Chemical Quantities
Chapter 10
10.1 The Mole
A Measurement of Matter
Measuring Matter
Buy milk in what quantity?
Purchase fabric by the ….?
Pick apples by the ….?
Measuring Matter
Chemistry measures matter by…
mass
volume
atoms
MOLES
the MOLE
a unit used to specify a number of particles
6.02 x 1023 representative particles = 1 mole of these
particle
representative particles are determined by the
substance: atoms, molecules, or formula units
the MOLE
conversions between particles and moles requires the
use of Avogadro’s number
6.02 x 1023
What is the mass of 90 apples if 1
dozen apples has a mass of 2.0kg?
the Mass of Mole
atomic mass is expressed in amu (atomic mass units)
1 amu = mass of 1 proton or 1 neutron
given as the average of different isotopes of an
element
the Mass of a Mole
atomic mass expressed in GRAMS is the mass of 1 mole
of an element
1 mole He = 4.00260g
Molar Mass of He = 4.00260 g/mol
What is the molar mass of PCl3?
How many atoms are in 1 mole of
PCl3?
-write the electron dot structure of this compound
-name this compound
Propane is a gas used for
cooking and heating. How
many atoms are in 2.12 mol of
propane (C3H6)?