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\(a.\)
\(n_{hh}=0.2+0.15+0.1=0.45\left(mol\right)\)
\(V_X=0.45\cdot22.4=10.08\left(l\right)\)
\(b.\)
\(m_X=0.2\cdot28+0.15\cdot71+0.1\cdot32=19.45\left(g\right)\)
\(c.\)
\(\overline{M}_X=\dfrac{19.45}{0.45}=43.22\left(g\text{/}mol\right)\)
\(d.\)
\(d_{X\text{/}kk}=\dfrac{43.22}{29}=1.4\)
Nặng hơn không khí 1.4 lần
a) Gọi \(\left\{{}\begin{matrix}n_{O_2}=a\left(mol\right)\\n_{SO_2}=b\left(mol\right)\end{matrix}\right.\)
=> \(\left\{{}\begin{matrix}a+b=\dfrac{17,92}{22,4}=0,8\\32a+64b=32\end{matrix}\right.\)
=> \(\left\{{}\begin{matrix}a=0,6\left(mol\right)\\b=0,2\left(mol\right)\end{matrix}\right.\)
b) \(\left\{{}\begin{matrix}\%V_{O_2}=\dfrac{0,6}{0,8}.100\%=75\%\\\%V_{SO_2}=\dfrac{0,2}{0,8}.100\%=25\%\end{matrix}\right.\)
c) \(\overline{M}_X=\dfrac{32}{0,8}=40\left(g/mol\right)\)
Xét \(d_{X/kk}=\dfrac{40}{29}=1,379\)
=> X nặng hơn không khí 1,379 lần
d) Gọi số mol N2 thêm vào là x (mol)
\(\overline{M}_Y=\dfrac{32+28x}{0,8+x}=18,8.2=37,6\left(g/mol\right)\)
=> x = 0,2 (mol)
=> \(m_{N_2}=0,2.28=5,6\left(g\right)\)
Câu 1: \(m_{hh}=0,2\cdot27+0,4\cdot39=21\left(g\right)\)
Câu 2: \(V_{khí}=\left(0,1+0,15\right)\cdot22,4=5,6\left(l\right)\)
Câu 3: \(n_{NO_2}=\dfrac{6,9}{46}=0,15\left(mol\right)\) \(\Rightarrow V_{khí}=\left(0,15+0,15\right)\cdot22,4=6,72\left(l\right)\)
Câu 4:
Ta có: \(\left\{{}\begin{matrix}n_{CO_2}=\dfrac{0,672}{22,4}=0,03\left(mol\right)\\n_{H_2}=\dfrac{8,96}{22,4}=0,4\left(mol\right)\end{matrix}\right.\) \(\Rightarrow m_{hh}=0,03\cdot44+0,4\cdot2=2,12\left(l\right)\)
\(n_{O_2}=2a\left(mol\right),n_{N_2}=3a\left(mol\right),n_{SO_2}=4a\left(mol\right)\)
\(n_{hh}=2a+3a+4a=9a\left(mol\right)\)
\(\Rightarrow9a=\dfrac{5.4\cdot10^{23}}{6\cdot10^{23}}=0.9\)
\(\Rightarrow a=9\)
\(V_{hh}=0.9\cdot22.4=20.16\left(l\right)\)
\(m_{hh}=0.2\cdot32+0.3\cdot28+0.4\cdot64=40.4\left(g\right)\)