Station 1:
What volume does 1.5 moles of distilled H2O take up? Use
the materials provided to help you answer the question.
Extra time? What is a mole’s favorite movie?
Station 2:
Ethanol, CH3CH2OH, has a density of 0.789 g/mL. If you
have 25.0 mL of ethanol, how many moles of ethanol do
you have? How many molecules? How many hydrogen
atoms?
Extra time? What did Avogadro teach his students in math
class?
Station 3:
Calculate the empirical formula for the following:
a) carbon = 15.8%; sulfur = 84.2%
b) silver = 70.1%; nitrogen = 9.1%; oxygen = 20.8%
Extra time? Avogadro loved to watch MASH. Who was his
favourite character?
Station 4:
Determine the molecular formula for each compound below
from the information listed.
Substance
Octane
Ethanol
Naphthalene
Melamine
Empirical Formula
C4H9
C2H6O
C5H4
CH2N2
Molar Mass (g/mol)
114
46
128
126
Extra time? Why are moles bad at counting?
Station 5:
Calculate the percentage composition of each
substance: a) SiH4, b) FeSO4
c) NaHCO3
Extra time? Why are moles always eating?
Station 6:
How many formula units of sodium chloride are there in the
weighing boat? The weighing boat has a mass of __________
g.
Extra time? What kind of fruit did Avogadro eat in the
summer?
Station 1:
What volume does 1.5 moles of distilled H2O take up? Use
the materials provided to help you answer the question.
= 27.03 g = 27.03 mL (Measure, or use density of water:
1g/mL)
Extra time? What is a mole’s favorite movie?
A Green Mole!
Station 2:
Ethanol, CH3CH2OH, has a density of 0.789 g/mL. If you
have 25.0 mL of ethanol, how many moles of ethanol do
you have? How many molecules? How many hydrogen
atoms?
Mass of ethanol = 0.789 g/mL x 25.0 mL = 19.725g
Moles of ethanol = 19.725g x 1 mol/46.08 g= 0.428 mol
Molecules = 0.428 mol CH3CH2OH x 6.02 x 1023
molecules/mol
H atoms= 2.576 x 1023 molecules ethanol x 6 H atoms/1
Molecule
24
= 1.546 x 10 H atoms
Extra time? What did Avogadro teach his students in math
class?
Moletiplication
Station 3:
Calculate the empirical formula for the following:
a) carbon
Element
C
S
EF = CS2
= 15.8%;
%
15.8
84.2
sulfur = 84.2%
mass
M
15.8
12.01
84.2
32.07
moles
ratio
1.31557 1
2.62551 2
b) silver = 70.1%; nitrogen = 9.1%; oxygen = 20.8%
Element %
mass
M
moles
ratio
Ag
70.1
70.1
107.87 0.64986 1
N
9.1
9.1
14.01
0.64954 1
O
20.8
20.8
16.00
1.3
2
EF = AgNO2
Extra time? Avogadro loved to watch MASH. Who was his
favourite character?
Father Molecahy
Station 4:
Determine the molecular formula for each compound below
from the information listed.
Substance
Empirical Formula
Octane
Ethanol
Naphthalene
Melamine
C4H9
C2H6O
C5H4
CH2N2
Molar Mass
(g/mol)
114
46
128
126
Octane: 114 g/mol / 57.13 = 2
Octane = C8H18
Ethanol: 46 g/mol / 46.08 g/mol = 1
Ethanol = C2H6O
Naphthalene: 128 g/mol / 64.09 g/mol = 2
Naphthalene = C10H8
Melamine: 126 g/mol / 42.05 g/mol = 3
Melamine: C3H6N6
Extra time? Why are moles bad at counting?
They only know one number!
Station 5:
Calculate the percentage composition of each
substance: a) SiH4, b) FeSO4
c) NaHCO3
SiH4:
MSiH4 = 28.09 g/mol + 4.04 g/mol = 32.13 g/mol
%Si = 28.09 g/mol / 32.14 g/mol * 100 = 87.42%
%H = 4.04 g/mol / 32.14 g/mol * 100 = 12.57%
FeSO4:
MFeSO4 = 151.92 g/mol
%Fe = 55.85g/mol / 151.92g/mol * 100 = 36.76%
%S = 32.07g/mol / 151.92 g/mol * 100 = 21.11%
%O = 64.00g/mol / 151.92 g/mol * 100 = 42.13%
NaHCO3:
MNaHCO3 = 84.01g/mol
%Na = 22.99g/mol / 84.01g/mol * 100 = 27.37%
%H = 1.01g/mol / 84.01g/mol * 100 = 1.20%
%C = 12.01g/mol /84.01 g/mol * 100 = 14.30%
%O = 48.00g/mol / 84.01g/mol * 100 = 57.14%
Extra time? Why are moles always eating?
Because they’re molenourished!
Station 6:
How many formula units of sodium chloride are there in the
weighing boat? The weighing boat has a mass of __________
g.
= 5 g x 1mol/58.44 g/mol = 0.0856 mol * 6.02x1023 F.U./
mol
22
= 5.15 x 10 formula units
Extra time? What kind of fruit did Avogadro eat in the
summer? Watermolens