yes, its took weeks before school (for me) and i'm thinking about chemistry. my friend just approached me with a question that we can't seem to figure out - is the speed of a light gaseous molecule faster than that of a heavier one when: the temperature, pressure, and volume are held constant? the problem he showed me involved balloons with different substances, all with 1L of gas, thus the pressure is constant, and at 30 degrees C. i was taught by my chem teacher that, with gases, the only thing that mattered was the number of moles. no qualitative properties of the gas mattered (unless it increased moles), so i figured that the mass of substances wouldn't make a difference. but when we approached people who finished chem AP (two who got 5 on the ap test), their answers did not agree. so, could someone help me out? its 11:17 pm and i still haven't found an answer :x