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a) \(CO_2+2NaOH\rightarrow Na_2CO_3+H_2O\)
b) \(n_{CO_2}=\dfrac{1,12}{22,4}=0,05\left(mol\right)\)
Theo PT: \(n_{NaOH}=2n_{CO_2}=0,1\left(mol\right)\)
=> \(CM_{NaOH}=\dfrac{0,1}{0,1}=1M\)
c) Sửa đề DNaOH = 1,2g/ml
\(m_{ddsaupu}=0,05.44+100.1,2=122,2\left(g\right)\)
\(n_{Na_2CO_3}=n_{CO_2}=0,05\left(mol\right)\)
=> \(C\%_{Na_2CO_3}=\dfrac{0,05.106}{122,2}.100=4,34\%\)
PT: \(CO_2+2NaOH\rightarrow Na_2CO_3+H_2O\)
Ta có: \(n_{CO_2}=\dfrac{1,2395}{24,79}=0,05\left(mol\right)\)
a, Theo PT: \(n_{Na_2CO_3}=n_{CO_2}=0,05\left(mol\right)\Rightarrow m_{Na_2CO_3}=0,05.106=5,3\left(g\right)\)
b, \(n_{NaOH}=2n_{CO_2}=0,1\left(mol\right)\)
\(\Rightarrow C_{M_{NaOH}}=\dfrac{0,1}{0,1}=1\left(M\right)\)
\(n_{Na_2SO_3}=\dfrac{12,6}{126}=0,1mol\)
\(Na_2SO_3+H_2SO_4\rightarrow Na_2SO_4+SO_2+H_2O\)
a) \(n_{SO_2}=n_{Na_2SO_3}=0,1mol\) \(\Rightarrow V=2,24l\)
b) \(n_{H_2SO_4}=n_{Na_2SO_3}=0,1mol\) \(\Rightarrow C_M=\dfrac{0,1}{0,2}=0,5M\)
c) \(m_{Na_2SO_4}=0,1\cdot142=14,2g\)
a/ Fe + 2HCl \(\rightarrow\) FeCl2 + H2
nH2 = \(\dfrac{3,36}{22,4}=0,15\left(mol\right)\)
Theo PTHH: nH2 = nFe = 0,15 (mol) \(\Rightarrow m_{Fe}=0,15.56=8,4\left(g\right)\)
\(\Rightarrow m_{Cu}=11-8,4=2,6\left(g\right)\)
\(\Rightarrow\%m_{Fe}=\dfrac{8,4}{11}.100\%\approx76,4\%\)
\(\Rightarrow\%m_{Cu}=100-76,4\approx23,6\%\)
b/ Theo PTHH ta có: nHCl = 2nFe = 2.0,15 = 0,3 (mol)
\(\Rightarrow V_{ddHCl}=\dfrac{0,3}{2}=0,15\left(M\right)\)
c/ mHCl = 36,5 . 0,3 = 10,95(g)
\(\Rightarrow C\%_{HCl}=\dfrac{m_{HCl}}{m_{ddHCl}}.100\%=\dfrac{10,95}{200}.100\%=5,475\%\)
a, PT: \(Fe+2HCl\rightarrow FeCl_2+H_2\)
Ta có: \(n_{H_2}=\dfrac{3,36}{22,4}=0,15\left(mol\right)\)
Theo PT: \(n_{Fe}=n_{H_2}=0,15\left(mol\right)\)
\(\Rightarrow\left\{{}\begin{matrix}\%m_{Fe}=\dfrac{0,15.56}{11}.100\%\approx76,36\%\\\%m_{Cu}\approx23,64\%\end{matrix}\right.\)
b, Theo PT: \(n_{HCl}=2n_{H_2}=0,3\left(mol\right)\)
\(\Rightarrow V_{ddHCl}=\dfrac{0,3}{2}=0,15\left(l\right)\)
c, \(C\%_{HCl}=\dfrac{0,3.36,5}{200}.100\%=5,475\%\)
n NaOH = 2 n CO 2 = 1,12x2 /22,4 = 0,1 (mol)
Nồng độ mol của dung dịch NaOH là 1M.
\(n_{CO_2}=\dfrac{1,12}{22,4}=0,05\left(mol\right)\\a, CO_2+2NaOH\rightarrow Na_2CO_3+H_2O\\ n_{NaOH}=2.0,05=0,1\left(mol\right)\\ b,C_{MddNaOH}=\dfrac{0,1}{0,1}=1\left(M\right)\\ c,n_{Na_2CO_3}=n_{CO_2}=0,05\left(mol\right)\\ m_{muối}=m_{Na_2CO_3}=0,05.106=5,3\left(g\right)\)
Ta có: \(n_{NaOH}=0,1.0,5=0,05\left(mol\right)\)
PT: \(CH_3COOH+NaOH\rightarrow CH_3COONa+H_2O\)
Theo PT: \(n_{CH_3COOH}=n_{CH_3COONa}=n_{NaOH}=0,05\left(mol\right)\)
a, \(C_{M_{CH_3COOH}}=\dfrac{0,05}{0,2}=0,25\left(M\right)\)
b, \(m_{CH_3COONa}=0,05.82=4,1\left(g\right)\)
a)
Gọi $n_{Na_2CO_3} = a(mol) \to n_{NaHCO_3} = 1,4a(mol)$
$2NaOH + CO_2 \to Na_2CO_3 + H_2O$
$NaOH + CO_2 \to NaHCO_3$
Theo PTHH :
$n_{NaOH} = 2a + 1,4a = 3,4.0,5(mol)$
$\Rightarrow a = 0,5$
$C + O_2 \xrightarrow{t^o} CO_2$
$n_C = n_{CO_2} = n_{Na_2CO_3} + n_{NaHCO_3} = 0,5 + 0,7 = 1,2(mol)$
$m_C = 1,2.12 = 14,4(gam)$
b)
$CaCl_2 + Na_2CO_3 \to CaCO_3 + H_2O$
n CaCl2 = n CaCO3 = n Na2CO3 = 0,5(mol)
=> V dd CaCl2 = 0,5/1 = 0,5(lít)
m CaCO3 = 0,5.100 = 50(gam)
c)
$NaHCO_3 + Ca(OH)_2 \to CaCO_3 + NaOH + H_2O$
$Na_2CO_3 + Ca(OH)_2 \to CaCO_3 + 2NaOH$
Ta có :
$n_{CaCO_3} = n_{NaHCO_3} + n_{Na_2CO_3} = 1,2(mol)$
$m_{CaCO_3} = 1,2.100 = 120(gam)$
PTHH: \(2NaOH+CO_2\rightarrow Na_2CO_3+H_2O\)
a) \(n_{CO_2}=\dfrac{V}{22,4}=\dfrac{3,36}{22,3}=0,15\left(mol\right)\)
\(\Rightarrow n_{NaOH}=2n_{CO_2}=0,3\left(mol\right)\)
\(C_{M_{ddNaOH}}=\dfrac{n}{V}=\dfrac{0,3}{0,3}=1M\)
b) \(n_{Na_2CO_3}=n_{CO_2}=0,15\left(mol\right)\)
\(m_{Na_2CO_3}=n.M=0,15.106=15,9\left(g\right)\)