Gọi ankin là CnH2n−2
\(C_nH_{2n-2}+\left(1,5n-0,5\right)O_2\rightarrow nCO_2+\left(n-1\right)H_2O\)
\(V_{CO2}=1,792\left(l\right)\Rightarrow V_{ankin}=\frac{1,792}{n}\left(l\right)\)
\(\Rightarrow V_{O2}=\frac{1,792}{n}.\left(1,5n-0,5\right)\)
\(\Rightarrow V_{hh}=\frac{1,792}{n}+\frac{1,792}{n}.\left(1,5n-0,5\right)=2,912\)
\(\Rightarrow n=4\)
Vậy ankin là C4H6 :butin