Question

4.Identificati alcanul care are masa moleculara M=44.​

Answer 1

☞ TEORIE

Alcanii au formula generala:   $\bold{C_nH_2_n_+_2}$

✍︎ Calculam masa molara a unui alcan (folosind formula generala):

$\ M_C__nH__2n+2$ = $n * A_C +(2n+2)*A_H=12n+2n+2 = \bold{14n+2 \ g/mol}$

✐ Stim ca masa molara a alcanului cautat este 44 => 14n + 2 = 44 =>

14 n= 44-2=> 14n = 42 => n = 42/14 => n=3

Deci alcanul cautat este: C₃H₈

CH₃-CH₂-CH₃ propan