Question

Explain why a balloon filled with O2 at room temperature collapses when cooled in liquid nitrogen, whereas a balloon filled with He does not

Answer 1

The balloon filled with 02 collapses because the gas molecules are attracted to each other and condense into a liquid when cooled. Helium, on the other hand, is a noble gas that does not form compounds with other elements and therefore does not condense into a liquid at low temperatures.