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a) `n_{H_2} = (3,36)/(22,4) = 0,15 (mol)`
PTHH: `Fe + 2HCl -> FeCl_2 + H_2`
Theo PT: `n_{Fe} = n_{H_2} = 0,15 (mol)`
`=> m_{Fe} = 0,15.56 = 8,4 (g)`
b) Theo PT: `n_{HCl} = 2n_{H_2} = 0,3 (mol)`
`=> m_{ddHCl} = (0,3.36,5)/(16\%) = 68,4375 (g)`
`n_[Na_2 CO_3]=[2,76]/106=0,03(mol)`
`Na_2 CO_3 +2CH_3 COOH->2CH_3 COONa+H_2 O+CO_2\uparrow`
`0,03` `0,06` `0,03` `(mol)`
`CO_2 +Ca(OH)_2 ->CaCO_3 \downarrow+H_2 O`
`0,03` `0,03`
`a)CH_3 COONa` là muối natri axetat.
`V_[dd CH_3 COOH]=[0,06]/[0,2]=0,3(l)`
`b)m_[CaCO_3]=0,03.100=3(g)`
a, CH3COONa: Natri axetat
PT: \(Na_2CO_3+2CH_3COOH\rightarrow2CH_3COONa+CO_2+H_2O\)
Ta có: \(n_{Na_2CO_3}=\dfrac{2,76}{106}=0,026\left(mol\right)\)
Theo PT: \(n_{CH_3COOH}=2n_{Na_2CO_3}=0,052\left(mol\right)\Rightarrow V_{CH_3COOH}=\dfrac{0,052}{0,2}=0,26\left(l\right)\)
b, \(CO_2+Ca\left(OH\right)_2\rightarrow CaCO_{3\downarrow}+H_2O\)
Theo PT: \(n_{CaCO_3}=n_{CO_2}=n_{Na_2CO_3}=0,026\left(mol\right)\)
\(\Rightarrow m_{CaCO_3}=0,026.100=2,6\left(g\right)\)
\(n_{H_2}=\dfrac{3,36}{22,4}=0,15\left(mol\right)\)
a)PTHH: \(Mg+2HCl\rightarrow MgCl_2+H_2\)
b) \(n_{Mg}=n_{H_2}=0,15\left(mol\right)\)
\(m_{Mg}=0,15.24=3,6\left(g\right)\)
c) \(n_{HCl}=2n_{H_2}=0,3\left(mol\right)\)
\(C_{M_{HCl}}=\dfrac{0,3}{0,5}=0,6\left(M\right)\)
a, \(Zn+2HCl\rightarrow ZnCl_2+H_2\)
b, \(n_{H_2}=\dfrac{6,72}{22,4}=0,3\left(mol\right)\)
Theo PT: \(n_{Zn}=n_{H_2}=0,3\left(mol\right)\)
\(\Rightarrow m_{Zn}=0,3.65=19,5\left(g\right)\)
c, \(n_{HCl}=2n_{H_2}=0,6\left(mol\right)\)
\(\Rightarrow C_{M_{HCl}}=\dfrac{0,6}{0,1}=6\left(M\right)\)
\(n_{HCl}=0,3.2=0,6\left(mol\right)\)
PT: \(2Al+6HCl\rightarrow2AlCl_3+3H_2\)
a, \(n_{Al}=\dfrac{1}{3}n_{HCl}=0,2\left(mol\right)\)
\(\Rightarrow m_{Al}=0,2.27=5,4\left(g\right)\)
b, \(n_{H_2}=\dfrac{1}{2}n_{HCl}=0,3\left(mol\right)\)
\(\Rightarrow V_{H_2}=0,3.22,4=6,72\left(l\right)\)
\(a.Fe+2HCl\rightarrow FeCl_2+H_2\uparrow\)
b. số mol của 16,8 gam Fe:
\(n_{Fe}=\dfrac{m}{M}=\dfrac{16,8}{56}=0,3\left(mol\right)\)
Khối lượng của HCl:
\(m_{HCl}=n.M=0,6.36,5=21,9\left(g\right)\)
c.Thể tích khí Hiđro (đktc):
\(V_{H_2}=n.22,4=0,3.22,4=6,72\left(l\right)\)
