\(n_{Br_2}=0,2\cdot1=0,2mol\)
Gọi \(\left\{{}\begin{matrix}n_{C_6H_6}=x\left(mol\right)\\n_{C_2H_2}=y\left(mol\right)\end{matrix}\right.\)
\(n_{CO_2}=\dfrac{17,92}{22,4}=0,8mol\)
\(C_6H_6+Br_2\underrightarrow{Fe,t^o}C_6H_5Br+HBr\)
x x
\(C_2H_2+2Br_2\rightarrow C_2H_2Br_4\)
y 2y
\(2C_6H_6+15O_2\underrightarrow{t^o}6H_2O+12CO_2\)
x 7,5x
\(C_2H_2+\dfrac{5}{2}O_2\underrightarrow{t^o}2CO_2+H_2O\)
y 2,5y
Từ các pt trên:\(\left\{{}\begin{matrix}x+2y=0,2\\7,5x+2,5y=0,8\end{matrix}\right.\Rightarrow\left\{{}\begin{matrix}x=0,088\\y=0,056\end{matrix}\right.\)
\(m=m_{C_6H_6}+m_{C_2H_2}=0,088\cdot78+0,056\cdot26=8,32g\)
