Biết rằng 3,36 lít khí CO2 ở đktc tác dụng vừa đủ với 300ml dd NaOH tạo ra muối
trung hoà.
a. Tính nồng độ mol của dd NaOH đã tham gia phản ứng.
b. Tính khối lượng muối tạo ra.
Hãy nhập câu hỏi của bạn vào đây, nếu là tài khoản VIP, bạn sẽ được ưu tiên trả lời.
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) \(n_{Na_2CO_3}=n_{CO_2}=0,15\left(mol\right)\)
\(m_{Na_2CO_3}=n.M=0,15.106=15,9\left(g\right)\)