Question

Approximate atomic weight is of an element is $26.89g$. If its equivalent weight is $8.9g$, the exact atomic weight of element would be:

• A. $29.89$
• B. $8.9$
• C. $17.8$
• D. $26.7$

Answer 1

The correct option is D $26.7$

Atomic weight = Equivalent weight $\times$ Valency

$\Rightarrow$ Valency $=\frac{\text{approx. at. wt.}}{\text{Eq. wt.}}$

Eq. wt. $=8.9g\left(\text{Given}\right)$

$\therefore$ Valency $=\frac{26.89}{8.9}=3$

$\Rightarrow$ At. wt. $=8.9\times 3=26.7g$

So, the correct option is $D$