PLEASE ANSWER!
Given a jar holds 2.25 moles of NH3 , 3.75 miles of NO, and 12.5 moles of O2, what is the mole fraction of oxygen

the density(ratio between mass and volume as m/v) decreases from top to bottom in periodic table group as the size increases and nuclear charge decreases. but in periods density increases from left to right as atom size decreases and nuclear charge increases.

ugh fiel iente of insistí is did kiwis jaj

the answer is a for sure mark brainliest i had got this right on usatestprep