a) nNaOH=20/40=0,5(mol)

nN2=1,12/22,4=0,05(mol)

nNH3= (0,6.10²³)/(6.10²³)=0,1(mol)

b) mAl2O3= 102.0,15= 15,3(g)

mSO2= nSO2 . M(SO2)= V(CO2,đktc)/22,4 . 64= 6,72/22,4. 64= 0,3. 64= 19,2(g)

mH2S= nH2S. M(H2S)= (0,6.10²³)/(6.10²³) . 34=0,1. 34 = 3,4(g)

c) V(CO2,đktc)=0,2.22.4=4,48(l)

nSO2=16/64=0,25(mol) -> V(SO2,đktc)=0,25.22,4=5,6(l)

nCH4=(2,1.10²³)/(6.10²³)=0,35(mol) -> V(CH4,đktc)=0,35.22,4=7,84(l)

a,n=m/M=20/(23+17)20:40=0,5(mol)

n=V/22,4=11,2/22,4=0,5(mol)

n=số pt/số Avogađro=6.10^23:6.10^23=1

\(3.1.\left(a\right)M_P=31\left(g/mol\right);\\ M_{Fe}=56\left(g/mol\right);\\ M_{H_2}=2\left(g/mol\right);\\ M_{O_2}=32\left(g/mol\right)\\ \left(b\right).M_{P_2O_5}=31.2+16.5=142\left(g/mol\right);\\ M_{Fe_3O_4}=56.3+16.4=232\left(g/mol\right);\\ M_{HCl}=1+35,5=36,5\left(g/mol\right);\\ M_{BaO}=137+16=153\left(g/mol\right)\\ c.M_{H_2SO_4}=2+32+16.4=98\left(g/mol\right);\\ M_{ZnCl_2}=65+35,5.2=136\left(g/mol\right);\\ M_{Al_2\left(SO_4\right)_3}=27.2+\left(32+16.4\right).3=342\left(g/mol\right);\\ M_{Ca\left(OH\right)_2}=40+17.2=74\left(g/mol\right)\)

\(3.2\left(a\right).n_{CH_4}=\dfrac{2,8}{22,4}=0,125\left(mol\right)\\ n_{O_2}=\dfrac{13,44}{22,4}=0,6\left(mol\right)\\ \left(b\right).n_{CuO}=\dfrac{2}{80}=0,025\left(mol\right)\\ n_{Al_2\left(SO_4\right)_3}=\dfrac{3,42}{342}=0,01\left(mol\right)\)

\(3.3\left(a\right).m_{HNO_3}=0,5.63=31,5\left(g\right)\\ m_{MgCl_2}=2.95=190\left(g\right)\\ \left(b\right).m_{CO_2}=\dfrac{5,6}{22,4}.44=11\left(g\right)\\ m_{H_2}=\dfrac{1,12}{22,4}.2=0,1\left(g\right)\)

Bài 5:

\(m_{Y}=m_{SO_2}+m_{CH_4}=\dfrac{3,36}{22,4}.64+\dfrac{13,44}{22,4}.16=19,2(g)\)

Bài 6:

\(V_{CO_2}=0,15.22,4=3,36(l)\\ V_{NO_2}=0,2.22,4=4,48(l)\\ V_{SO_2}=0,02.22,4=0,448(l)\\ V_{N_2}=0,03.22,4=0,672(l)\)

\(n_{O_2}=\dfrac{16}{32}=0,5\left(mol\right)=>V_{O_2}=0,5.22,4=11,2\left(l\right)\)

=> A

Theo gt ta có: $n_{O_2}=0,6(mol);n_{hh}=0,25(mol)$

a, $CH_4+2O_2\rightarrow CO_2+2H_2O$

$C_2H_4+3O_2\rightarrow 2CO_2+2H_2O$

Gọi số mol CH4 và C2H4 lần lượt là a;b(mol)

Ta có: $a+b=0,25;2a+3b=0,6\Rightarrow a=0,15;b=0,1$

b, Suy ra $\%V_{CH_4}=60\%;\%V_{C_2H_4}=40\%$

c, Ta có: $n_{CaCO_3}=n_{CO_2}=0,15+0,1.2=0,35(mol)\Rightarrow m_{CaCO_3}=35(g)$

\(a)\\ CH_4 + 2O_2 \xrightarrow{t^o} CO_2 + 2H_2O\\ C_2H_4 + 3O_2 \xrightarrow{t^o} 2CO_2 + 2H_2O\\ b)\ V_{CH_4} = a(lít) ; V_{C_2H_4} = b(lít)\\ \Rightarrow a + b = 5,6(1)\\ V_{O_2} = 2a + 3b = 13,44(2)\\ (1)(2)\Rightarrow a = 3,36 ; b = 2,24\\ \%V_{CH_4} = \dfrac{3,36}{5,6}.100\% = 60\%\\ \%V_{C_2H_4} = 40\%\\ c) V_{CO_2} = a + 2b = 7,84(lít)\\\)

\(CO_2 + Ca(OH)_2 \to CaCO_3 + H_2O\\ n_{CaCO_3} = n_{CO_2} = \dfrac{7,84}{22,4} = 0,35(mol)\\ \Rightarrow m_{CaCO_3} = 0,35.100 = 35(gam)\)

a, PT: \(CH_4+2O_2\underrightarrow{t^o}CO_2+2H_2O\)

\(C_2H_4+3O_2\underrightarrow{t^o}2CO_2+2H_2O\)

b, Giả sử: \(\left\{{}\begin{matrix}n_{CH_4}=x\left(mol\right)\\n_{C_2H_4}=y\left(mol\right)\end{matrix}\right.\)

\(\Rightarrow x+y=\dfrac{5,6}{22,4}=0,25\left(1\right)\)

Ta có: \(n_{O_2}=\dfrac{13,44}{22,4}=0,6\left(mol\right)\)

Theo PT: \(n_{O_2}=2n_{CH_4}+3n_{C_2H_4}=2x+3y\)

⇒ 2x + 3y = 0,6 (2)

Từ (1) và (2) \(\Rightarrow\left\{{}\begin{matrix}x=0,15\left(mol\right)\\y=0,1\left(mol\right)\end{matrix}\right.\)

\(\Rightarrow\left\{{}\begin{matrix}\%V_{CH_4}=\dfrac{0,15}{0,25}.100\%=60\%\\\%V_{C_2H_4}=40\%\end{matrix}\right.\)

b, Theo PT: \(n_{CO_2}=n_{CH_4}+2n_{C_2H_4}=0,35\left(mol\right)\)

PT: \(CO_2+Ca\left(OH\right)_2\rightarrow CaCO_{3\downarrow}+H_2O\)

Theo PT: \(n_{CaCO_3}=n_{CO_2}=0,35\left(mol\right)\)

\(\Rightarrow m_{CaCO_3}=0,35.100=35\left(g\right)\)

Bạn tham khảo nhé!

nBr2 = 16 / 160 = 0.1 (mol) 

nhh = 5.6 / 22.4 = 0.25 (mol ) 

C2H4 + Br2 => C2H4Br2 

0.1..........0.1

%VC2H4 = 40% 

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