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\(n_{BaCl_2}=\dfrac{41,6}{208}=0,2\left(mol\right)\)
\(n_{AgNO_3}=\dfrac{17}{170}=0,1\left(mol\right)\)
\(BaCl_2+2AgNO_3\rightarrow Ba\left(NO_3\right)_2+2AgCl\)
\(\dfrac{0,2}{1}>\dfrac{0,1}{2}\) ⇒ BaCl2 dư.
a, \(n_{AgCl}=n_{AgNO_3}=0,1\left(mol\right)\)
\(\Rightarrow m_{AgCl}=0,1.143,5=14,35\left(g\right)\)
b, \(n_{Ba\left(NO_3\right)_2}=\dfrac{1}{2}n_{AgNO_3}=0,05\left(mol\right)\)
\(C_{M_{Ba\left(NO_3\right)_2}}=\dfrac{0,05}{0,2}=0,25\left(M\right)\)
\(n_{BaCl_2phan/ung}=\dfrac{1}{2}n_{AgNO_3}=0,05\left(mol\right)\)
\(\Rightarrow n_{BaCl_2dư}=0,15\left(mol\right)\rightarrow C_{M\left(BaCl_2\right)}=\dfrac{0,15}{0,2}=0,75\left(M\right)\)
a) \(n_{Al}=\dfrac{5,4}{27}=0,2\left(mol\right)\); \(n_{H_2SO_4}=0,3.0,1=0,03\left(mol\right)\)
PTHH: 2Al + 3H2SO4 --> Al2(SO4)3 + 3H2
Xét tỉ lệ: \(\dfrac{0,2}{2}>\dfrac{0,03}{3}\) => Al dư, H2SO4 hết
X là Al2(SO4)3; Y là H2; Z là Al(dư)
PTHH: 2Al + 3H2SO4 --> Al2(SO4)3 + 3H2
0,02<----0,03-------->0,01
=> m = 5,4 - 0,02.27 = 4,86 (g)
b)\(C_{M\left(Al_2\left(SO_4\right)_3\right)}=\dfrac{0,01}{0,1}=0,1M\)
a, \(Zn+2HCl\rightarrow ZnCl_2+H_2\)
Ta có: \(n_{Zn}=\dfrac{13}{65}=0,2\left(mol\right)\)
Theo PT: \(n_{ZnCl_2}=n_{H_2}=n_{Zn}=0,2\left(mol\right)\)
\(\Rightarrow V_{H_2}=0,2.24,79=4,958\left(l\right)\)
b, \(n_{HCl}=2n_{Zn}=0,4\left(mol\right)\Rightarrow V_{HCl}=\dfrac{0,4}{2}=0,2\left(l\right)\)
c, \(C_{M_{ZnCl_2}}=\dfrac{0,2}{0,2}=1\left(M\right)\)
a) \(n_{Al}=\dfrac{5,4}{27}=0,2\left(mol\right)\); \(n_{H_2SO_4}=0,3.0,1=0,03\left(mol\right)\)
PTHH: 2Al + 3H2SO4 --> Al2(SO4)3 + 3H2
Xét tỉ lệ: \(\dfrac{0,2}{2}>\dfrac{0,03}{3}\) => Al dư, H2SO4 hết
X là Al2(SO4)3; Y là H2; Z là Al(dư)
PTHH: 2Al + 3H2SO4 --> Al2(SO4)3 + 3H2
0,02<----0,03-------->0,01
=> m = 5,4 - 0,02.27 = 4,86 (g)
b)\(C_{M\left(Al_2\left(SO_4\right)_3\right)}=\dfrac{0,01}{0,1}=0,1M\)
a, \(n_{H_2}=\dfrac{4,48}{22,4}=0,2\left(mol\right)\)
PT: \(2Na+2H_2O\rightarrow2NaOH+H_2\)
Theo PT: \(n_{Na}=2n_{H_2}=0,4\left(mol\right)\Rightarrow m_{Na}=0,4.23=9,2\left(g\right)\)
b, \(n_{NaOH}=2n_{H_2}=0,4\left(mol\right)\)
\(\Rightarrow C_{M_{NaOH}}=\dfrac{0,4}{2}=0,2\left(M\right)\)
a, \(Fe+H_2SO_4\rightarrow FeSO_4+H_2\)
b, \(n_{Fe}=\dfrac{1,12}{56}=0,02\left(mol\right)\)
\(n_{H_2SO_4}=0,2.0,12=0,024\left(mol\right)\)
Xét tỉ lệ: \(\dfrac{0,02}{1}< \dfrac{0,024}{1}\), ta được H2SO4 dư.
Theo PT: \(n_{H_2SO_4\left(pư\right)}=n_{FeSO_4}=n_{Fe}=0,02\left(mol\right)\)
\(\Rightarrow n_{H_2SO_4\left(dư\right)}=0,024-0,02=0,004\left(mol\right)\)
\(\Rightarrow\left\{{}\begin{matrix}C_{M_{FeSO_4}}=\dfrac{0,02}{0,2}=0,1\left(M\right)\\C_{M_{H_2SO_4\left(dư\right)}}=\dfrac{0,004}{0,2}=0,02\left(M\right)\end{matrix}\right.\)
`n_[Fe]=[11,2]/56=0,2(mol)`
`n_[HCl]=0,3.2=0,6(mol)`
`Fe + 2HCl -> FeCl_2 + H_2 \uparrow`
`0,2` `0,4` `0,2` `0,2` `(mol)`
`a)` Ta có:`[0,2]/1 < [0,6]/2`
`=>HCl` dư
`=>V_[H_2]=0,2.22,4=4,48(l)`
`b)HCl` còn dư sau p/ứ
`=>m_[HCl(dư)]=(0,6-0,4).36,5=7,3(g)`
`c)C_[M_[FeCl_2]]=[0,2]/[0,3]~~0,67(M)`
`C_[M_[HCl(dư)]=[0,6-0,4]/[0,3]~~0,67(M)`
\(n_{Fe}=\dfrac{11,2}{56}=0,2\left(mol\right)\)
\(n_{HCl}=0,3.2=0,6\left(mol\right)\)
\(Fe+2HCl\rightarrow FeCl_2+H_2\)
0,2 < 0,6 ( mol )
0,2 0,4 0,2 0,2 ( mol )
\(V_{H_2}=0,2.22,4=4,48\left(l\right)\)
Chất dư là HCl
\(m_{HCl\left(dư\right)}=\left(0,6-0,4\right).36,5=7,3\left(g\right)\)
\(C_{M_{FeCl_2}}=\dfrac{0,2}{0,3}=0,66\left(M\right)\)
\(C_{M_{HCl\left(dư\right)}}=\dfrac{0,2}{0,3}=0,66\left(M\right)\)
nAl =5.4275.427=0.2 (mol) đổi 200ml = 0,2l
nH2SO4 = Cm.V =1,35.0,2=0,27(MOL)
2Al + 3H2SO4→→Al2(SO4)3 + 3H2
pt; 2 ; 3 : 1 : 3
đb; 0.18 : 0.27 : 0.09 : 0.27 (mol)
so sánh nAl =0.220.22>nH2SO4 =0.2730.273
a, nAl dư = 0.2-0.18=0.02(mol)
m Al dư = 0,02.27=0.54(g)
b, VHH22=0,27.22,4 = 6,048(l)
c, dd tạo thành sau pư là Al2(SO4)3
Cm Al2(SO4)3 = nVnV=0.090.20.090.2=0.45
\(n_{Al}=\dfrac{5,4}{27}=0,2\left(mol\right)\\ n_{H_2SO_4}=0,5.0,1=0,05\left(mol\right)\\ pthh:2Al+3H_2SO_4\rightarrow Al_2\left(SO_4\right)_3+3H_2\)
\(LTL:\dfrac{0,2}{2}>\dfrac{0,05}{3}\)
=> Al dư
\(n_{H_2}=n_{H_2SO_4}=0,05\left(mol\right)\)
\(V_{H_2}=0,05.22,4=1,12l\\ C_M=\dfrac{\dfrac{1}{60}}{0,1}=0,16M\)