Problem: When a log burns, the mass of its products equals the mass of the log and oxygen. This is an example of which law? A. Law of Definite Proportions B. Law of Conservation of Mass C. Law of Multiple Proportions D. Law of Modern Atomic Theory E. First Law of Thermodynamics 

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When a log burns, the mass of its products equals the mass of the log and oxygen. This is an example of which law?

A. Law of Definite Proportions

B. Law of Conservation of Mass

C. Law of Multiple Proportions

D. Law of Modern Atomic Theory

E. First Law of Thermodynamics