Answer:
6 moles of oxygen, or 3O2.
Explanation:
I would build a proportion for this:

27.6 - 22.3 = 5.3; you simply subtract the old density from the new density.
Answer:
light with a high enough intensity
Explanation:
Noble gases react very unwillingly, because the outermost shell of electrons orbiting the nucleus is full, giving these gases no incentive to swap electrons with other elements. As a result, there are very few compounds made with noble gases. Like its noble gas comrades, neon is odorless and colorless.