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Zn + 2HCl --> ZnCl2 + H2
\(n_{Zn}=\dfrac{26}{65}=0,4\left(mol\right)\)
=> \(m_{ZnCl_2}=0,4.136=54,4\left(g\right)\)
\(V_{H_2}=0,4.22,4=8,96\left(l\right)\)
\(nZn=\dfrac{26}{65}=0,4mol\)
\(Zn+2HCl\rightarrow ZnCl_2+H_2\)
0,4-->0,8----->0,4------->0,4
\(mZnCl_2=136.0,4=54,4g\)
\(VH_2=0,4.22,4=8,96lít\)
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) 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, 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: \(n_{ZnCl_2}=n_{Zn}=0,5\left(mol\right)\)
\(\Rightarrow m_{ZnCl_2}=0,5.136=68\left(g\right)\)
\(n_{HCl}=0,25.2=0,5\left(mol\right)\\ a,PTHH:Zn+2HCl\rightarrow ZnCl_2+H_2\\ b,n_{Zn}=n_{H_2}=n_{ZnCl_2}=\dfrac{0,5}{2}=0,25\left(mol\right)\\ m_{Zn}=0,25.65=16,25\left(g\right)\\ c,V_{H_2\left(đktc\right)}=0,25.22,4=5,6\left(l\right)\)
Không biết đúng không nữa;-;;;
a) PTHH: Zn + 2HCl -> ZnCl2 + H2
b) HCl=250ml=0,25l
n2HCl= V/22,4= 0,5/22,4= 0,02(mol)
Zn + 2HCl -> ZnCl2 + H2
1 2 1 1
0,01 <-0,5--------------> 0,01
mZn= n.M= 0,01.65= 0,65(gam)
c) VH2=n . 22,4= 0,01 . 22,4= 0,224(l)
\(n_{Zn}=\dfrac{1,3}{65}=0,02\left(mol\right)\\
pthhZn+2HCl\rightarrow ZnCl_2+H_2\)
0,02 0,02 0,02
\(m_{ZnCl_2}=136.0,02=2,72\left(g\right)\\
V_{H_2}=0,02.22,4=0,448\left(l\right)\)
\(Zn+2HCl\rightarrow ZnCl_2+H_2\)
a: \(n_{Zn}=\dfrac{52}{65}=0.8\left(mol\right)\)
\(\Leftrightarrow n_{HCl}=1.6\left(mol\right)\)
hay \(n_{H_2}=0.8\left(mol\right)\)
\(V_{H_2}=0.8\cdot22.4=17.92\left(lít\right)\)
b: \(m_{ZnCl_2}=0.8\cdot136=108.8\left(g\right)\)
\(m_{H_2}=0.8\cdot2=1.6\left(g\right)\)
\(n_{Zn}=\dfrac{52}{65}=0,8\left(mol\right)\\ Zn+2HCl\rightarrow ZnCl_2+H_2\\ n_{ZnCl_2}=n_{H_2}=n_{Zn}=0,8\left(mol\right)\\ a,V_{H_2\left(đktc\right)}=0,8.22,4=17,92\left(l\right)\\ b,n_{HCl}=2.0,8=1,6\left(mol\right)\\ C1:m_{ZnCl_2}=0,8.136=108,8\left(g\right);m_{H_2}=0,8.2=1,6\left(g\right)\\ \Rightarrow m_{thu.được}=m_{ZnCl_2}+m_{H_2}=108,8+1,6=110,4\left(g\right)\\ C2:m_{HCl}=1,6.36,5=58,4\left(g\right)\\ \Rightarrow m_{thu.được}=m_{tham.gia}=m_{Zn}+m_{HCl}=52+58,4=110,4\left(g\right)\)
\(n_{Zn}=\dfrac{19,5}{65}=0,3\left(mol\right)\)
PTHH :
\(Zn+2HCl\rightarrow ZnCl_2+H_2\uparrow\)
0,3 0,6 0,3 0,3
\(a,V_{H_2}=n.22,4=0,3.22,4=6,72\left(l\right)\)
\(m_{ZnCl_2}=0,3.136=40,8\left(g\right)\)
\(b,V_{ddHCl}=\dfrac{n}{C_M}=\dfrac{0,6}{2}=0,3\left(l\right)\)
\(c,Fe_2O_3+3H_2\rightarrow2Fe+3H_2O\)
0,1 0,3
\(n_{Fe_2O_3}=\dfrac{16}{160}=0,1\left(mol\right)\)
Ta có :
\(\dfrac{0,1}{1}=\dfrac{0,3}{3}\)
nên không chất nào dư
Zn+2HCl-->ZnCl2+H2
0,1-0,2------------------0,1 mol
nZn=6,5\65=0,1 mol
=>mHCl=0,2.36,5=7,3 g
=>VH2=0,1.22,4=2,24 l
\(Zn+2HCl-->ZnCl2+H2\)
b) \(n_{Zn}=\frac{6,5}{65}=0,1\left(mol\right)\)
\(n_{HCl}=2n_{Zn}=0,2\left(mol\right)\)
\(m_{HCl}=0,2.36,5=7,3\left(g\right)\)
c) \(n_{H2}=n_{Zn}=0,1\left(mol\right)\)
\(V_{H2}=0,1.22,4=2,24\left(l\right)\)
nZn = m/M = 26/65 = 0,4 (mol)
pthh: Zn + 2HCl -> ZnCl2 + H2
........1mol...2mol........1 mol.......1 mol
.......0,4mol..x mol........y mol........z mol
a, Từ ptpu ta có: \(n_{H_2}=z=\dfrac{0,4.1}{1}=0,4\left(mol\right)\)
=>\(V_{H_2}=n.22,4=0,4.22,4=8,96\left(l\right)\)
b, Từ ptpu ta có: \(n_{ZnCl_2}=y=\dfrac{0,4.1}{1}=0,4\left(mol\right)\)
=>\(m_{ZnCl_2}=n.M=0,4.\left(65+35,5.2\right)=0,4.136=54,4\left(g\right)\)
c, \(m_{H_2}=n.M=0,4.2=0,8\left(g\right)\)
Từ ptpu ta có: \(n_{HCl}=x=\dfrac{0,4.2}{1}=0,8\left(mol\right)\)
=>\(m_{HCl}=n.M=0,8.\left(1+35,5\right)=29,2\left(g\right)\)
Lại có: mchất tham gia = mZn + mHCl = 26+29,2 =55,2(g)
msản phẩm = mH2 + mZnCl2 = 0,8 + 54,4 = 55,2 (g)
=>\(\dfrac{m_{chatthamgia}}{m_{sanpham}}=\dfrac{55,2}{55,2}=1\)