Đáp án là C. 80 ml

Đáp án B

\(n_{H_2S}=\dfrac{8.96}{22.4}=0.4\left(mol\right)\)

\(H_2S+\dfrac{3}{2}O_2\underrightarrow{^{^{t^0}}}SO_2+H_2O\)

\(0.4.................0.4\)

\(n_{NaOH}=n_{SO_2}=0.4\left(mol\right)\)

=> Tạo muối axit

\(NaOH+SO_2\rightarrow NaHSO_3\)

\(0.4............................0.4\)

\(m_{NaHSO_3}=0.4\cdot104=41.6\left(g\right)\)

\(n_{H_2S}=\dfrac{8,96}{22,4}=0,4\left(mol\right)\\ n_{NaOH}=0,25.2=0,5\left(mol\right)\)

Xét \(T=\dfrac{0,5}{0,4}=1,25\) => Tạo cả 2 muối Na₂S và NaHS

PTHH: 

2NaOH + H₂S ---> Na₂S + 2H₂O

0,5------->0,25------>0,25

Na₂S + H₂S ---> 2NaHS 

0,15<--0,15----->0,3

=> m_muối = 0,3.56 + (0,25 - 0,15).78 = 24,6 (g)

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!

Đáp án B

a, \(4P+5O_2\underrightarrow{t^o}2P_2O_5\)

b, \(n_P=\dfrac{6,2}{31}=0,2\left(mol\right)\)

\(n_{O_2}=\dfrac{8,96}{22,4}=0,4\left(mol\right)\)

Xét tỉ lệ: \(\dfrac{0,2}{4}< \dfrac{0,4}{5}\), ta được O₂ dư.

Theo PT: \(n_{O_2\left(pư\right)}=\dfrac{5}{4}n_P=0,25\left(mol\right)\Rightarrow n_{O_2\left(dư\right)}=0,4-0,25=0,15\left(mol\right)\)

\(\Rightarrow m_{O_2\left(dư\right)}=0,15.32=4,8\left(g\right)\)

c, Theo PT: \(n_{P_2O_5}=\dfrac{1}{2}n_P=0,1\left(mol\right)\Rightarrow m_{P_2O_5}=0,1.142=14,2\left(g\right)\)

d, \(m_{P_2O_5}=14,2.80\%=11,36\left(g\right)\)

Giúp mik vs T-T