To find the unit rate price per ounce for the hot chocolate, you can divide the total price by the number of ounces.
The total price is $5.00 and the number of ounces is 20 oz.
\[ \text{Unit rate price per ounce} = \frac{\text{Total price}}{\text{Number of ounces}} = \frac{5.00}{20} = 0.25 \]
So, the unit rate price per ounce for the hot chocolate is $0.25 per ounce.