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Empirical & Molecular Formula

The ratio of ...

Question

The ratio of the mass of C-12 atom to that of an atom of element $X$ (whose atomicity is four) is 1 : 9. Themolecular mass of element $X$ is

A

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B

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C

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D

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Solution

The correct option is C

$M o l e c u l a r m a s s = \frac{w e i g h t o f m o l e c u l e}{w e i g h t o f \frac{1}{12} t h p a r t o f C - 12 a t o m}$

Mass of element X $= 9 \times 12 \times 4 = 432$

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The ratio of the mass of C-12 atom to that of an atom of element $X$ (whose atomicity is four) is 1 : 9. Themolecular mass of element $X$ is

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