How can we find the molecular formula of a compound if we have its empirical formula and its vapour density

Answers (1)

We have,
The empirical formula of the compound and vapour density.
It is known that, 
Molar mass  = 2 (vapour density)
Therefore, We can calculate the molar mass of the compound. And divide the molar mass of compound with empirical formula mass, we get the value of n. Then multiply the molecules with n. In this way, we can find the molecular formula of a compound.

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