23. Why is the Sun's composition similar to that of the gas giant planets
A. They all formed at the same time
B. They both lost heavy elements
C. They all formed from the same interstellar cloud.
D. They both gained heavy elements​

This question is Graham’s law. It states that one molecule will diffuse X times faster than another molecule, where x = square root (high atomic mass / low atomic mass). If you plug in hydrogen and helium’s masses, it’s root(4/1), or 2. That means hydrogen is twice as fast a helium, so helium will take 32 hours