Stoichiometry
Mass number of an atom is the sum of the numbers of

Protons and electrons
Neutrons and protons
Both A & B
Neutrons and electrons

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Stoichiometry
In a binary liquid solution of components A and B, if component A exhibits positive deviation from Raoult's law, then component B

Exhibits positive deviation from Raoult's law
Exhibits negative deviation from Raoult's law
May exhibit either positive or negative deviation from Raoult's law
Obeys Raoult's law

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