Question

Urgent,va roooooog
ex 7

Answer 1

acid alcanoic => un acid carboxilic saturat => CnH2n+1COOH

ro = p = ms / Vs => ms = p x Vs = 1,4 x 5 = 7 g sol KOH = ms

c% = mdx100/ms => md = msxc%/100 = 7 x 40 / 100 = 2,8 g KOH

  3,7 g ....................... 2,8 g

CnH2n+1COOH  +  KOH => CnH2n+2COOK  +  H2O

    M ............................. 56

=> M = masa moleculara = 56x3,7/28 = 74 g/mol

=> 14n = 74 - 46 => n = 2

=> CnH2n+1COOH este CH3COOH = acid acetic