A sample of oxygen gas occupies a volume of 229.5 mL at 762.7 torr pressure. What volume in mL will it occupy at 704.5 torr pressure?

248.4 mL

Explanation:

In order to answer this problem we can use Boyle's law, which states that at a constant composition:

Where in this case:

We input the data:

And solve for V₂:

that tool would be a compass

it's c (engineer's do their work with mechanical stuff not on any living being)