During a storm, an apartment building lost power for 2.6 hours. For how many seconds was the power out?

To convert hours to seconds, we use the fact that 1 hour is equal to 3600 seconds.

First, calculate the total seconds in 2.6 hours:

\[
2.6 \, \text{hours} \times 3600 \, \text{seconds/hour} = 9360 \, \text{seconds}
\]

Therefore, the power was out for **9360 seconds**.