\(m_{CH_4} = 8.30\% = 2,4(gam)\\ m_{C_2H_4} = 8 - 2,4 = 5,6(gam)\\ CH_4 + 2O_2 \xrightarrow{t^o} CO_2 + 2H_2O\\ C_2H_4 + 3O_2 \xrightarrow{t^o} 2CO_2 + 2H_2O\\\)

Theo PTHH :

\(n_{CO_2} = n_{CH_4} + 2n_{C_2H_4} = \dfrac{2,4}{16} + \dfrac{5,6}{28}.2 = 0,55(mol)\\ \Rightarrow m_{CO_2} = 0,55.44 = 24,2(gam)\)

\(m_{CH_4}=0.3\cdot8=2.4\left(g\right)\)

\(n_{CH_4}=\dfrac{2.4}{16}=0.15\left(mol\right)\)

\(m_{C_2H_4}=8-2.4=5.6\left(g\right)\)

\(n_{C_2H_4}=\dfrac{5.6}{28}=0.2\left(mol\right)\)

\(CH_4+2O_2\underrightarrow{t^0}CO_2+2H_2O\)

\(C_2H_4+3O_2\underrightarrow{t^0}2CO_2+2H_2O\)

\(n_{CO_2}=2\cdot0.15+0.2=0.5\left(mol\right)\)

\(m_{CO_2}=0.5\cdot44=22\left(g\right)\)

\(m_C=10.36\%=3,6\left(g\right)\Rightarrow n_C=0,3\left(mol\right)\)

\(m_S=10-3,6=6,4\left(g\right)\Rightarrow n_S=0,2\left(mol\right)\)

\(C+O_2-^{t^o}\rightarrow CO_2\)

\(S+O_2-^{t^o}\rightarrow SO_2\)

\(n_{O_2}=0,3+0,2=0,5\left(mol\right)\)

Vì oxi chiếm 20% thể tích không khí 

=> \(V_{kk}=\dfrac{0,5.22,4}{20\%}=56\left(lít\right)\)

\(n_{hh}=n_{CO_2}+n_{SO_2}=0,3+0,2=0,5\left(mol\right)\)

=> \(V_{hh}=0,5.22,4=11,2\left(lít\right)\)

PTHH: 

mS=10−3,6=6,4(g)⇔nS=6,432=0,2(mol)mS=10−3,6=6,4(g)⇔nS=6,432=0,2(mol)

VO2=(0,3+0,2)22,4=11,2(l)VO2=(0,3+0,2)22,4=11,2(l)

mhh=mCO2+mSO2=0,3.44+0,2.64=26(g)

Các PTHH:

\(C+O_2->CO_2\)

\(S+O_2->SO_2\)

Ta tính khối lượng cacbon trong hỗn hợp:

\(m_C=\dfrac{9,84\cdot20}{100}=1,97\left(g\right)\)

=> Số mol của C là

\(n_C=\dfrac{1,97}{12}=0,164\left(mol\right)\)

PT:

\(C+O_2->CO_2\)

Theo PT:

\(n_{CO_2}=n_C=0,164\left(mol\right)\)

\(m_S=9,84-m_C=9,84-1,97=7,87\)(g)

\(n_S=\dfrac{7,87}{32}=0,246\left(mol\right)\)

=> \(\%m_{CO_2}=\dfrac{0,164\cdot44\cdot100}{0,164\cdot44+0,246\cdot64}=31,43\%\)

=> \(\%m_{SO_2}=100\%-31,43\%=68,57\%\)

\(n_{P_2O_5}=\dfrac{28,4}{142}=0,2\left(mol\right)\)

\(n_{SO_2}=\dfrac{5,6}{22,4}=0,25\left(mol\right)\)

PTHH: 4P + 5O₂ --t^o--> 2P₂O₅

           0,4<--------------0,2

            S + O₂ --t^o--> SO₂

           0,25<----------0,25

=> \(\left\{{}\begin{matrix}\%m_P=\dfrac{0,4.31}{0,4.31+0,25.32}.100\%=60,78\%\\\%m_S=\dfrac{0,25.32}{0,4.31+0,25.32}.100\%=39,22\%\end{matrix}\right.\)

\(1,2\ tạ = 120\ kg\\ \%C = 100\% - 0,75\% - 1,25\% = 98\% \\ C + O_2 \xrightarrow{t^o} CO_2\\ S + O_2 \xrightarrow{t^o} SO_2\\ n_{CO_2} = n_C = \dfrac{120.98\%}{12} = 9,8(kmol)\\ n_{SO_2} = n_S = \dfrac{120.0,75\%}{32} = 0,028125(kmol)\\ \Rightarrow M_A = \dfrac{9,8.44 + 0,028125.64}{9,8 + 0,028125} =44,06(g/mol)\\ d_{A/không\ khí} = \dfrac{44,06}{29} = 1,519 \)

\(\%C=100-0.75-1.25=98\%\)

\(n_C=\dfrac{1.2\cdot100}{12}\cdot98\%=9.8\left(mol\right)\)

\(n_S=0.75\%\cdot\dfrac{1.2\cdot100}{32}=0.028125\left(mol\right)\)

\(C+O_2\underrightarrow{^{t^0}}CO_2\)

\(S+O_2\underrightarrow{^{t^0}}SO_2\)

\(V_A=V_{CO_2}+V_{SO_2}=9.8\cdot22.4+0.028125\cdot22.4=220.15\left(l\right)\)

\(\overline{M}_A=\dfrac{9.8\cdot44+0.028125\cdot64}{9.8+0.028125}=44\left(g\text{/}mol\right)\)

\(d_{A\text{/}kk}=\dfrac{44}{29}=1.5\)

Đổi 1,2 tạ = 120000 g

Khối lượng S là 120000.0,075=9000 g

=> n_S=9000/32=281,25 mol

Khối lượng C là 120000.(100-0,75-1,25):100=117600 g

=> n_C=117600/12=9800 mol

PTPƯ

C                 + O₂ ---> CO₂

9800 mol -------------> 9800 mol

S                 + O₂ ---> SO₂

281,25 mol ----------> 281,25 mol

Nên V_A=(9800.22,4)+(281,25.22,4)=225820 l

Tỉ khối so với kk 

M_A/M_kk=[(12+16×2)+(32+16×2)]/29=108/29~3,72

Nên khí A nặng hơn ko khí 

hỗn hợp X gồm gì thế em

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: \(n_{KMnO_4}=2n_{O_2}=0,6mol\)

\(\Rightarrow m_{KMnO_4}=0,6\cdot158=94,8\left(g\right)\)

ko phải e làm đâu nha a , a tham khảo cho 

a)CH4 + 2O2 →→ CO2 + 2H2O (1)

2H2 + O2 →→ 2H2O (2)

b) Đặt nCH4 = a (mol) , nH2 = b (mol)

=> mCH4 = 16a(g) , mH2 = 2b(g)

mà n(CH4 + H2) = V/22,4 = 6,72/22,4 = 0,3(mol)

=> a + b = 0,3(mol) => a = 0,3 - b

Từ PT(1) => nO2 = 2nCH4 = 2a(mol)

Từ PT(2) => nO2 = 1/2 . nH2 = 1/2 . b (mol)

=>tổng nO2 = 2a + 1/2.b (mol)

=> mO2 = n .M = 32. (2a+ 1/2.b )= 64a + 16b(g)

Theo ĐLBTKL:mCH4 + mH2 + mO2 = mCO2 + mH2O(PT1,2)

=> 16a + 2b+ 64a +16b = 11,6

=> 80a + 18b = 11,6

=> 80. (0,3 - b ) + 18b = 11,6

=> b = 0,2(mol)

=> a = 0,3 - 0,2 = 0,1(mol)

=>mCH4 = 16a = 16. 0,1 = 1,6(g) , mH2 = 2b = 2 . 0,2 = 0,4(g)

=> VCH4 = n .22,4 = 0,1 . 22,4 =2,24(l)

VH2 = n . 22,4 = 0,2 . 22,4 = 4,48(l)

tự tính ... 

c) nO2 = 2a + 1/2 .b = 2 . 0,1 + 1/2 . 0,2 = 0,3(mol)

=> VO2 = 0,3 . 22,4 =6,72(l)

mà VO2 = 20% Vkk

=> Vkk = 6,72 : 20% =33,6(l)