Unit 3: Lesson 2

Question 1

Molar Mass

Answer 1

Mass in grams of 1 mole of a substance (g/mol)

Question 2

Percent Composition

Answer 2

=(Total mass/element Mass) x 100%
Percent of elements within a substance

Question 3

Empirical Formula

Answer 3

Simplest whole-number ratio of the amount of atoms assigned to each element in a substance.
%comp—g—mol—mol/smallest mol value

Question 4

Molecular Formula

Answer 4

Gives the actual number of each atom present in a molecule.
Empirical/Molar mass = Y empirical subscripts x Y