Question

Any sample of pure water, irrespective of its source, contains 88.89% oxygen and 11.11 % hydrogen by mass. The data supports the:

• A. Law of conservation of mass
• B. Law of constant composition
• C. Law of multiple proportion
• D. Law of reciprocal proportion

Answer 1

Answer: (B)

Law of constant composition

The ratio of the mass of hydrogen to the mass of oxygen is

always 1:8, whatever the source of water.
$\frac{\text{mass of hydrogen}}{\text{mass of oxygen}}=\frac{11.11}{88.89}=1:8$
Hence the given data supports law of Constant proportion.