59 g of an amide obtained from a carboxylic acid, RCOOH, upo... | Chemistry | SolveeIt | Solveeit

Today, August 19

Question

59 g of an amide obtained from a carboxylic acid, RCOOH, upon heating with alkali liberated 17 g of ammonia. The acid is

A

Formic acid

B

Acetic acid

C

Propionic acid

D

Benzoic acid.

Answer

Acetic acid

Explanation

Solution

$RCONH_2 + NaOH \rightarrow RCOONa + NH_3$ As 1 mole of NH3 is given by one mole of amide. Thus mol. mass of $RCONH_2$ is A + 12 + 16 + 14 + 2 = 59 or A + 44 = 59 A = 59 - 44 = 15 Hence alkyl group with mol. mass A = 15 is $CH_3$ Thus, acid is $CH_3COOH$ .