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The rule that a pure compound always holds the same elements in the same proportion by mass is the law of:
ADelayed proportions
BDefinite proportions
CDivided proportions
DDoubled proportions
Answer & Solution
Correct answer: B. Definite proportions
1. Proust demonstrated it with careful analysis.
2. The proportion never varies between samples.
3. That rule is the law of definite proportions.
_Source: OpenStax Chemistry 2e, Chapter 2, Atoms, Molecules, and Ions._
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