Asymbiotic relationship in which both partners benifit

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.

8) a mixture of he, ne and ar has a pressure of 7.85 atm. if the ne has a mole fraction of 0.47 and 8) ar has a mole fraction of 0.23, what is the pressure of he? a) 4.2 atm b) 3.7 atm c) 5.5 atm d) 2.4 atm e) 1.8 atm

The fact that the total amount of energy in a system remains constant is a(n)