why a balloon containing Helium gas shrinks at a faster rate than a balloon containing Carbon dioxide gas?

Question

assuming same temperature and pressure

Answer 1

helium is the most inert (ie: non reactive) element in existence. therefore the gas exists in the form of individual atoms, with two each of protons, nutrons and electrons. this makes this the second smallest atom in existence (hydrogen is first)
carbon dioxide is a molecule (ie: several atoms together) consisting of one carbon and two oxygen atoms. carbon and oxygen atoms themselves are larger than a helium atom, and when u get the 3 together its way larger than the lone helium atom.
therefore, the helium atom can get out through even the tiniest holes in a balloon, but the carbon dioxide needs a larger opening and so takes longer to get the same amt. of gas out.

Answer 2

Because the helium atom is smaller and hence can escape easier than CO2

Answer 3

Cos helium has smaller molecules (individual atoms in fact) which can escape more easily.