Answer: About 6 percent.
- A About 12 percent
- B About 3 percent
- C About 6 percent
- D About 30 percent
Correct answer: C. About 6 percent
Explanation: Percentage strength (w/v) = volume strength / 5.6, so 20/5.6 is roughly 3.6, giving about 6% H<sub>2</sub>O<sub>2</sub> expressed as grams per 100 mL.
Each water molecule's O-H bonds (covalent, solid) can hydrogen-bond (dashed) to neighbouring molecules, forming an extended network responsible for water's unusually high boiling point and density anomaly.
Concept context
The simplest and most abundant element in the universe. Study its unique position in the periodic table, isotopes (protium, deuterium, tritium), properties of water and hydrogen peroxide, and industrial uses.