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a)
Zn + 2HCl → ZnCl2 + H2
b) nZn = \(\dfrac{3,5}{65}\)=\(\dfrac{7}{130}\) mol
Theo tỉ lệ phản ứng => nH2 = nZn= \(\dfrac{7}{130}\)mol
<=> V H2 = \(\dfrac{7}{130}\).22,4 = 1,206 lít
c) nZnCl2 = nZn => mZnCl2 = \(\dfrac{7}{130}\).136= 7,32 gam
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
\(V_{H_2}=0,1\cdot22,4=2,24l\)
\(m_{HCl}=0,2\cdot36,5=7,3g\)
\(n_{Zn}=\dfrac{13}{65}=0,2\left(mol\right)\)
\(n_{FeO}=\dfrac{64,8}{72}=0,9\left(mol\right)\)
PTHH: Zn + 2HCl ---> ZnCl2 + H2
0,2------------------------->0,2
=> VH2 = 0,2.22,4 = 4,48 (l)
PTHH: FeO + H2 --to--> Fe + H2O
LTL: 0,9 > 0,2 => FeO dư
Theo pthh: nFe = nH2 = 0,2 (mol)
=> mFe = 0,2.56 =11,2 (g)
\(a.Zn+2HCl\rightarrow ZnCl_2+H_2\\ b.n_{Zn}=n_{ZnCl_2}=0,1\left(mol\right)\\ \Rightarrow m_{ZnCl_2}=0,1.136=13,6\left(g\right)\\ c.n_{H_2}=n_{Zn}=0,1\left(mol\right)\\ \Rightarrow V_{H_2}=0,1.22,4=2,24\left(l\right)\)
a) Zn + 2HCl → ZnCl2 + H2
b) mZnCl2 = 0,1 . 136 = 13,6 gam
c) nZn = 6,5/65 = 0,1 mol . Theo tỉ lệ pư => nH2 = nZn = nZnCl2 =0,1 mol <=> VH2(đktc) = 0,1.22,4 = 2,24 lít.
\(n_{Zn}=\dfrac{m}{M}=\dfrac{16,25}{65}=0,25\left(mol\right)\\ PTHH:Zn+H_2SO_4->ZnSO_4+H_2\)
tỉ lệ 1 : 1 : 1 : 1
n(mol) 0,25-->0,25------->0,25------>0,25
\(V_{H_2\left(dktc\right)}=n\cdot22,4=0,25\cdot22,4=5,6\left(l\right)\\ m_{ZnSO_4}=n\cdot M=0,25\cdot\left(65+32+16\cdot4\right)=40,25\left(g\right)\)
Câu 2:
\(n_{O_2}=\dfrac{6,72}{22,4}=0,3\left(mol\right)\)
PTHH: \(2KMnO_4\xrightarrow[]{t^o}K_2MnO_4+MnO_2+O_2\)
0,6<------------------------------------0,3
\(\Rightarrow m_{KMnO_4}=0,6.158=94,8\left(g\right)\)
Câu 3:
\(n_{H_2}=\dfrac{4,48}{22,4}=0,2\left(mol\right)\)
PTHH: \(Zn+2HCl\rightarrow ZnCl_2+H_2\)
0,2<-----------------------0,2
=> mZn = 0,2.65 = 13 (g)
Câu 4:
\(n_{Fe}=\dfrac{22,4}{56}=0,4\left(mol\right)\)
PTHH: \(Fe+2HCl\rightarrow FeCl_2+H_2\)
0,4------------------------->0,4
\(CuO+H_2\xrightarrow[]{t^o}Cu+H_2O\)
0,4<---0,4
\(\Rightarrow m_{CuO}=0,4.80=32\left(g\right)\)
\(a,n_{Zn}=\dfrac{0,65}{65}=0,01\left(mol\right)\)
PTHH: \(Zn+2HCl\rightarrow ZnCl_2+H_2\)
0,01--->0,02---->0,01---->0,01
\(V_{H_2}=0,01.22,4=0,224\left(l\right)\\ b,m_{ZnCl_2}=0,01.136=1,36\left(g\right)\\ V_{ddHCl}=\dfrac{0,02}{2}=0,01\left(l\right)\)
Zn+2HCl->Zncl2+H2
0,4----0,8----0,4----0,4
n Zn=0,4 mol
VH2=0,4.22,4=8,96l
m ZnCl2=0,4.136=54,4g
2H2+O2-to>2H2O
0,4------0,2----0,4
n O2=0,2 mol
=>pứ hết
=>m H2O=0,4.18=7,2g
a.b.\(n_{Zn}=\dfrac{26}{65}=0,4mol\)
\(Zn+2HCl\rightarrow ZnCl_2+H_2\)
0,4 0,4 0,4 ( mol )
\(m_{ZnCl_2}=0,4.136=54,4g\)
\(V_{H_2}=0,4.22,4=8,96l\)
c.\(n_{O_2}=\dfrac{4,48}{22,4}=0,2mol\)
\(2H_2+O_2\rightarrow\left(t^o\right)2H_2O\)
0,4 = 0,2 ( mol )
0,4 0,2 0,4 ( mol )
\(m_{H_2O}=0,4.18=7,2g\)