Question

The equivalent mass of metal M is $x$ and the formula of its oxide is $M_n{O}_m$. The atomic mass of metal is :

• A. $\frac{2n-x}{m}$
• B. $\frac{2mx}{n}$
• C. $\frac{2mn}{x}$
• D. $\frac{mn}{x}$

Answer 1

Answer: (B)

$\frac{2mx}{n}$

In $M_n{O}_m$, if valence of $M$ is $v$, then

$n\times v=2\times m$

$\therefore v=\frac{2m}{n}$

Atomic mass $=equivalentmass\times valence=\frac{x\times 2m}{n}=\frac{2mx}{n}$