which represents the empirical formula for a3b9?\no ab3\no ab2\no a3b9\no a9b27

Answer:

A. $AB_{3}$

Explanation:

Step1: Find greatest - common factor

The sub - scripts of $A_3B_9$ are 3 and 9. The greatest common factor of 3 and 9 is 3.

Step2: Divide sub - scripts by GCF

Divide the sub - script of A (3) and the sub - script of B (9) by 3. $\frac{3}{3}=1$ and $\frac{9}{3}=3$. So the empirical formula is $AB_{3}$.