|Avogadro's Number and Moles Exercise Sheet
|1.||What are the units of molar mass?
|2.||The mass of 2.5 X 104 grapes is 50 kilograms, and
that of an equal number of oranges is
1.2 X 103 kg. What is the mass ratio of a single single grape to a single orange?
|3.||A mole of carbon atoms has a mass of 12 grams, and a mole of
magnesium atoms, 24
grams. What is the mass ratio of a single carbon atom to a single magnesium atom?
|4.||Aluminum and oxygen combine in a mass ratio of 9.00 to 8.00.
If a flashbulb contains
5.4 X 10-3 grams of aluminum, what mass of oxygen must be present for complete combustion of the aluminum?
|5.||If there are 'x' atoms in 5 grams of carbon, how many atoms
are there in 5 grams of silicon?
|6.||If 10 grams of iron contain 'y' atoms, how many grams of aluminum
will contain 'y' atoms.
|7.||If 8 grams of oxygen contain 3.01 X 1023 atoms,
calculate the number of atoms present in 2 grams of oxygen.
|8.||Using Avogadro's number, calculate the number of atoms in 0.005
kilograms of carbon.