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Answer the following questions:
  
1. Which postulate of Dalton’s atomic theory can explain the law of definite proportions?
 
The postulates of Dalton's atomic theory that can explain the law of definite proportions is - the and kinds of are equal in given compounds.
 
2. Define the atomic mass unit.
 
One atomic mass unit is equal to precisely the mass of one atom of carbon-12. The relative atomic masses of all  have been found concerning an atom of carbon-12.