Question

this is a model of a water molecule. element mass (u) hydrogen 1 oxygen 16 which evidence can be used to determine that this is an accurate model of a water molecule? a. all pure water samples include half the mass of hydrogen than they do of oxygen. b. all pure water samples include twice the mass of hydrogen than they do of oxygen. c. all pure water samples include eight times the mass of oxygen than they do of hydrogen. d. all pure water samples include sixteen times the mass of oxygen than they do of hydrogen.

Explanation:

The chemical formula of water is H₂O. Each water molecule has 2 hydrogen atoms and 1 oxygen atom. The atomic mass of hydrogen is 1 u and that of oxygen is 16 u. So the mass ratio of oxygen to hydrogen in water is 16:(1×2) = 8:1, meaning pure water samples have eight - times the mass of oxygen than hydrogen.

Answer:

C. All pure water samples include eight times the mass of oxygen than they do of hydrogen.