Ankin có dạng CnH2n−2
Đốt cháy ankin
\(C_nH_{2n-2}+\left(1,5n-0,5\right)O_2\rightarrow nCO_2+\left(n-1\right)H_2O\)
\(n_{CO2}=\frac{19,8}{44}=0,45\left(mol\right)\)
\(n_{H2O}=\frac{5,4}{18}=0,3\left(mol\right)\)
\(\Rightarrow n_{Ankin}=n_{CO2}-n_{H2O}=0,45-0,3=0,15\left(mol\right)\)
Cho ankin tác dụng với hidro
\(C_nH_{2n-2}+2H_2\rightarrow C_nH_{2n+2}\)
\(\Rightarrow n_{H2}=2n_{ankin}=0,15.2=0,3\left(mol\right)\)
\(\Rightarrow V_{H2}=0,3.22,4=6,72\left(l\right)\)