How does one determine a molecular formula from the empirical formula? Need Help!!!
15 Points!!

A) Multiply subscripts in the empirical formula by molar mass/empirical formula mass
B) Multiply subscripts in the empirical formula by empirical formula mass/molar mass
C) Multiply subscripts in the empirical formula by molar mass/grams of element
D) Multiply subscripts in the empirical formula by grams of element/ molar mass

To make the compound have the molar mass given, you need to increase the empirical formula mass to the molar mass given. An easy way to do that is to multiply by the molar mass/empirical formula mass.

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Tutorconsortium330 Tutorconsortium330 · Answer 2 · 2022-07-08T14:08:15+02:00

Multiply subscripts in the empirical formula by molar mass/empirical formula mass.

Molecular Formula = n × Empirical Formula

n = Molecular Formula/Empirical Formula

Or

n = Molecular mass/Empirical formula mass

For example:

Given, that the empirical formula of boron and hydride is BH₃. Its molecular mass is 27.7 g. Now we have to find the molecular formula of the compound

Molecular mass = 27.7 g

Molar mass of boron = 10.8 g

Molar mass of 3 hydrogen atoms = 3 × 1 = 3 g

Empirical formula mass = 10.8 + 3 = 13.8 g

n = Molecular mass/Empirical formula mass

= 27.7/ 13.8

n = 2

Multiply all the subscripts in the empirical formula by the whole number "n" = BH₃ × 2

= B₂H₆

Hence, the molecular formula is B₂H₆

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