- Avogadro's Number and Moles Exercise Sheet
||What are the units of molar mass?
||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?
||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?
||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?
||If there are 'x' atoms in 5 grams of carbon, how many atoms are
there in 5 grams of silicon?
||If 10 grams of iron contain 'y' atoms, how many grams of aluminum
will contain 'y' atoms.
||If 8 grams of oxygen contain 3.01 X 1023 atoms,
calculate the number of atoms present in 2 grams of oxygen.
||Using Avogadro's number, calculate the number of atoms in 0.005
kilograms of carbon.