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Q.
A compound has the molecular formula $X_{4} O _{6} .$ If $10\, g$ of $X _{4} O _{6}$ has $5.72\, g X$, then calculate atomic mass of $X$.
ManipalManipal 2012Structure of Atom
Solution:
Molecular weight of $X_{4} O _{6}=(4 a+96)$
$\because(4 a+96) g X_{4} O _{6}$ contains $X=4\, a g$
$\therefore 10\, g X_{4} O _{6}$ contains $X =\frac{4 a \times 10}{4 a+96}$
$5.72 =\frac{4 a \times 10}{4 a+96}$
$22.88 a+549.12 =40\, a$
$17.12 a =549.12$
$a =32.07$ amu .