A gas under a pressure of 74 mmHg and at a temperature of 348 K occupies a 500.0-L container. How many moles of gas are in the container?

1.7 moles
7.9 moles
13 moles
59 moles

okay yes , aha.

periodic trends is an atom that gets larger as the number of electronic shells increase, the radius of atoms increases as you go down a certain group in the periodic table of elements. in general, the size of an atom will decrease as you move from left to right of a certain period.