Answer to Question #127971 in Organic Chemistry for Lex

Question

Complete combustion of 0.25moles of an alkane produced 22.4dm³ of CO2 at s.t.p. The molecular formula of the alkane is likely to be???

Answer 1

Chemical amount of carbon dioxide gas n(CO₂) = 22.4/22.4 = 1 mole = n(C atoms)

The general formula of alkane is C_nH_2n+2. Thus the number of C atoms N(C) = 1/0.25=4. Thus the formula of alkane is C₄H₁₀ - butane._.