THE MOLE: LAB ACTIVITY
Station 1:
A) Determine the mass of one drop of water by measuring the mass of 50 drops of water.
Mass of dish (or beaker)
Mass of dish (or beaker) + 50 drops water
Mass of 50 drops water
Mass of 1 drop of water
= ________ g
= ________ g
= ________ g
= ________ g
B) How many molecules are there in one drop of water?
Remember 1 mole of a substance is 6.02 x 1023 particles (atoms or molecules).
Therefore, 6.02 x 1023 molecules of water will weigh 18.02 g/mol
1. Find # of moles of water for 1 drop
n = (mass)/(Molar Mass)
2. # of molecules in one drop of water
= nwater x 6.02 x 1023 molecules
1 mole
= ? molecules
Station 2
Calculate the number of copper atoms in a penny.
1. Find # of moles of Cu
n = (mass)/(Molar Mass)
2. # of Cu atoms in a penny = nCu x 6.02 x 1023 atoms
1 mole
= ? atoms
Station 3
A. Calculate the number of moles in one spoon of sugar. Assume that sugar is made up entirely
of sucrose molecules (C12H22O11).
Msucrose = 342.34 g/mol
nsugar = msucrose
Msucrose
= ______ mol
B. Calculate the number of molecules of sugar in one spoon of sugar.
# of molecules sucrose
= nsucrose x 6.02 x 1023 molecules
1 mol
= _______ mol x 6.02 x 1023 molecules
1 mole
= ? molecules
Station 4
Measure the mass of a piece of chalk. Use the piece of chalk to write your full name on the
sidewalk or an unused blackboard. Measure the mass of the chalk again. Calculate the number of
molecules that you used to write your name. Assume that chalk is made up of calcium carbonate
(CaCO3).
Mass of chalk before
Mass of chalk after
Mass of chalk used to write name
= ________ g
= ________ g
= ________ g
Mchalk = 100.09 g/mol
# molecules of chalk
to write name
= nChalk x 6.02 x 1023 molecules
1 mole
= massChalk x 6.02 x 1023 molecules
MChalk
1 mole
= massCu
x 6.02 x 1023 molecules
100.09 g/mol
1 mole
= ? molecules
Station 5
Calculate the number of iron atoms in an iron nail.
1. Find # moles of Fe
n = (mass)/(Molar mass)
2. # of Fe atoms in a nail
= nFe x 6.02 x 1023 atoms
1 mole
= ? atoms