CnH2n+1COONa + NaOH → CnH2n+2    + Na2CO3                                                                                                

               1 моль                               1 моль

    (14n +68) г ∕моль                       22,4 л ∕ моль

n(CnH2n+2 ) = 1,792 л : 22,4 л ∕ моль = 0,08 моль

n (CnH2n+1COONa  ) = 0,08 моль                                                                                               

0,08 моль = 9,92 ∕ 14n + 68; n = 4                                                                                              

С4 Н10 – бутан и 2-метилпропан (изобутан)