Chapter 9- The Mole

 1. Mole: the unit of amount of substance in chemistry, its symbol is mol.  2. Stoichiometry: the relationship between the number of moles of reactant and the number of moles of products in the same chemical reaction.  3. Relative Atomic Mass: the mass of one atom of an element compared to 1/12th of the mass of one Carbon-12 atom.  4. Relative Molecular Mass: the mass of one molecule of an element/compound compared to 1/12th of the mass of one Carbon-12 atom.  5. Relative Formula Mass: the molecular mass for ionic compounds.  6. Avagadro’s number/constant: one mole of any substance contains 6x1023 particles.  7. Empirical Formula: the simplest ratio of atoms or elements present in a compound.  8. Molecular Formula: shows the number of atoms of each element in a compound.  9. Molar Mass: Mass of 1 mole of a substance.

10. Molar Volume: Volume occupied by 1 mole of gas. At r.t.p, one mole of any gas occupies 24 dm3.
11. Concentration: Amount of solute dissolved per unit volume of the solution.
12. Yield: the amount of product formed in a reaction.
13. Theoretical yield: the calculated amount of product that would be obtained if the reaction would be complete with no external factors acting upon it.
14. Actual yield: the amount of product formed in a reaction..
15. Percentage yield: the relationship between the actual and theoretical yield.
16. Percentage purity: the percentage of the mass of pure substance upon mass of the whole sample.
17. Limiting reactant: the reactant that determines the amount of product formed because of having fewer moles.
18. Excess reactant: the leftover reactant after the reaction has stopped.

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