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The ratio of the mass of C-12 atom to th...

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 :-

A

`480 g mol^(-1)`

B

`432 g mol^(-1)`

C

`36 g mol^(-1)`

D

`84 g mol^(-1)`

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