What information do you need to calculate the percentage composition of a compound?

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

Will mark brainliest how many electrons can be held in the energy level n = 4?

Consider the story you just read. all but one of the choices below indicate that something is living.