1. Ratios The MOLE concept Counting by massing C-12 TMF
Chapter 7 Honors Chemistry
The MOLE concept
◄◄So you can work with
In this chapter you must be able to:
______________ and ______________
Rationale
Write formulas
Application
Name compounds**
**including acids!
Molar Mass
6.02 x 1023 particles
1 mole of particles
Counting by massing
Ratios
Expressed in grams
Periodic Table for Info
A reflection of
Mass Spec.
Rel. Atomic Mass
…the law of definite composition
Elements
Compounds
Angles of refection relative to
( )
mass
( )
moles
Dimensional Analysis
% Comp.
Emp. Form.
C-12
need MM
Molecules
TMF
F.U.’s

2. 20.0 grams of a substance with the following % composition:
23.1% Fe, 17.4 % N, 59.6 % O
(0.414 mol)
(1.24 mol)
(3.75 mol)
◄ In a g sample
FeN3O9 … but 1 3 9
Find the formula:
Type of Substance:
Name of this solid:
Particle type of this solid:
# of particles of this sample:
# of moles of particles of this sample:
Fe(NO3)3
Ionic
iron (III) nitrate
F.U.’s
4.98 x 1022 F.U.’s
moles of F.U.’s

3. 0.90 moles of N2O4 gas are captured in a balloon.
What is the empirical formula for this molecular substance?
Type of Substance:
Name of this gas:
Particle type of this gas:
# of particles of this sample:
Mass of this sample:
Molecular
dinitrogen tetroxide
NO2
molecules
5.4 x 1023 molecules
83 g