Frequently Asked Question

Questions asked by users might not always be phrased in the clearest way.

A compound’s empirical formula is C2H3. if the formula mass is 135 amu, what is the molecular formula?

Accepted Answer

The molecular formula is C6H9. Here's how to find it:
1. Calculate the empirical formula mass: (2
12.01 amu/C) + (3
1.01 amu/H) = 27.05 amu
2. Determine the ratio between the molecular mass and the empirical formula mass: 135 amu / 27.05 amu = 5
3. Multiply the subscripts in the empirical formula by the ratio: C2
5 = C6 and H3
5 = H9
Therefore, the molecular formula is C6H9.


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