To find the molecular formula from the empirical formula, one must determine the compounds

Relative molecular of the compound or infomation like vapour density, volume occupied by a known mass of its vapour at stp, etc

Explanation:

The molecular mass of a compound is twice its vapour density. We can find the molecular formula using the relationship below:

   Empirical formula is the simplest formula of a compound. It repeats itself "n" times to become a molecular formula i.e (EF)ₙ = MF n is the number of times the empirical formula presents in a mole of the compound. Most times, n is a whole number like 1,2,3,

Ithink 2 is the correct

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