Question

The sodium salt of methyl orange has $7\%$ sodium by mass. What is the minimum molecular weight of compound :-

• A. $420u$
• B. $375u$
• C. $329u$
• D. $295u$

Answer 1

Answer: (C)

$7=\frac{1\times 23}{M_w}\times 100$
$M_w=329$