Three 3.0 L sealed flasks , each at a pressure of 878 mmHg contain He, Ar, and Xe respectively. a) which of the flasks contain the greatest number of moles of gas? b) which of the flasks contain the greatest mass of gas? c) If He flask was heated and Ar flask was cooled, which of the three flasks would be at the highest pressure? d) If the temperature of the He was lowered while the Xe was raised, which of the three gases would have the greatest kinetic energy?

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.

the answer is 303.15 or 303

under a microscope, cancer cells may look very different from normal cells. they often have different sizes and some may be larger than normal while others are smaller. cancer cells are often abnormally shaped and the control centre of the cell (the nucleus) may have an abnormal appearance.

i think? ?

catya your not at all which answer i've seen you do this on another question!