Mole ConceptMedium
Question
The molecular formula of a compound is X4O9. If the compound contains 40% X by mass, then what is the atomic mass of X?
Options
A.24
B.12
C.26
D.13
Solution
$\frac{4}{9} = \frac{40/A_{X}}{60/16} \Rightarrow \text{Atomic mass of X, }A_{X} = 24$
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