Which one has higher mass and why 2g of hydrogen or 6.023x10²¹ molecules of oxygen?

The minerals found in bones are deposited by living cells called

What type of electromagnetic waves does the human eye see as the colors red blue or green a visible light waves b radio waves c infrared waves d microwaves

Identify the correct mole ratio for each substance. sodium chloride (nacl) na: cl = 1: ammonium nitrate (nhno) h: o = 4: