CHEM 23: Stoichiometric Calculations: The Workhorse of the Analyst Flashcards

the ratios in which chemicals react, from which we apply appropriate conversion factors to arrive at the desired calculated results

tells the number of particles in 1 mole (or mol) of a substance.

6.022x10²³

is the weight of a specified no. of atoms in that element

the sum of the atomic weights of the atoms that make up a compound

(1.0080)+(35.45) = 36.458 g/mol (insert surname)

sum of atomic weights but for ionic compounds

(22.990) + (12.011) + (1.0080) = 40 g/mol (insert surname)

the mass of one equivalent, that is the mass of a given substance which will combine with or displace a fixed quantity of another substance

is the ratio of the mass of a solute to the mass of the solution multiplied by 100 percent

1.61%

a unit of concentration used to express the amount of solute in a solution as a percentage of the volume of the solution.

4.11%

amount or sample of a chemical substance that contains as many constitutive particles as there are atoms in 12 grams = carbon – 12 (12g C-12 = 1mol)

one-molar solution is defined as one that contains one mole of substance in each liter of solution

one normal solution contains one equivalent per liter

for preparation of a smaller concentration

C₁V₁=C₂V₂

represents the number of parts of a substance per million parts of the solution

1240 ppm