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a, \(n_{Zn}=\dfrac{13}{65}=0,2\left(mol\right)\)
PTHH: Zn + 2HCl → ZnCl2 + H2
Mol: 0,2 0,2 0,2
b, \(V_{H_2}=0,2.22,4=4,48\left(l\right)\)
c, \(m_{FeCl_2}=0,2.127=25,4\left(g\right)\)
d,
PTHH: H2 + CuO → Cu + H2O
Mol: 0,2 0,2
\(m_{Cu}=0,2.64=12,8\left(g\right)\)
a.b.c.\(n_{Zn}=\dfrac{16,25}{65}=0,25mol\)
\(Zn+2HCl\rightarrow ZnCl_2+H_2\)
0,25 0,25 0,25 ( mol )
\(V_{H_2}=0,25.22,4=5,6l\)
\(m_{ZnCl_2}=0,25.136=34g\)
d.\(CuO+H_2\rightarrow\left(t^o\right)Cu+H_2O\)
0,25 0,25 ( mol )
\(m_{Cu}=0,25.64=16g\)
a,\(n_{Zn}=\dfrac{6,5}{65}=0,1\left(mol\right)\)
PTHH: Zn + 2HCl ---> ZnCl2 + H2
0,1--------------->0,1------>0,1
b, => \(\left\{{}\begin{matrix}C_{M\left(ZnCl_2\right)}=\dfrac{0,1}{\dfrac{6}{1000}}=\dfrac{50}{3}M\\V_{H_2}=0,1.22,4=2,24\left(l\right)\end{matrix}\right.\)
c, \(n_{O_2}=\dfrac{2,24}{22,4}=0,1\left(mol\right)\)
PTHH: 2H2 + O2 --to--> 2H2O
LTL: \(\dfrac{0,1}{2}< 0,1\)=> O2 dư
Theo pt: \(n_{O_2}=\dfrac{1}{2}n_{H_2}=\dfrac{1}{2}.0,1=0,05\left(mol\right)\)
\(\Rightarrow\left\{{}\begin{matrix}m_{O_2\left(dư\right)}=\left(0,1-0,05\right).32=1,6\left(g\right)\\V_{O_2\left(dư\right)}=\left(0,1-0,05\right).22,4=1,12\left(l\right)\end{matrix}\right.\)
a, PT: \(Zn+2HCl\rightarrow ZnCl_2+H_2\)
b, Ta có: \(n_{Zn}=\dfrac{32,5}{65}=0,5\left(mol\right)\)
Theo PT: \(n_{H_2}=n_{Zn}=0,5\left(mol\right)\)
\(\Rightarrow V_{H_2}=0,5.22,4=11,2\left(l\right)\)
c, Theo PT: \(n_{ZnCl_2}=n_{Zn}=0,5\left(mol\right)\)
\(\Rightarrow m_{ZnCl_2}=0,5.136=68\left(g\right)\)
\(n_{HCl}=0,2.2=0,4\left(mol\right)\\ a.Zn+2HCl\rightarrow ZnCl_2+H_2\\ b.0,2........0,4.......0,2.......0,2\left(mol\right)\\ m=m_{Zn}=0,2.65=13\left(g\right)\\ c.m_{ZnCl_2}=136.0,2=27,2\left(g\right)\\ d.V_{H_2\left(đktc\right)}=0,2.22,4=4,48\left(l\right)\)
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
\(V_{H_2}=0,1\cdot22,4=2,24l\)
\(m_{HCl}=0,2\cdot36,5=7,3g\)
a) Zn + 2HCl → ZnCl2 + H2
b) Theo PTHH :
n H2 = n Zn = 13/65 = 0,2 (mol)
=> V H2 = 0,2.22,4 = 4,48(lít)
c) n ZnCl2 = n Zn = 0,2(mol)
=> m ZnCl2 = 0,2.136 = 27,2(gam)
d) CM ZnCl2 = 0,2/0,2 = 1M