → ZnCl2 + H2
mHCl = 200 x 7,3 % = 14,6 ( g)
nHCl = 14,6 / 36,5 = 0,4 ( mol)
Theo PTHH nH2 = 1/2nHCl= 0,4 /2 = 0,2( mol)
VH2 = 0,2 x 22,4 = 4,48( l)
d, y H2 + FexOy → x Fe + yH2O
Theo câu a nH2 = 0,1 ( mol)
Theo PTHH nFexOy= 1/ynH2 = 0,1 /y ( mol)
mFexOy = 0,1/y( 56x + 16y)= 3,24 (g)
đoạn này bạn tự tính nhé!
a.b.
\(n_{Fe}=\dfrac{2,8}{56}=0,05mol\)
\(Fe+2HCl\rightarrow FeCl_2+H_2\)
0,05 0,1 0,05 ( mol )
\(V_{H_2}=0,05.22,4=1,12l\)
\(m_{HCl}=0,1.36,5=3,65g\)
c.
\(CuO+H_2\rightarrow\left(t^o\right)Cu+H_2O\)
0,05 0,05 ( mol )
\(m_{Cu}=0,05.64=3,2g\)
\(n_{Zn}=\dfrac{13}{65}=0,2(mol)\\ a,PTHH:Zn+2HCl\to ZnCl_2+H_2\\ b,n_{HCl}=2n_{Zn}=0,4(mol)\\ \Rightarrow m_{HCl}=0,4.36,5=14,6(g)\\ c,n_{H_2}=n_{Zn}=0,2(mol)\\ \Rightarrow V_{H_2}=0,2.22,4=4,48(l)\)
b) mHCl = 14,6 (g)
V H2 = 4,48 (l)
Giải thích các bước:
a) PTHH: Zn + 2HCl → ZnCl2 + H2↑
b) nZn = 13 : 65 = 0,2 mol
Theo PTHH: nHCl = 2.nZn = 0,4 mol
mHCl = 0,4 . 36,5 = 14,6(g)
c) nH2 = nZn = 0,2 mol
VH2 = 0,2 . 22,4 = 4,48 (l)
a) \(PTHH:Mg+2HCl\rightarrow MgCl_2+H_2\)
b) \(n_{Mg}=\dfrac{4,8}{24}=0,2mol\)
\(n_{HCl}=2.n_{Mg}=0,2.2=0,4mol\)
\(\Rightarrow m_{HCl}=n.M=0,4.36,5=14,6g\)
c) \(n_{H_2}=n_{Mg}=0,2mol\)
Thể tích khí hidro sinh ra (ở đktc):
\(V_{H_2}=0,2.24,79=4,958l.\)
1, \(a,Zn+2HCl\rightarrow ZnCl_2+H_2\)
\(b,n_{Zn}=0,3\left(mol\right)\Rightarrow n_{ZnCl2}=n_{H2}=0,3\left(mol\right)\)
\(n_{HCl}=0,6\left(mol\right)\)
\(\Rightarrow V_{H2}=0,3.22,4=6,72\left(l\right)\)
\(c,m_{ZnCl2}=40,8\left(g\right)\)
2.\(a,Zn+2HCl\rightarrow ZnCl_2+H_2\)
\(b,n_{Zn}=0,05\left(mol\right)\)
\(\Rightarrow n_{H2}=n_{ZnCl2}=0,05\left(mol\right)\)
\(\Rightarrow V_{H2}=0,05.22,4=1,12\left(l\right)\)
\(m_{ZnCl2}=6,8\left(g\right)\)
\(c,n_{CuO}=0,1\left(mol\right)\)
\(CuO+H_2\underrightarrow{^{to}}Cu+H_2O\)
Dư CuO . Tạo 0,05 mol Cu
\(\Rightarrow m_{Cu}=3,2\left(g\right)\)
a) Phản ứng
CuO + H 2 → t o Cu + H 2 O (1)
(mol) 0,3 0,3 ← 0,3
b) Ta có: n Cu = 19,2/64 = 0,3 (mol)
Từ (1) → n Cu = 0,3 (mol) → m CuO = 0,3 x 80 = 24 (gam)
Và n H 2 = 0,3 (mol) → V H 2 =0,3 x 22,4 = 6,72 (lít)
\(n_{Mg}=\dfrac{3,6}{24}=0,15\left(mol\right)\)
\(PTHH:Mg+2HCl\rightarrow MgCl_2+H_2\)
\(\left(mol\right)\) \(0,15\) \(0,3\) \(0,15\) \(0,15\)
\(a.V_{H_2}=0,15.22,4=3,36\left(l\right)\\ b.m_{MgCl_2}=95.0,15=14,25\left(g\right)\\ c.\\ PTHH:CuO+H_2\underrightarrow{t^o}Cu+H_2O\)
\(\left(mol\right)\) \(0,15\) \(0,15\) \(0,15\)
\(m_{Cu}=0,15.64=9,6\left(g\right)\)
nHCl=18,25/36,5=0,5mol
pt : Mg + 2HCl ------> MgCl2 +H2
npứ: 0,25<-0,5---------->0,25----->0,25
VH2=0,25.22,4=5,6l
mMgCl2 = 0,25.95=23,25g
pt: H2 + CuO --to--> Cu + H2O
npứ;0,25-------------->0,25
mCu=0,25.64=16g
1) \(n_{HCl}=\dfrac{m}{M}=\dfrac{18,25}{36,5}=0,5\left(mol\right)\)
Mg + 2HCl → MgCl2+ H2
1mol 2mol 1mol 1mol
0,25mol 0,5mol 0,25mol 0,25mol
2) \(v_{H_2}=n.22,4=0,25.22,4=5,6\left(l\right)\)
3) \(m_{MgCl_2}=n.M=0,25.95=23,75\left(g\right)\)
4) PT2:
CuO + H2 \(\underrightarrow{t^o}\) Cu + H2O
1mol 1mol 1mol 1mol
0,25mol 0,25mol 0,25mol 0,25mol
mCu= n.M= 0,25.64=16(g)