3.1, 3.2, 3.3, 3.4

Question 1

define a mole

Answer 1

a mole is the amount of a substance that contains the same number of entities (atoms, molecules, or other particles) as the number of atoms in 12g of C-12

Question 2

Avogadro’s number

Answer 2

1 mole contains 6.022 x 10^23 entities

Question 3

define molar mass

Answer 3

the mass of a mole of its entities (atoms, molecules, or formula units) and has units of g/mol

Question 4

converting between mass, amount, and molar mass

Answer 4

mol = mass/Mr

Question 5

converting between amount and number of entities

Answer 5

mol = no. of entities/Na

Question 6

mass % of element X

Answer 6

moles of X in formula x molar mass of X / mass (g) of 1 mol of compound
x100

Question 7

empirical formula

Answer 7

lowest whole number of moles, thus the relative number of atoms, of each element in the compound

Question 8

molecular formula

Answer 8

actual number of atoms of each element of each element in a molecule

Question 9

structural formula

Answer 9

relative placement and connections of atoms in the molecule

Question 10

whole number multiple

Answer 10

divide the experimentally determined molar mass by the molar mass of the empirical formula

Question 11

% yield

Answer 11

actual yield/theoretical yield x 100

Question 12

theoretical yield

Answer 12

amount of product calculated from the molar ratio in the balanced equation.

Question 13

actual yield

Answer 13

amount of product actually obtained experimentally