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\(n_{Cu}=\dfrac{6,4}{64}=0,1\left(mol\right)\)
pthh: \(H_2+CuO\underrightarrow{t^o}Cu+H_2O\)
0,1 0,1 0,1
=>\(\left\{{}\begin{matrix}V_{H_2}=0,1.22,4=2,24\left(l\right)\\m_{H_2O}=0,1.18=1,8\left(g\right)\end{matrix}\right.\)
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 )
\(m_{Cu}=0,05.64=3,2g\)
Gọi số mol H2 phản ứng là a (mol)
=> \(n_{H_2O}=a\left(mol\right)\)
Theo ĐLBTKL: \(32+2a=28,8+18a\)
=> a = 0,2 (mol)
\(Đặt:n_{CuO\left(ban.đầu\right)}=\dfrac{32}{80}=0,4\left(mol\right)\\ CuO+H_2\rightarrow\left(t^o\right)Cu+H_2O\)
TH1: Giả sử CuO p.ứ hết.
\(\Rightarrow n_{Cu}=n_{CuO}=0,4\left(mol\right)\\ \Rightarrow m_{rắn}=m_{Cu}=64.0,4=25,6\left(g\right)< 28,8\left(g\right)\)
=> CuO dư => Loại TH1
TH2: CuO dư
\(Đặt:n_{CuO\left(p.ứ\right)}=n_{H_2}=a\left(mol\right)\left(a>0\right)\)
=> Rắn bao gồm Cu (sau phản ứng) và CuO (dư)
\(Ta.có:m_{rắn}=28,8\left(g\right)\\ \Leftrightarrow\left(0,4-a\right).80+a.64=28,8\\ \Leftrightarrow a=0,2\\ \Rightarrow n_{H_2}=0,2\left(mol\right)\)
\(n_{Fe_2O_3}=\dfrac{32}{160}=0.2\left(mol\right)\)
\(Fe_2O_3+3H_2\underrightarrow{^{^{t^o}}}2Fe+3H_2O\)
\(0.2........0.6........0.4........0.6\)
\(V_{H_2}=0.6\cdot22.4=13.44\left(l\right)\)
\(m_{Fe}=0.4\cdot56=22.4\left(g\right)\)
Số phân tử H2O là : \(0.6\cdot6\cdot10^{23}=3.6\cdot10^{23}\left(pt\right)\)
a, \(n_{Fe_2O_3}=\dfrac{32}{160}=0,2\left(mol\right)\)
PTHH: 3H2 + Fe2O3 ---to→ 2Fe + 3H2O
Mol: 0,6 0,2 0,4 0,6
b, \(V_{H_2}=0,6.22,4=13,44\left(l\right)\)
c, \(m_{Fe}=0,4.56=22,4\left(g\right)\)
d, \(N=0,6.6.10^{23}=3,6.10^{23}\) (phân tử)
a)PTHH: CuO+H2=>Cu+H2O
b) nCu=0,05g
PTHH: CuO+H2=>Cu+H2O
0,05<-0,05<-0,05->0,05
=> VH2 =0,05.22,4=1,12 lit
a)\(n_{H_2}=\dfrac{8,96}{22,4}=0,4mol\)
\(2H_2+O_2\underrightarrow{t^o}2H_2O\)
0,4 0,2 0,4
\(V_{O_2}=0,2\cdot22,4=4,48l\)
\(V_{kk}=5V_{O_2}=5\cdot4,48=22,4l\)
b)\(CuO+H_2\rightarrow Cu+H_2O\)
0,4 0,4
\(m_{H_2O}=0,4\cdot18=7,2g\)
\(n_{Cu}=\dfrac{6,4}{64}=0,1mol\)
\(CuO+H_2\rightarrow\left(t^o\right)Cu+H_2O\)
0,1 0,1 ( mol )
\(\left\{{}\begin{matrix}m_{CuO}=0,1.80=8g\\m_{FeO}=12-8=4g\end{matrix}\right.\)
a)
FeO + H2 --to--> Fe + H2O
CuO + H2 --to--> Cu + H2O
b) \(n_{Cu}=\dfrac{6,4}{64}=0,1\left(mol\right)\)
PTHH: CuO + H2 --to--> Cu + H2O
0,1<--0,1<-----0,1
=> \(m_{FeO}=12-0,1.80=4\left(g\right)\)
=> \(n_{FeO}=\dfrac{4}{72}=\dfrac{1}{18}\left(mol\right)\)
FeO + H2 --to--> Fe + H2O
\(\dfrac{1}{18}\)-->\(\dfrac{1}{18}\)----->\(\dfrac{1}{18}\)
=> \(V_{H_2}=\left(0,1+\dfrac{1}{18}\right).22,4=\dfrac{784}{225}\left(l\right)\)
c) \(m_{Fe}=\dfrac{1}{18}.56=\dfrac{28}{9}\left(g\right)\)
d) \(\left\{{}\begin{matrix}m_{CuO}=0,1.80=8\left(g\right)\\m_{FeO}=4\left(g\right)\end{matrix}\right.\)
a)PTHH: CuO+H2=>Cu+H2O
nCu=0,05g
PTHH: CuO+H2=>Cu+H2O
0,05<-0,05<-0,05->0,05
=> VH2 =0,05.22,4=1,12 lit
nO2=2,2422,4=0,1(mol)nO2=2,2422,4=0,1(mol)
PTHH: 2Cu + O2 --to--> 2CuO
0,1-------->0,2
=> mCuO = 0,2.80 = 16(g)
a)PTHH: CuO+H2=>Cu+H2O
nCu=0,05g
PTHH: CuO+H2=>Cu+H2O
0,05<-0,05<-0,05->0,05
=> VH2 =0,05.22,4=1,12 lit
b) mH20=18.0,05=0,9 gam