You have two balloons of equal volume at room temperature and 1 atm pressure. One balloon is filled with He and the other is filled with H2. Which statement is true about the relative number of gas particles in the two balloons

1. The He balloon has approximately half

the number of particles, since each particle is

only composed of 1 atom.
2. The He balloon has approximately half
the number of particles since each particle
has about twice the mass of H2
3. The H2 balloon has approximately half
the number of particles since each particle
has twice as many atoms.
4. Both balloons have approximately the
same number of gas particles.