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

$480 g m o l^{- 1}$

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$432 g m o l^{- 1}$

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$72 g m o l^{- 1}$

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$108 g m o l^{- 1}$

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Solution

The correct option is B
$432 g m o l^{- 1}$

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

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

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Similar questions

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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