What does one mole of H2O correspond to?

Question

A.
6.02 × 1023 molecules of H2O
B.
6.02 × 1023 atoms of H and 6.02 X 1023 atoms of O
C.
6.02 × 1023 atoms of O
D.
6.02 × 1023 atoms of H
E.
6.02 × 1023 × 2 atoms of H

Answer 1

One mole of H2O corresponds to:

A. 6.02 × 10^23 molecules of H2O

This statement is correct because a mole, by definition in chemistry, is equal to Avogadro's number, which is approximately 6.02 × 10^23. Each mole of any substance contains this number of entities, be they molecules, atoms, or other particles.

Option B is partially correct in that one mole of H2O contains 6.02 × 10^23 molecules, each of which contains 2 hydrogen atoms and 1 oxygen atom. Thus, it will actually contain 6.02 × 10^23 × 2 = 1.204 × 10^24 atoms of H and 6.02 × 10^23 atoms of O. However, Option A is more straightforward and accurate since it directly states the correspondence to one mole of H2O.

So, the best answer directly related to one mole of water is:

A. 6.02 × 10^23 molecules of H2O.