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a. Zn (0,1 mol) + 2HCl \(\rightarrow\) ZnCl2 (0,1 mol) + H2 (0,1 mol).
Khối lượng kẽm clorua thu được là 0,1.136=13,6 (g).
b. Thể tích khí hiđro sinh ra ở đktc là 0,1.22,4=2,24 (lít).
\(n_{Zn}=\dfrac{6,5}{65}=0,1mol\)
\(Zn+2HCl\rightarrow ZnCl_2+H_2\)
0,1 0,2 0,1 ( mol )
\(m_{HCl}=0,2.36,5=7,3g\)
\(V_{H_2}=0,1.22,4=2,24l\)
Bài 1:
nZn = \(\dfrac{6,5}{65}=0,1\left(mol\right)\)
Pt: Zn + 2HCl --> ZnCl2 + H2
0,1 mol-> 0,2 mol---------> 0,1 mol
VH2 sinh ra = 0,1 . 22,4 = 2,24 (lít)
C% dd HCl = \(\dfrac{0,2\times36,5}{100}.100\%=7,3\%\)
Bài 2:
nS = \(\dfrac{6,4}{32}=0,2\left(mol\right)\)
Pt: 2KClO3 --to--> 2KCl + 3O2
\(\dfrac{0,4}{3}\) mol<-------------------0,2 mol
......S + ....O2 --to--> SO2
0,2 mol-> 0,2 mol
mKClO3 cần = \(\dfrac{0,4}{3}.122,5=16,33\left(g\right)\)
\(n_{Zn}=\dfrac{13}{65}=0,2\left(mol\right)\)
PTHH: Zn + H2SO4 ---> ZnSO4 + H2
0,2--->0,2--------->0,2------>0,2
\(V_{H_2}=0,2.22,4=4,48\left(l\right)\\ m_{H_2SO_4}=\dfrac{0,2.98}{20\%}=98\left(g\right)\\ \rightarrow V_{ddH_2SO_4}=\dfrac{98}{1,14}=86\left(ml\right)=0,086\left(l\right)\\ \rightarrow C_{M\left(H_2SO_4\right)}=\dfrac{0,2}{0,086}=2,33M\)
\(n_{Zn}=\dfrac{19,5}{65}=0,3\left(mol\right)\)
PTHH :
\(Zn+2HCl\rightarrow ZnCl_2+H_2\uparrow\)
0,3 0,6 0,3 0,3
\(a,V_{H_2}=0,3.22,4=6,72\left(l\right)\)
\(b,C_{M_{HCl}}=\dfrac{n}{V}=\dfrac{0,6}{0,5}=1,2M\)
\(c,m_{ZnCl_2}=0,3.136=40,8\left(g\right)\)
Tên gọi : Kẽm Clorua
`a)PTHH:`
`Zn + 2HCl -> ZnCl_2 + H_2`
`0,02` `0,02` `0,02` `(mol)`
`n_[Zn]=[1,3]/65=0,02(mol)`
`b)V_[H_2]=0,02.22,4=0,448(l)`
`c)C%_[ZnCl_2]=[0,02.136]/[1,3+50-0,02.2].100~~5,31%`
\(n_{Zn}=\dfrac{1,3}{65}=0,02\left(mol\right)\)
\(Zn+2HCl\rightarrow ZnCl_2+H_2\)
0,02 0,04 0,02 0,02 ( mol )
\(V_{H_2}=0,02.22,4=0,448\left(l\right)\)
\(C\%_{ZnCl_2}=\dfrac{0,02.136}{1,3+50-0,02.2}.100=5,3\%\)
\(n_{Zn}=\dfrac{19,5}{65}=0,3\left(mol\right)\)
\(m_{HCl}=\dfrac{150.18,25}{100}=27,375\left(g\right)\)
\(n_{HCl}=\dfrac{27,375}{36,5}=0,75\left(mol\right)\)
PTHH :
\(Zn+2HCl\rightarrow ZnCl_2+H_2\uparrow\)
trc p/u : 0,3 0,75
p/u: 0,3 0,6 0,3 0,3
sau p/u : 0 0,15 0,3 0,3
---> Sau p/ư HCl dư
\(a,V_{H_2}=0,3.22,4=6,72\left(l\right)\)
\(b,m_{ddHCl}=0,6.36,5=21,9\left(g\right)\)
\(c,m_{ZnCl_2}=0,3.136=40,8\left(g\right)\)
\(m_{ddZnCl_2}=19,5+150-\left(0,3.2\right)=168,9\left(g\right)\)
\(C\%=\dfrac{40,8}{168,9}.100\%\approx24,16\%\)
a) \(n_{Al}=\dfrac{5,4}{27}=0,2\left(mol\right)\)
PTHH: 2Al + 6HCl --> 2AlCl3 + 3H2
______0,2-->0,6--------------->0,3
=> mHCl = 0,6.36,5 = 21,9 (g)
b) VH2 = 0,3.22,4 = 6,72 (l)
a) nAl=5,427=0,2(mol)���=5,427=0,2(���)
PTHH: 2Al + 6HCl --> 2AlCl3 + 3H2
______0,2-->0,6--------------->0,3
=> mHCl = 0,6.36,5 = 21,9 (g)
b) VH2 = 0,3.22,4 = 6,72 (l)
\(n_{Zn}=\dfrac{8,125}{65}=0,125\left(mol\right)\\ pthh:Zn+2HCl\rightarrow ZnCl_2+H_2\uparrow\)
0,125 0,125 0,125
\(V_{H_2}=0,125.224=2,8\left(l\right)\\ m_{\text{dd}}=8,125+50-0,125.2=57,875\left(g\right)\\ C\%_{ZnCl_2}=\dfrac{0,125.136}{57,875}.100\%=29,374\%\)