Question

What is the volume of 2.29 mol O2?

Answer in units of L

Answer 1

at STP 1 mole occupies 22.4L, so ...

Answer 2

I worked a problem just like this for you a few hours ago. After you see how these problems are solved you shouldn't need help on an identical problem.

This this:
https://www.jiskha.com/questions/1861772/you-are-planning-an-experiment-that-requires-0-141-mol-of-nitrogen-monoxide-gas-no-what