hòa tan m(g) CuO vào 200ml dung dịch HCL 2m
a) viết phương trình hóa học
b)tính m
c)tính CM dung dịch sau phản ứng
Hãy nhập câu hỏi của bạn vào đây, nếu là tài khoản VIP, bạn sẽ được ưu tiên trả lời.
PTHH: \(Fe+2HCl\rightarrow FeCl_2+H_2\uparrow\)
\(FeCl_2+2NaOH\rightarrow Fe\left(OH\right)_2\downarrow+2NaCl\)
Ta có: \(n_{Fe\left(OH\right)_2}=\dfrac{18}{90}=0,2\left(mol\right)\)
\(\Rightarrow\left\{{}\begin{matrix}n_{NaOH}=0,4\left(mol\right)\\n_{H_2}=0,2\left(mol\right)\end{matrix}\right.\) \(\Rightarrow\left\{{}\begin{matrix}V_{H_2}=0,2\cdot22,4=4,48\left(l\right)\\C\%_{NaOH}=\dfrac{0,4\cdot40}{160}\cdot100\%=10\%\end{matrix}\right.\)
a) 2Al + 6HCl --> 2AlCl3 + 3H2
b)
\(n_{Al}=\dfrac{6,75}{27}=0,25\left(mol\right)\); \(n_{HCl}=0,6.1=0,6\left(mol\right)\)
Xét tỉ lệ: \(\dfrac{0,25}{2}>\dfrac{0,6}{6}\) => Al dư, HCl hết
PTHH: 2Al + 6HCl --> 2AlCl3 + 3H2
0,2<--0,6------------->0,3
=> V = 0,3.22,4 = 6,72 (l)
c) \(m_{Al\left(dư\right)}=\left(0,25-0,2\right).27=1,35\left(g\right)\)
d) \(n_{CuO}=\dfrac{20}{80}=0,25\left(mol\right)\)
PTHH: CuO + H2 --to--> Cu + H2O
Xét tỉ lệ: \(\dfrac{0,25}{1}< \dfrac{0,3}{1}\) => CuO hết
PTHH: CuO + H2 --to--> Cu + H2O
0,25---------->0,25
=> mCu = 0,25.64 = 16 (g)
a) 2Al + 6HCl --> 2AlCl3 + 3H2
b)
\(n_{Al}=\dfrac{6,75}{27}=0,25\left(mol\right)\); \(n_{HCl}=0,6.1=0,6\left(mol\right)\)
Xét tỉ lệ: \(\dfrac{0,25}{2}>\dfrac{0,6}{6}\) => Al dư, HCl hết
PTHH: 2Al + 6HCl --> 2AlCl3 + 3H2
0,6-------------->0,3
=> V = 0,3.22,4 = 6,72 (l)
d) \(n_{CuO}=\dfrac{20}{80}=0,25\left(mol\right)\)
PTHH: CuO + H2 --to--> Cu + H2O
Xét tỉ lệ: \(\dfrac{0,25}{1}< \dfrac{0,3}{1}\) => CuO hết
PTHH: CuO + H2 --to--> Cu + H2O
0,25---------->0,25
=> mCu = 0,25.64 = 16 (g)
a) \(CaO+2HCl\rightarrow CaCl_2+H_2O\)
\(HCl+NaOH\rightarrow NaCl+H_2O\)
b) \(n_{CaO}=\dfrac{2,8}{56}=0,05\left(mol\right);n_{NaOH}=\dfrac{100.4\%}{40}=0,1\left(mol\right)\)
\(m_{muối}=m_{CaCl_2}+m_{NaCl}=0,05.111+0,1.58,5=11,4\left(g\right)\)
c) \(CM_{HCl}=\dfrac{0,05.2+0,1}{0,5}=0,4M\)
\(n_{Zn}=\dfrac{65}{65}=1\left(mol\right)\)
\(Zn+2HCl\rightarrow ZnCl_2+H_2\uparrow\)
1 1 1
\(b,V_{H_2}=1.22,4=22,4\left(l\right)\)
\(c,m_{ZnCl_2}=1.136=136\left(g\right)\)
\(m_{ddZnCl_2}=65+\left(\dfrac{2.36,5:15}{100}\right)-2\approx549,67\left(g\right)\)
\(C\%_{ZnCl_2}=\dfrac{136}{549,67}.100\%\approx24,74\left(\%\right)\)
\(d,H_2+CuO\underrightarrow{t^o}Cu+H_2O\)
trc p/u 1 0,1875
p/u : 0,1875 0,1875 0,1875
sau: 0,8125 0 0,1875
\(n_{CuO}=\dfrac{15}{80}=0,1875\left(mol\right)\)
\(m_{Cu}=0,1875.64=12\left(g\right)\)
a)
$Al_2O_3 + 6HCl \to 2AlCl_3 + 3H_2O$
b)
n HCl = 0,4.1,5 = 0,6(mol)
n Al2O3 = 1/6 n HCl = 0,1(mol) => m = 0,1.102 = 10,2(gam)
n AlCl3 = 1/3 n HCl = 0,2(mol) => CM AlCl3 = 0,2/0,4 = 0,5M
\(n_{CuO}=a\left(mol\right),n_{Fe_2O_3}=b\left(mol\right)\)
\(m=80a+160b=20\left(g\right)\left(1\right)\)
\(n_{HCl}=0.2\cdot3.5=0.7\left(mol\right)\)
\(CuO+2HCl\rightarrow CuCl_2+H_2O\)
\(Fe_2O_3+6HCl\rightarrow2FeCl_3+3H_2O\)
\(n_{HCl}=2a+6b=0.7\left(mol\right)\left(2\right)\)
\(\left(1\right),\left(2\right):a=0.05,b=0.1\)
\(m_{CuO}=0.05\cdot80=4\left(g\right)\)
\(m_{Fe_2O_3}=0.1\cdot160=16\left(g\right)\)
a) CaCO3 + 2HCl → CaCl2 + H2O + CO2
b) nCaCO3 = \(\dfrac{450}{100}\)=4,5 mol
=> nHCl phản ứng = 4,5.2 = 9mol
<=> mHCl = 9 . 36,5 = 328,5 gam
c) nCO2 = nCaCO3 = 4,5 mol => V CO2 = 4,5 . 22,4 = 100,8 lít
\(CuO+2HCl\rightarrow CuCl_2+H_2O\)
\(n_{HCl}=0,2.2=0,4mol\)
\(\Rightarrow n_{CuO}=0,2mol\)
\(\Rightarrow m_{CuO}=0,2.80=16g\)
PTHH: \(CuO+2HCl\rightarrow CuCl_2+H_2O\)
Làm gộp luôn cho nhanh
Ta có: \(n_{HCl}=0,2\cdot2=0,4\left(mol\right)\) \(\Rightarrow n_{CuO}=n_{CuCl_2}=0,2mol\)
\(\Rightarrow\left\{{}\begin{matrix}m_{CuO}=0,2\cdot80=16\left(g\right)\\C_{M_{CuCl_2}}=\dfrac{0,2}{0,2}=1\left(M\right)\end{matrix}\right.\)