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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The mass of one mole of carbon-12 is 12 g.
The mass of one mole of X atoms will be 9×12=108 g.
The atomicity is 4.
Thus, one molecule will contain four X atoms.
Hence, the mass of one mole of the compound will be 4×108=432 g. This is the molecular weight
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