Question

percent composition and molecular formula
quiz complete
1 2 3 4 5 6 7 8 9 10
which represents the empirical formula for a₃b₉?
○ ab₃
○ ab₂
○ a₃b₉
○ a₉b₂7

Explanation:

The empirical formula is the simplest whole number ratio of atoms in a compound. For A₃B₉, divide each subscript by the greatest common divisor (3): $\frac{3}{3}=1$ for A, $\frac{9}{3}=3$ for B, resulting in AB₃.

Answer:

AB₃