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Q.

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

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a

84 g mol-1

b

36 g mol-1

c

432 g mol-1

d

480 g mol-1

answer is B.

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Detailed Solution

Atomic mass of carbon = 12

Atomic mass of X =12×9=108 grams

Molecular X4 mass=108×4

=432g/mol

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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. The molecular mass of element X is