Unit 4: Molar Quantities

Question 1

Mole

Answer 1

a unit of chemical quantity used to express a number of ions

Question 2

First mole formula

Answer 2

=n/A

Question 3

Avogrados number

Answer 3

number of particles in a mole
6.022 x 10^23

Question 4

Converting between mass and moles

Answer 4

n=m/M

Question 5

percent compostion

Answer 5

% = (part/whole) x 100

Question 6

Emperical formula

Answer 6

molar ratio between elements which give us the subscripts for the emperical formula (reduced ratio of the chemical formula)

Question 7

proust’s law of definite proportions

Answer 7

a given chemical compound always contains its component elements in a fixed ratio, regardless of source of method or preparation

Question 8

Molecular formula

Answer 8

the actual number of atoms in one molecule of a compound

F = Mr/Memp

Question 9

Percentage error

Answer 9

a way for scientists to express how far off a lab result is form the commonly accepted value

% error = l (accepeted value - experimental value) /accepted value l x100

Question 10

Stoichiometry

Answer 10

used to determine chemical quantities in a reaction by using molar ratios