Final answer:
The rate at which the temperature of the compound rose is 5 degrees per hour.
Step-by-step explanation:
To calculate the rate at which the temperature of the compound rose, we need to find the temperature change per hour. Given that the temperature rose 2 1/2 degrees every 2/5 of an hour, we can set up a proportion.
2 1/2 degrees / 2/5 hour = x degrees / 1 hour
Simplifying the proportion, we have 5/2 * 2/5 = x/1, which gives x = 5 degrees per hour. Therefore, the rate at which the temperature of the compound rose is 5 degrees per hour.