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a, \(\overline{M}=\dfrac{0,1.44+0,2.28}{0,1+0,2}\approx33,33\left(g/mol\right)\)
b, \(\overline{M}=\dfrac{0,2.28+0,3.2}{0,2+0,3}=12,4\left(g/mol\right)\)
c, \(\overline{M}=\dfrac{0,1.28+0,2.30+0,2.44}{0,1+0,2+0,2}=35,2\left(g/mol\right)\)
d, \(\overline{M}=\dfrac{0,2.56+0,1.24+0,1.27}{0,2+0,1+0,1}=40,75\left(g/mol\right)\)
\(a.\)
\(n_{hh}=0.2+0.15+0.1=0.45\left(mol\right)\)
\(V_X=0.45\cdot22.4=10.08\left(l\right)\)
\(b.\)
\(m_X=0.2\cdot28+0.15\cdot71+0.1\cdot32=19.45\left(g\right)\)
\(c.\)
\(\overline{M}_X=\dfrac{19.45}{0.45}=43.22\left(g\text{/}mol\right)\)
\(d.\)
\(d_{X\text{/}kk}=\dfrac{43.22}{29}=1.4\)
Nặng hơn không khí 1.4 lần
Mình làm mẫu một ý nha:
a, Gọi hh SO2 và H2 là X; O2 và N2 là Y
\(\Rightarrow\left\{{}\begin{matrix}\left\{{}\begin{matrix}m_X=0,02.64+0,5.2=2,28\left(g\right)\\n_X=0,02+0,5=0,52\left(mol\right)\end{matrix}\right.\\\left\{{}\begin{matrix}m_Y=0,2.32+0,5.28=20,4\left(g\right)\\n_Y=0,2+0,5=0,7\left(mol\right)\end{matrix}\right.\end{matrix}\right.\)
\(\Rightarrow\left\{{}\begin{matrix}M_X=\dfrac{2,28}{0,52}=4,4\left(\dfrac{g}{mol}\right)\\M_Y=\dfrac{20,4}{0,7}=29,1\left(\dfrac{g}{mol}\right)\end{matrix}\right.\)
\(\Rightarrow d_{X/Y}\)\(=\dfrac{4,4}{29,1}=0,15\)
bạn cho mình hỏi CH4 nặng hay nhẹ hơn không khí vậy ạ,cách tính sao ạ?
a, mX = 0,2.32 + 0,15.28 = 10,6 (g)
nX = 0,2 + 0,15 = 0,35 (mol)
=> MX = \(\dfrac{10,6}{0,35}=30,3\left(\dfrac{g}{mol}\right)\)
=> dX/kk = \(\dfrac{30,3}{29}=1,05\)
b, mY = 0,5.44 + 2.2 = 26 (g)
nY = 0,5 + 2 = 2,5 (mol)
=> MY = \(\dfrac{26}{2,5}=10,4\left(\dfrac{g}{mol}\right)\)
=> dY/O2 = \(\dfrac{10,4}{32}=0,325\)
c, mA = 17,75 + 8,4 = 26,15 (g)
nA = \(\dfrac{17,75}{71}+\dfrac{8,4}{28}=0,55\left(mol\right)\)
=> MA = \(\dfrac{26,15}{0,55}=47,6\left(\dfrac{g}{mol}\right)\)
=> dA/CO2 = \(\dfrac{47,6}{44}=1,1\)
Mình làm mẫu 3 ý đầu rồi mấy ý sau bạn tự làm nhé
\(a.\)
\(m_{hh}=m_{SO_2}+m_{CO_2}=0.15\cdot64+0.2\cdot44=18.4\left(g\right)\)
\(n_{hh}=0.15+0.2=0.35\left(mol\right)\)
\(\overline{M}_X=\dfrac{m_{hh}}{n_{hh}}=\dfrac{18.4}{0.35}=52.5\left(\dfrac{g}{mol}\right)\)
\(b.\)
\(d_{X\text{/}NO_2}=\dfrac{52.57}{46}=1.14\)
\(a.\)
\(m_{hh}=0.12\cdot90+0.15\cdot58=19.5\left(g\right)\)
\(b.\)
\(V_{hh}=\left(0.25+0.1+0.05\right)\cdot22.4=8.96\left(l\right)\)
\(c.\)
\(n_A=\dfrac{10.08}{22.4}=0.45\left(mol\right)\)
\(M_A=23\cdot2=46\left(\dfrac{g}{mol}\right)\)
\(m_A=0.45\cdot46=20.7\left(g\right)\)
\(d.\)
\(n_{hh}=\dfrac{6.72}{22.4}=0.3\left(mol\right)\)
Vì CO2 : O2 = 2 : 1
\(\Rightarrow n_{CO_2}=0.2\left(mol\right),n_{O_2}=0.1\left(mol\right)\)
\(m_{hh}=0.2\cdot44+0.1\cdot32=12\left(g\right)\)
\(\overline{M}=\dfrac{12}{0.3}=40\left(\dfrac{g}{mol}\right)\)
\(a.\overline{M}_A=\dfrac{n_{O_2}\cdot M_{O_2}+n_{N_2}\cdot M_{N_2}+n_{CO_2}\cdot M_{CO_2}+n_{H_2}\cdot M_{H_2}}{n_{O_2}+n_{N_2}+n_{CO_2}+n_{H_2}}\\ =\dfrac{0,2\cdot32+0,1\cdot28+0,05\cdot44+0,15\cdot2}{0,2+0,1+0,05+0,15}\\ =\dfrac{11,7}{0,5}=23,4\left(g/mol\right)\)
b) \(d_{hh/CH_4}=\dfrac{23,4}{16}=1,4625\)
có biết tớ là ai không?