Question

1.35 gm $X$ element is completely converted to 1.88 gm compound $XO$. What is the atomic weight of $X$?

• A. 20.32
• B. 40.64
• C. 16.25
• D. 56.1

Answer 1

The correct option is B 40.64

As we know,
Eq. wt of metal $=\frac{Massofmetal}{Massofoxygen}\times 8$

$=\frac{1.35}{1.88-1.35}\times 8$
$=20.32$
Valency of metal in oxide = 2
Atomic weight of $x=$ Eq. wt $\times$ valency $=20.32\times 2=40.64$