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The molecular mass of a substance is the sum of the atomic masses of all the atoms present in a molecule of that substance.
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Stoichiometry is founded on the law of conservation of mass where the total mass of the reactants equals the total mass of the products leading to the insight that the relations among quantities of reactants and products typically form a ratio of positive integers.
A mole is a 
1.  6.02*10 to the power of 23.
2. the formula in grams of a substance contains one mole of particles.
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