Need with one chemistry question about oxygen!

Acylinder is filled with 2.00 moles of nitrogen, 3.00 moles of argon and 5.00 moles of helium. if the gas mixture is at stp, what is the partial pressure of the argon

This is a characteristic of the elements in the periodic table that shows a pattern. it may increase or decrease across or down the table.

Which piece of equipment would me most useful for measuring the volume of some water? a. pan balance b. graduated cylinder c. tweezers d. flask quick