Which type of formula represents the simplest whole-number ratio of atoms of the elements in a compound?

The empirical formula represents the simplest whole number shows the simplest whole number ratio of atoms in a compound.  An example of this is the empirical formula for glucose (C₆H₁₂O₆) is C₃H₆O₃.  

I hope this helps.  Let me know if anything is unclear.

(a)

(b)

(c)

(d)

(e)

Explanation:

The equilibrium constant (Kc) is the product of the concentration of the products raised to their stoichiometric coefficients divided by the product of the concentration of the reactants raised to their stoichiometric coefficients. The equilibrium constant includes only gases and aqueous species (not liquids or solids). The temperature will define the state of aggregation of the substances and the numerical value of Kc.

(a) O₂(g) + 2 F₂(g) ⇄ 2 F₂O(g) (T = 100 °C)

(b) I₂(s) + Br₂(l) ⇄ 2 IBr(g) (T = 0.0 °C)

(c) 2 LiOH(s) + CO₂(g) ⇄ Li₂CO₃(s) + H₂O(g) (T = 575 °C)

(d) N₂O₃ (g) ⇄ NO(g) + NO₂(g) (T = −10.0 °C)

(e) SnCl₄(l) ⇄ SnCl₄(g) (T = 200 °C)