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\(a.n_{Zn}=\dfrac{13}{65}=0,2\left(mol\right)\\ Zn+2HCl\rightarrow ZnCl_2+H_2\\ n_{ZnCl_2}=n_{H_2}=n_{Zn}=0,2\left(mol\right)\\ m_{ZnCl_2}=0,2.136=27,2\left(g\right)\\ V_{H_2}=0,2.22,4=4,48\left(l\right)\\ b.n_{CuO}=\dfrac{12}{80}=0,15\left(mol\right)\\ CuO+H_2-^{t^o}\rightarrow Cu+H_2O\\ LTL:\dfrac{0,15}{1}< \dfrac{0,2}{1}\\ \Rightarrow H_2dưsauphảnứng\\ n_{Cu}=n_{H_2\left(pứ\right)}=n_{H_2O}=n_{CuO}=0,15\left(mol\right)\\ m_{Cu}=0,15.64=9,6\left(g\right)\\ m_{H_2\left(dư\right)}=\left(0,2-0,15\right).2=0,1\left(g\right)\\ m_{H_2O}=0,15.18=2,7\left(g\right)\)
nZn = 13/65 = 0,2 (mol)
PTHH: Zn + H2SO4 -> ZnSO4 + H2
Mol: 0,2 ---> 0,2 ---> 0,2 ---> 0,2
VH2 = 0,2 . 22,4 = 4,48 (l)
nCuO = 32/80 = 0,4 (mol)
PTHH: CuO + H2 -> (r°) Cu + H2O
LTL: 0,4 > 0,2 => CuO dư
nCuO (p/ư) = nCu = 0,2 (mol)
mCuO (dư) = (0,4 - 0,2) . 80 = 16 (g)
mCu = 0,2 . 64 = 12,8 (g)
%mCuO = 16/(16 + 12,8) = 55,55%
%mCu = 100% - 55,55 = 45,45%
\(n_{Zn}=\dfrac{3,25}{65}=0,05mol\)
a)\(Zn+2HCl\rightarrow ZnCl_2+H_2\)
0,05 0,1 0,05 0,05
b)\(m_{ZnCl_2}=0,05\cdot136=6,8g\)
c)\(V_{H_2}=0,05\cdot22,4=1,12l\)
\(n_{Zn}=\dfrac{13}{65}=0,2(mol)\\ a,PTHH:Zn+2HCl\to ZnCl_2+H_2\\ b,n_{HCl}=2n_{Zn}=0,4(mol)\\ \Rightarrow m_{HCl}=0,4.36,5=14,6(g)\\ c,n_{H_2}=n_{Zn}=0,2(mol)\\ \Rightarrow V_{H_2}=0,2.22,4=4,48(l)\)
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)
\(n_{Al}=\dfrac{5.4}{27}=0.2\left(mol\right)\)
\(2Al+6HCl\rightarrow2AlCl_3+3H_2\)
\(0.2.........................0.2.......0.3\)
\(m_{AlCl_3}=0.2\cdot133.5=26.7\left(g\right)\)
\(n_{CuO}=\dfrac{32}{160}=0.2\left(mol\right)\)
\(CuO+H_2\underrightarrow{^{t^0}}Cu+H_2O\)
\(1..........1\)
\(0.2........0.3\)
\(LTL:\dfrac{0.2}{1}< \dfrac{0.3}{1}\Rightarrow H_2dư\)
\(n_{Cu}=0.2\left(mol\right)\)
\(m_{Cu}=0.2\cdot64=12.8\left(g\right)\)
Em xem lại đề vì chất rắn chỉ có Cu không có CuO nhé !
Bài 3 :
a. \(n_{Zn}=\dfrac{13}{65}=0,2\left(mol\right)\)
PTHH : Zn + 2HCl -> ZnCl2 + H2
0,2 0,2 0,2
b. \(m_{ZnCl_2}=0,2.136=27,2\left(g\right)\)
c. PTHH : CuO + H2 ----to----> Cu + H2O
0,2 0,2
\(m_{Cu}=0,2.64=12,8\left(g\right)\)
\(n_{Zn}=\dfrac{13}{65}=0,2\left(mol\right);n_{H_2}=\dfrac{2,24}{22,4}=0,1\left(mol\right)\\a, Zn+2HCl\rightarrow ZnCl_2+H_2\\ b,V\text{ì}:\dfrac{0,2}{1}>\dfrac{0,1}{1}\Rightarrow Zn\text{dư}\\ \Rightarrow n_{Zn\left(p.\text{ứ}\right)}=n_{ZnCl_2}=n_{H_2}=0,1\left(mol\right)\\b, m_{Zn\left(p.\text{ứ}\right)}=0,1.65=6,5\left(g\right)\\ n_{HCl}=0,1.2=0,2\left(mol\right)\\ m_{HCl}=0,2.36,5=7,3\left(g\right)\\ d,m_{ZnCl_2}=136.0,1=13,6\left(g\right)\)
\(n_{Zn}=\dfrac{m_{Zn}}{M_{Zn}}=\dfrac{13}{65}=0,2mol\)
\(Zn+2HCl\rightarrow ZnCl_2+H_2\)
0,2 0,2 0,2 ( mol )
\(V_{H_2}=n_{H_2}.22,4=0,2.22,4=4,48l\)
\(m_{ZnCl_2}=n_{ZnCl_2}.M_{ZnCl_2}=0,2.136=27,2g\)
nZn = 13/65 = 0,2 (mol)
PTHH:
Zn + 2HCl -> ZnCl2 + H2
0,2 ---> 0,4 ---> 0,2 ---> 0,2
VH2 = 0,2 . 22,4 = 4,48 (l)
mZnCl2 = 136 . 0,2 = 27,2 (g)
a. \(n_{Zn}=\dfrac{6.5}{65}=0,1\left(mol\right)\)
PTHH : Zn + 2HCl -> ZnCl2 + H2
0,1 0,2 0,1
b. \(V_{H_2}=0,1.22,4=2,24\left(l\right)\)
c. \(m_{HCl}=0,2.36,5=7,3\left(g\right)\)
\(n_{Zn}=\dfrac{6,5}{65}=0,1mol\)
\(Zn+2HCl\rightarrow ZnCl_2+H_2\)
0,1 0,2 0,1
\(V_{H_2}=0,1\cdot22,4=2,24l\)
\(m_{HCl}=0,2\cdot36,5=7,3g\)
a.b.c.\(n_{Zn}=\dfrac{m}{M}=\dfrac{13}{65}=0,2mol\)
\(Zn+2HCl\rightarrow ZnCl_2+H_2\)
0,2 0,2 0,2 ( mol )
\(m_{ZnCl_2}=n.M=0,2.136=27,2g\)
\(V_{H_2}=n.22,4=0,2.22,4=4,48l\)
d.\(n_{CuO}=\dfrac{m}{M}=\dfrac{32}{80}=0,4mol\)
\(CuO+H_2\rightarrow\left(t^o\right)Cu+H_2O\)
0,4 > 0,2 ( mol )
0,2 0,2 0,2 ( mol )
\(m_{chất.rắn}=m_{CuO\left(dư\right)}+m_{Cu}=0,2.80+0,2.64=16+12,8=28,8g\)
\(\%m_{CuO}=\dfrac{16}{28,8}.100=55,55\%\)
\(\%m_{Cu}=100\%-55,55\%=44,45\%\)