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400ml = 0,4l
\(n_{NaOH}=2.0,4=0,8\left(mol\right)\)
a) Pt : \(SO_2+2NaOH\rightarrow Na_2SO_3+H_2O|\)
1 2 1 1
0,4 0,8 0,4
b) \(n_{SO2}=\dfrac{0,8.1}{2}=0,4\left(mol\right)\)
\(V_{SO2\left(dktc\right)}=0,4.22,4=8,96\left(l\right)\)
c) \(n_{Na2SO3}=\dfrac{0,8.1}{2}=0,4\left(mol\right)\)
⇒ \(m_{Na2SO3}=0,4.126=50,4\left(g\right)\)
c) \(C_{M_{Na2SO3}}=\dfrac{0,4}{0,4}=1\left(M\right)\)
Chúc bạn học tốt
a)
PTHH : \(SO_2+Ca\left(OH\right)_2\rightarrow CáO_4+H_2O\)
b)
Ta có :
\(n_{SO_2}=\frac{0,224}{22,4}=0,01\left(mol\right)\)
\(n_{Ca\left(OH\right)_2}=0,01\times1,4=0,014\)
Theo ptpư : \(n_{SO_2}=n_{Ca\left(OH\right)_2}=n_{CaSO_3}=n_{H_2O}\)
Vậy nCa(OH)2 ( dư ) = \(n_{Ca\left(OH\right)_2\left(bđ\right)}-n_{Ca\left(OH\right)_2\left(pư\right)}\)
\(=0,014-0,001=0,004\left(mol\right)\)
PTHH: \(SO_2+2NaOH\rightarrow Na_2SO_3+H_2O\)
Ta có: \(n_{NaOH}=0,4\cdot2=0,8\left(mol\right)\)
\(\Rightarrow n_{SO_2}=0,4\left(mol\right)=n_{Na_2SO_3}\) \(\Rightarrow\left\{{}\begin{matrix}V_{SO_2}=0,4\cdot22,4=8,96\left(l\right)\\m_{Na_2SO_3}=0,4\cdot126=50,4\left(g\right)\\C_{M_{Na_2SO_3}}=\dfrac{0,4}{0,4}=1\left(M\right)\end{matrix}\right.\)
2.
a, \(n_{HCl}=0,2.3,5=0,7\left(mol\right)\)
PTHH: CuO + 2HCl → CuCl2 + H2O
Mol: x 2x
PTHH: Fe2O3 + 6HCl → 2FeCl3 + 3H2O
Mol: y 6y
Ta có: \(\left\{{}\begin{matrix}80x+160y=20\\2x+6y=0,7\end{matrix}\right.\Leftrightarrow\left\{{}\begin{matrix}x=0,05\\y=0,1\end{matrix}\right.\)
b, \(m_{CuO}=0,05.80=4\left(g\right);m_{Fe_2O_3}=20-4=16\left(g\right)\)
c,
PTHH: CuO + 2HCl → CuCl2 + H2O
Mol: 0,05 0,05
PTHH: Fe2O3 + 6HCl → 2FeCl3 + 3H2O
Mol: 0,1 0,2
\(m_{CuCl_2}=0,05.135=6,75\left(g\right)\)
\(m_{FeCl_3}=0,1.162,5=16,25\left(g\right)\)
1.
a, \(n_{CO_2}=\dfrac{2,24}{22,4}=0,1\left(mol\right)\)
PTHH: CO2 + Ba(OH)2 → BaCO3 + H2O
Mol: 0,1 0,1 0,1
b, \(C_{M_{ddBa\left(OH\right)_2}}=\dfrac{0,1}{0,2}=0,5M\)
c, \(m_{BaCO_3}=0,1.197=19,7\left(g\right)\)
$n_{SO_2} = \dfrac{2,24}{22,4} = 0,1(mol0$
$SO_2 + Ca(OH)_2 \to CaSO_3 + H_2O$
$n_{Ca(OH)_2} = n_{SO_2} = 0,1(mol)$
$C_{M_{Ca(OH)_2}} = \dfrac{0,1}{0,2} = 0,5M$
$n_{CaSO_3} = 0,1.120 = 12(gam)$
\(n_{SO_2}=\dfrac{2,24}{22,4}=0,1\left(mol\right)\\ a,SO_2+Ca\left(OH\right)_2\rightarrow CaSO_3\downarrow+H_2O\\ n_{Ca\left(OH\right)_2}=n_{SO_2}=n_{CaSO_3}=0,1\left(mol\right)\\b, C_{MddCa\left(OH\right)_2}=\dfrac{0,1}{0,2}=0,5\left(M\right)\\ c,m_{CaSO_3}=120.0,1=12\left(g\right)\)