If water samples are taken from a sea, river, cloud, lake, or snow, they will be found to contain hydrogen and oxygen in the ratio of 1:8 by weight. This indicates the law of:
Correct answer: A. Definite proportion
- A. Definite proportion
- B. Multiple proportion
- C. Reciprocal proportion
- D. None of above
Explanation
The law of constant composition states that a given chemical compound always contains its component elements in fixed ratio (by mass) and does not depend on its source or method of preparation. A sample of H₂O from any source will have hydrogen and oxygen in a ratio of 1:8 by mass. (Mass ratio in H2O = 2:16 = 1:8).
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About Moles and Avogadro's Number
The mole connects the microscopic number of particles with measurable mass, using Avogadro's number, 6.022 × 10²³ particles per mole. Questions involve molar mass, conversion between mass, moles and particles, percentage composition, empirical and molecular formulas, and distinguishing atoms, molecules, ions and formula units.
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