Chapter Six Reading

Question 1

Molecular Weight-for molecules

Answer 1

The sum of atomic weights of the atoms in a molecule.

Question 2

Formula Weight-for ionic compounds

Answer 2

The sum of the atomic weights of the atoms in one formula unit of any compound, whether molecular or ionic.

Question 3

Mole (mol)

Answer 3

The amount of substance whose mass in grams is numerically equal to its molecular or formula weight

Question 4

Molar Mass

Answer 4

The mass in grams of one mole of a substance, numerically equal to the molecular weight.(equal to the amu weight)

Question 5

Avogadro’s number (NA)

Answer 5

The number of units in 1 mole of anything; 6.02 x 10^23

Question 6

Limiting reagent

Answer 6

The reactant that runs out first in a chemical reaction.

Question 7

Theoretical yield

Answer 7

The amount of product formed assuming complete reaction of the limiting reagent. (once all of the limiting reagent is completely consumed)-found by mass to mass calculation

Question 8

Actual Yield

Answer 8

The amount of product that is actually formed in a reaction. (some of the product may be lost in handling)-found by weighting the product

Question 9

Percent yield

Answer 9

The percentage of the theoretical yield actually obtained from a chemical reaction.
Percent Yield = (Actual Yield)/ (Theoretical Yield)