In basic chemistry, which option correctly states the molecular composition of water (H2O)?

Introduction:
Knowing the composition of common compounds is foundational. Water, central to environmental and hydrologic processes, has a well-known molecular formula that determines many of its unique physical properties.

Given Data / Assumptions:

• We must map the formula H2O to a plain-English atom count.
• No ionized or radical forms are implied.

Concept / Approach:
In a chemical formula, subscripts denote atom counts in a single molecule. Thus H2O indicates 2 hydrogen (H) atoms bonded to 1 oxygen (O) atom via polar covalent bonds, enabling hydrogen bonding among molecules.

Step-by-Step Solution:
Read H2O → two H atoms, one O atom.Translate to words: two hydrogens and one oxygen.Select the option that states this composition verbatim.

Verification / Alternative check:
Molar mass check: 2*1 + 16 = 18 g/mol matches tabulated water data.

Why Other Options Are Wrong:

• HO, HO2, H3O2, H2O3 represent different (often unstable or different) species, not water.

Common Pitfalls:

• Confusing water (H2O) with hydrogen peroxide (H2O2).

Final Answer:
Two hydrogen atoms and one oxygen atom.