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\(a.\)
\(GS:\)
\(n_{hh}=1\left(mol\right)\)
\(Đặt:n_{N_2}=a\left(mol\right),n_{CO_2}=b\left(mol\right)\)
\(\Rightarrow a+b=1\left(1\right)\)
\(m_A=28a+44b=18\cdot2=36\left(2\right)\)
\(\left(1\right),\left(2\right):\)
\(a=b=0.5\)
\(\%m_{N_2}=\dfrac{0.5\cdot28}{0.5\cdot28+0.5\cdot44}\cdot100\%=38.89\%\)
\(\%m_{CO_2}=61.11\%\)
\(b.\)
\(\dfrac{n_{N_2}}{n_{CO_2}}=\dfrac{0.5}{0.5}=\dfrac{1}{1}\)
\(n_{N_2}=n_{CO_2}=\dfrac{1}{2}\cdot n_A=\dfrac{0.2}{2}=0.1\left(mol\right)\)
\(Đặt:n_{CO_2}=x\left(mol\right)\)
\(\overline{M}=\dfrac{0.1\cdot28+0.1\cdot44+44x}{0.2+x}=20\cdot2=40\left(\dfrac{g}{mol}\right)\)
\(\Rightarrow x=0.2\)
\(m_{CO_2\left(cầnthêm\right)}=0.2\cdot44=8.8\left(g\right)\)
a) Gọi số mol H2, N2 trong A là a, b
Có \(\dfrac{2a+28b}{a+b}=9,125.2=18,25\)
=> a = 0,6b
\(\left\{{}\begin{matrix}\%V_{H_2}=\dfrac{a}{a+b}.100\%=37,5\%\\\%V_{N_2}=\dfrac{b}{a+b}.100\%=62,5\%\end{matrix}\right.\)
b) \(n_A=\dfrac{14,6}{18,25}=0,8\left(mol\right)\)
c) \(n_A=\dfrac{6,2}{18,25}=\dfrac{124}{365}\left(mol\right)\)
Gọi số mol H2 cần thêm là x
Có \(\dfrac{2x+6,2}{x+\dfrac{124}{365}}=7,5.2=15\)
=> x = 0,085 (mol)
=> mH2 = 0,085.2 = 0,17(g)
\(\left\{{}\begin{matrix}CuO:a\\Fe2O3:2a\end{matrix}\right.\)
a.\(80a+320a=24\Leftrightarrow a=0.06\)
\(\Rightarrow\left\{{}\begin{matrix}CuO=0.06\\Fe2O3=0.12\end{matrix}\right.\Leftrightarrow\left\{{}\begin{matrix}CuO=4.8g\\Fe2O3=19.2g\end{matrix}\right.\)
b.\(CuO+H2\rightarrow Cu+H2O\)
a a a
\(Fe2O3+3H2\rightarrow2Fe+3H2O\)
2a 6a 4a
\(\Rightarrow V_{H2}=\left(a+6a\right)\times22.4=9.408l\)
c.nHCl = 0.2 mol
\(Fe+2HCl\rightarrow FeCl2+H2\)
0.1 0.2
m chất rắn còn lại = mCu + m Fe ban đầu - m Fe bị hòa tan
= \(a\times64+4a\times56-0.1\times56=11.68g\)
a) Mhh = 13,25.2 = 26,5 (g/mol
Áp dụng sơ đồ đường chéo:
\(\dfrac{V_{CH_4}}{V_{C_2H_6}}=\dfrac{30-26,5}{26,5-16}=\dfrac{1}{3}\\ \rightarrow\left\{{}\begin{matrix}\%V_{CH_4}=\dfrac{1}{1+3}.100\%=25\%\\\%V_{C_2H_6}=100\%-25\%=75\%\end{matrix}\right.\)
b) \(\%H=\dfrac{4+3.6}{16+3.30}.100\%=20,75\%\)
bài1
ta có dA/H2=22 →MA=22MH2=22 \(\times\) 2 =44
nA=\(\frac{5,6}{22,4}\)=0,25
\(\Rightarrow\)mA=M\(\times\)n=11 g
MA=dA/\(H_2\)×M\(H_2\)=22×(1×2)=44g/mol
nA=VA÷22,4=5,6÷22,4=0,25mol
mA=nA×MA=0,25×44=11g
a) PTHH: \(2CO+O_2\underrightarrow{t^o}2CO_2\) (1)
\(4H_2+O_2\underrightarrow{t^o}2H_2O\) (2)
b) Ta có: \(\left\{{}\begin{matrix}\Sigma n_{O_2}=\dfrac{9,6}{32}=0,3\left(mol\right)\\n_{CO_2}=\dfrac{8,8}{44}=0,2\left(mol\right)\end{matrix}\right.\) \(\Rightarrow\left\{{}\begin{matrix}n_{O_2\left(1\right)}=0,1mol\\n_{O_2\left(2\right)}=0,2mol\end{matrix}\right.\)
\(\Rightarrow\left\{{}\begin{matrix}m_{CO}=0,1\cdot28=2,8\left(g\right)\\m_{H_2}=0,2\cdot2=0,4\left(g\right)\end{matrix}\right.\) \(\Rightarrow\left\{{}\begin{matrix}\%m_{CO}=\dfrac{2,8}{2,8+0,4}\cdot100\%=87,5\%\\\%m_{H_2}=12,5\%\end{matrix}\right.\)
c) PTHH: \(2KMnO_4\underrightarrow{t^o}K_2MnO_4+MnO_2+O_2\uparrow\)
Theo PTHH: \(n_{KMnO_4}=2n_{O_2}=0,6mol\)
\(\Rightarrow m_{KMnO_4}=0,6\cdot158=94,8\left(g\right)\)
Bài 1: a)
nH = \(\frac{3,36}{22,4}\)= 0.15 mol
PTHH: Fe + 2HCL --> FeCl2 + H2
Pt: 1 --> 2 -------> 1 ------> 1 (mol)
PƯ: 0.15 <- 0,3 <-- 0, 15 <--- 0,15 (mol)
mHCL = n . M = 0,3 . (1 + 35,5) = 10,95 g
b) mFeCL2 = 0,15 . (56 + 2 . 35,5) = 19,05 g
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