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Câu 17
\(M_X=\dfrac{40}{0,25}=160\left(g/mol\right)\)
Câu 18
\(d_{CH_4/kk}=\dfrac{16}{29}=0,552\)
=> CH4 nhẹ hơn không khí và bằng 0,552 lần
Câu 19
\(n_{CO_2}=\dfrac{6,1975}{24,79}=0,25\left(mol\right)\)
Câu 20
\(n_{N_2}=\dfrac{12,6}{28}=0,45\left(mol\right)\)
=> \(V_{N_2}=0,45.24,79=11,1555\left(l\right)\)
\(a,M_A=22.M_{H_2}=22.2=44(g/mol)\\ b,n_A=\dfrac{6,1975}{24,79}=0,25(mol)\\ \Rightarrow m_A=0,25.44=11(g)\)
\(a.\)
\(M_A=32\cdot2=64\left(g\text{/}mol\right)\)
\(b.\)
\(n_A=\dfrac{5.6}{22.4}=0.25\left(mol\right)\)
\(m_A=0.25\cdot64=16\left(g\right)\)
\(a,M_A=2.M_{O_2}=2.32=64(g/mol)\\ b,n_A=\dfrac{5,6}{22,4}=0,25(mol)\\ m_A=0,25.64=16(g)\)
\(a,n_{CO_2}=\dfrac{V_{\left(đktc\right)}}{22,4}=\dfrac{1,2395}{22,4}=\dfrac{2479}{44800}\left(mol\right)\)
\(b,Theo.CTHH:CO_2\\ \Rightarrow n_C=n_{CO_2}=\dfrac{2479}{44800}\left(mol\right)\\ n_O=2n_{CO_2}=2.\dfrac{2479}{44800}=\dfrac{2479}{22400}\left(mol\right)\\ \Rightarrow m_C=n.M=\dfrac{2479}{44800}.12=\dfrac{7437}{12200}\left(g\right)\\ m_O=n.M=\dfrac{2479}{22400}.16=\dfrac{2479}{1400}\left(g\right)\)
\(c,số.phân.tử.CO_2:n.6.10^{23}=\dfrac{2479}{44800}.6.10^{23}=\dfrac{23240625.10^{16}}{7}\)
a) \(n_{CuO}=\dfrac{4}{80}=0,05\left(mol\right)\)
b) \(V_{CO_2}=0,2.22,4=4,48\left(l\right)\)
c) \(M_A=1,172.29=34\left(g/mol\right)\)
\(n_A=\dfrac{33,6}{22,4}=1,5\left(mol\right)\)
=> mA = 1,5.34 = 51(g)
\(n_{CO_2}=\dfrac{6,1975}{24,79}=0,25\left(mol\right)\)
=> \(m_{CO_2}=0,25.44=11\left(g\right)\)
\(a.\)
\(n_{hh}=0.2+0.15+0.1=0.45\left(mol\right)\)
\(V_X=0.45\cdot22.4=10.08\left(l\right)\)
\(b.\)
\(m_X=0.2\cdot28+0.15\cdot71+0.1\cdot32=19.45\left(g\right)\)
\(c.\)
\(\overline{M}_X=\dfrac{19.45}{0.45}=43.22\left(g\text{/}mol\right)\)
\(d.\)
\(d_{X\text{/}kk}=\dfrac{43.22}{29}=1.4\)
Nặng hơn không khí 1.4 lần
Câu 17 :$M = \dfrac{m}{n} =\dfrac{49}{0,2} = 245(g/mol)$
Câu 18 : $d_{N_2/H_2} = \dfrac{28}{2} = 14 > 1$
Do đó, $N_2$ nặng hơn hydrogen 14 lần
Câu 19 : $n = \dfrac{V}{22,4} = \dfrac{12,395}{22,4} = 0,55(mol)$
Câu 20 : $n_{CO_2} = \dfrac{6,1975}{22,4} = 0,277(mol)$
$m_{CO_2} = 0,277.44 = 12,188(gam)$
Câu 17:
\(M_X=\dfrac{m}{n}=\dfrac{49}{0,2}=245\left(\dfrac{g}{mol}\right)\)
Câu 18:
\(d_{\dfrac{N_2}{H_2}}=\dfrac{28}{2}=14\)
Vậy khí Nito nặng hơn khí hidro 14 lần
Câu 19:
\(n_{NH_3}=\dfrac{V_{\left(dktc\right)}}{22,4}=\dfrac{12,395}{22,4}=\dfrac{2587}{4480}\left(mol\right)\)
Câu 20:
\(n_{CO_2}=\dfrac{V_{\left(dktc\right)}}{22,4}=\dfrac{6,1975}{22,4}=\dfrac{2479}{8960}\left(mol\right)\\ m_{CO_2}=n.M=\dfrac{2479}{8960}.44=12\left(g\right)\)