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a) Zn + 2HCl --> ZnCl2 + H2
b) \(n_{Zn}=\dfrac{13}{65}=0,2\left(mol\right)\)
PTHH: Zn + 2HCl --> ZnCl2 + H2
0,2-------------->0,2--->0,2
=> \(m_{ZnCl_2}=0,2.136=27,2\left(g\right)\)
c)
Lượng khí thu được bị thất thoát 20%
=> Lượng khí thu được chiếm 80% lượng khí sinh ra
=> \(V_{H_2}=0,2.22,4.80\%=3,584\left(l\right)\)
\(n_{HCl}=0,3.2=0,6\left(mol\right)\\a, 2Al+6HCl\rightarrow2AlCl_3+3H_2\\ b,n_{H_2}=\dfrac{3}{6}.0,6=0,3\left(mol\right)\\ V_{H_2\left(đktc\right)}=0,3.22,4=6,72\left(l\right)\\ c,n_{Al}=n_{AlCl_3}=\dfrac{2}{6}.0,6=0,2\left(mol\right)\\ m_{Al}=0,2.27=5,4\left(g\right)\\ d,V_{ddAlCl_3}=V_{ddHCl}=0,3\left(l\right)\\ C_{MddHCl}=\dfrac{0,2}{0,3}=\dfrac{2}{3}\left(M\right)\)
\(n_{Mg}=\dfrac{12}{24}=0,5\left(mol\right)\\
pthh:Mg+H_2SO_4\rightarrow MgSO_4+H_2\)
0,5 0,5 0,5
\(m_{MgSO_4}=0,5.120=60g\\
V_{H_2}=0,5.22,4=11,2\left(mol\right)\\
\)
c)
\(n_{H_2SO_4}=\dfrac{19,6}{98}=0,2\left(mol\right)\\
pthh:Zn+H_2SO_4\rightarrow ZnSO_4+H_2\\
LTL:0,5>0,2\)
=> H2SO4 dư
\(n_{Zn\left(p\text{ư}\right)}=n_{H_2SO_4}=0,2\left(mol\right)\\
n_{Zn\left(d\right)}=0,5-0,2=0,3\left(mol\right)\)
\(1,PTHH:2Na+2H_2O\xrightarrow[]{}2NaOH+H_2\\2, n_{Na}=\dfrac{4,6}{23}=0,2\left(mol\right)\\ PTHH:2Na+2H_2O\xrightarrow[]{}2NaOH+H_2\\ \Rightarrow n_{H_2}=\dfrac{0,2}{2}=0,1\left(mol\right)\\ V_{H_2}=0,1.22,4=2,24\left(l\right)\\ 3.n_{NaOH}=n_{Na}=0,2\left(mol\right)\\ m_{NaOH}=0,2.40=8\left(g\right)\)
a, PT: \(Fe+2HCl\rightarrow FeCl_2+H_2\)
b, Ta có: \(n_{Fe}=\dfrac{11,2}{56}=0,2\left(mol\right)\)
Theo PT: \(n_{H_2}=n_{Fe}=0,2\left(mol\right)\Rightarrow V_{H_2}=0,2.22,4=4,48\left(l\right)\)
c, Theo PT: \(n_{HCl}=2n_{Fe}=0,4\left(mol\right)\)
\(\Rightarrow m_{HCl}=0,4.36,5=14,6\left(g\right)\)
\(Fe+2HCl\rightarrow FeCl_2+H_2\)
\(1mol\) \(2mol\) \(1mol\)
\(0,2mol\) \(0,4mol\) \(0,2mol\)
\(n_{Fe}=\dfrac{m}{M}=\dfrac{11,2}{56}=0,2\left(mol\right)\)
\(V_{H_2}=n.22,4=0,2.22,4=4,48\left(l\right)\)
\(m_{HCl}=n.M=0,4.=14,6\left(g\right)\)
nZn= 13/65=0,2(mol)
a) PTHH: Zn + 2 HCl -> ZnCl2 + H2
b) nH2=nZnCl2=nZn=0,2(mol)
=>V(H2,đktc)=0,2 x 22,4= 4,48(l)
c) khối lượng muối sau phản ứng chứ nhỉ?
mZnCl2=136.0,2=27,2(g)
pthh 2Na + 2H2O ---> 2NaOH + H2
nNaOH = 16 : 40 = 0,4 (mol)
theo pthh , nNa = nNaOH = 0,4(mol)
=> mNa = 0,4 . 23 = 9,2 (g)
theo pthh , nH2 = 1/2 nNa = 0,2 (mol)
=> VH2 = 0,2 . 22,4 = 4,48 (l)
\(a)Mg+2HCl\rightarrow MgCl_2+H_2\)
\(b)n_{Mg}=\dfrac{3}{24}=0,125mol\\ n_{HCl}=0,1.1=0,1mol\\ \Rightarrow\dfrac{0,125}{1}>\dfrac{0,1}{2}\Rightarrow Mg.dư\\ n_{H_2}=n_{MgCl_2}=\dfrac{0,1}{2}=0,05mol\\ V_{H_2}=0,05.24,79=1,2395l\\ c)C_{M_{MgCl_2}}=\dfrac{0,05}{0,1}=0,5M\)
Đoạn xét tỉ lệ phải là \(\dfrac{0,125}{1}>\dfrac{0,1}{2}\) em nhé.
\(n_{Al}=\dfrac{2,5}{27}=\dfrac{25}{270}=\dfrac{5}{54}\left(mol\right)\\ n_{H_2SO_4}=0,5\left(mol\right)\\ a,2Al+3H_2SO_4\rightarrow Al_2\left(SO_4\right)_3+3H_2\\ b,Vì:\dfrac{\dfrac{5}{54}}{2}< \dfrac{0,5}{4}\Rightarrow H_2SO_4dư\\ b,n_{H_2SO_4\left(dư\right)}=0,5-\dfrac{3}{2}.\dfrac{5}{54}=\dfrac{13}{36}\left(mol\right)\\ \Rightarrow m_{H_2SO_4}=\dfrac{13}{36}.98=\dfrac{637}{18}\left(g\right)\\ c,n_{H_2}=\dfrac{3}{2}.n_{Al}=\dfrac{3}{2}.\dfrac{5}{54}=\dfrac{5}{36}\left(mol\right)\\ \Rightarrow V_{H_2\left(đktc\right)}=\dfrac{5}{36}.22,4=\dfrac{28}{9}\left(l\right)\)
\(n_{Na}=\dfrac{9,2}{23}=0,4\left(mol\right)\\ a,2Na+2H_2O\rightarrow2NaOH+H_2\uparrow\\ b,n_{H_2}=\dfrac{0,4}{2}=0,2\left(mol\right)\\ V_{H_2\left(đktc\right)}=0,2.22,4=4,48\left(l\right)\\ c,n_{NaOH}=n_{Na}=0,4\left(mol\right)\\ m_{NaOH}=0,4.40=16\left(g\right)\)
a) 2Na + 2H2O --> 2NaOH + H2
b) \(n_{Na}=\dfrac{9,2}{23}=0,4\left(mol\right)\)
PTHH: 2Na + 2H2O --> 2NaOH + H2
0,4--------------->0,4---->0,2
=> \(V_{H_2}=0,2.22,4=4,48\left(l\right)\)
c) \(m_{NaOH}=0,4.40=16\left(g\right)\)