Question

One mole of one of the sodium salts listed below, having carbon content close to $14.3$%, produces $1$ mole of carbon dioxide upon heating (atomic mass $Na=23,H=1,C=12,O=16)$. The salt is :

• A. $C_2{H}_{5}COONa$
• B. $NaHC{O}_3$
• C. $HCOONa$
• D. $C{H}_{3}COONa$

Answer 1

The correct option is B $NaHC{O}_3$

Given

Carbon content in sodium salt is 14.3%

It produces 1 mole of $C{O}_2$

Solution

1) $C_2{H}_{5}COONa$

Molecular Mass = 12*2+5*1+12+16+16+23= 96

Percentage of C in it =$\frac{12}{96}\ast 100=12.5$

2) $NaHC{O}_3$

Molecular Mass = 23+1+12+3*16= 84

Percentage of C in it =$\frac{12}{84}\ast 100=14.28$

3) $HCOONa$

Molecular Mass= 1+12+16+16+23= 68

Percentage of C in it =$\frac{12}{68}\ast 100=17.64$

4) $C{H}_{3}COONa$

Molecular Mass= 12+3*1+12+16+16+23= 82

Percentage of C in it =$\frac{12}{82}\ast 100=14.63$

The correct option is B