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a, \(H_2SO_4+Zn=ZnSO_4+H_2\uparrow\)
b,
\(n_{Zn}=\frac{13}{65}=0,2\left(mol\right)\)
Theo PTHH : \(n_{Zn}=n_{H_2}=0,2\left(mol\right)\)
\(\Rightarrow V_{H_2=}=n_{H_2}\cdot22,4=0,2\cdot22,4=4,48\left(l\right)\)
a) \(Mg+2HCl\rightarrow MgCl_2+H_2\)
\(n_{Mg}=\dfrac{2,4}{24}=0,1\left(mol\right)\)
Theo PTHH ta có: \(n_{MgCl_2}=n_{Mg}=0,1\left(mol\right)\)
\(\Rightarrow m_{MgCl_2}=n_{MgCl_2}.M_{MgCl_2}=0,1.95=9,5\left(g\right)\)
b) Theo PTHH ta có: \(n_{H_2}=n_{Mg}=0,1\left(mol\right)\)
\(\Rightarrow V_{H_2}=n_{H_2}.22,4=0,1.22,4=2,24\left(l\right)\)
c) \(2H_2+O_2\rightarrow2H_2O\)
Theo PTHH: \(n_{H_2O}=\dfrac{0,1.2}{2}=0,1\left(mol\right)\)
\(\Rightarrow m_{H_2O}=n_{H_2O}.M_{H_2O}=0,1.18=1,8\left(g\right)\)
a)mMg= 2,4/24=0,1(mol) nMgCl2=0,1.1/1=0,1 (mol) mMgCl2= 0,1.95=9,5(g) b)nH2=0,1.1/1=0,1(mol) v=n.22,4=2,24(lít
3/
nFe= 8.4/56=0.15mol
Fe +2HCl --> FeCl2 + H2
0.15__0.3____________0.15
VH2= 0.15*22.4=3.36l
mHCl= 0.3*36.5=10.95g
mddHCl= 10.96*100/10.95=100g
a, \(Zn+2HCl\rightarrow ZnCl_2+H_2\)
Ta có: \(n_{Zn}=\dfrac{13}{65}=0,2\left(mol\right)\)
Theo PT: \(n_{ZnCl_2}=n_{H_2}=n_{Zn}=0,2\left(mol\right)\)
\(\Rightarrow V_{H_2}=0,2.24,79=4,958\left(l\right)\)
b, \(n_{HCl}=2n_{Zn}=0,4\left(mol\right)\Rightarrow V_{HCl}=\dfrac{0,4}{2}=0,2\left(l\right)\)
c, \(C_{M_{ZnCl_2}}=\dfrac{0,2}{0,2}=1\left(M\right)\)
\(n_{Al}=\dfrac{5,4}{27}=0,2\left(mol\right)\\ n_{H_2SO_4}=0,5.0,1=0,05\left(mol\right)\\ pthh:2Al+3H_2SO_4\rightarrow Al_2\left(SO_4\right)_3+3H_2\)
\(LTL:\dfrac{0,2}{2}>\dfrac{0,05}{3}\)
=> Al dư
\(n_{H_2}=n_{H_2SO_4}=0,05\left(mol\right)\)
\(V_{H_2}=0,05.22,4=1,12l\\
C_M=\dfrac{\dfrac{1}{60}}{0,1}=0,16M\)
\(n_{CuO}=\dfrac{12}{80}=0,15\left(mol\right)\)
\(n_{HCl}=2.0,2=0,4\left(mol\right)\)
PTHH :
\(CuO+2HCl\rightarrow CuCl_2+H_2\uparrow\)
trc p/ư: 0,15 0,4
p/ư : 0,15 0,3 0,15 0,15
sau p/ư : 0 0,1 0,15 0,15
--> sau p/ư : HCl dư
\(a,m_{CuCl_2}=0,15.135=20,25\left(g\right)\)
\(b,C_{M\left(CuCl_2\right)}=\dfrac{0,15}{0,2}=0,75\left(M\right)\)
\(a)n_{CuO}=\dfrac{12}{80}=0,15\left(mol\right)\\ n_{HCl}=0,2.2=0,4\left(mol\right)\\ CuO+2HCl\xrightarrow[]{}CuCl_2+H_2\\ \dfrac{0,15}{1}< \dfrac{0,4}{2}\Rightarrow HCl.dư\\ n_{CuCl_2}=n_{CuO}=n_{H_2}=0,15mol\\ m_{CuCl_2}=0,15.135=20,25\left(g\right)\\ b)C_{MCuCl_2}=\dfrac{0,15}{0,2}=0,75\left(M\right)\\ n_{HCl\left(pư\right)}=0,15.2=0,3\left(mol\right)\\ n_{HCl\left(dư\right)}=0,4-0,3=0,1\left(mol\right)\\ C_{MHCl\left(dư\right)}=\dfrac{0,1}{0,2}=0,5\left(M\right)\)
nHCl=0,6 mol
FeO+2HCl-->FeCl2+ H2O
x mol x mol
Fe2O3+6HCl-->2FeCl3+3H2O
x mol 2x mol
72x+160x=11,6 =>x=0,05 mol
A/ CFeCl2=0,05/0,3=1/6 M
CFeCl3=0,1/0,3=1/3 M
CHCl du=(0,6-0,4)/0,3=2/3 M
B/
NaOH+ HCl-->NaCl+H2O
0,2 0,2
2NaOH+FeCl2-->2NaCl+Fe(OH)2
0,1 0,05
3NaOH+FeCl3-->3NaCl+Fe(OH)3
0,3 0,1
nNaOH=0,6
CNaOH=0,6/1,5=0,4M
\(n_{Zn}=\dfrac{6,5}{65}=0,1mol\)
a)\(Zn+2HCl\rightarrow ZnCl_2+H_2\)
0,1 0,2 0,1 0,1
b)\(V_{H_2}=0,1\cdot22,4=2,24l\)
c)\(C_{M_{H_2SO_4}}=\dfrac{0,2}{0,2}=1M\)
nSO2= 12.8/64=0.2 mol
SO2 + H2O --> H2SO3
0.2___________0.2
Dung dịch tạo thành làm quỳ tím hóa đỏ
CM H2SO3= 0.2/0.4=0.5M
nZn= 9.75/65=0.15 mol
Zn + H2SO3 --> ZnSO3 + H2
Bđ: 0.15 ___0.2
Pư: 0.15___0.15___________0.15
Kt: 0______0.05____________0.15
VH2= 0.15*22.4=3.36l
nK= 11.7/39=0.3 mol
K + H2O --> KOH + 1/2H2
0.3_________0.3____0.15
VH2= 0.15*22.4=3.36l
CM KOH= 0.3/0.5=0.6M
nFe2O3= 16/160=0.1 mol
Fe2O3 + 3H2 -to-> 2Fe + 3H2O
Bđ: 0.1_____0.15
Pư: 0.05____0.15_____0.1
Kt: 0.05_____0_______0.1
mFe=0.1*56=5.6g