Mole, Molar Mass, Ionic Compounds

Front

What is the molar mass of Al2O3?

Back

The molar mass of Al2O3 is 102 grams/mole.

Front

How do you calculate the mass of a substance given its moles and molar mass?

Back

Mass = Moles x Molar Mass.

Front

What is the mass of 3 moles of Al2O3?

Back

The mass of 3 moles of Al2O3 is 306 grams.

Front

What is the definition of molar mass?

Back

Molar mass is the mass (in grams) of one mole of a substance.

Front

Which has more atoms: 1 mole of Al2O3 or 1 mole of NaCl?

Back

Both have equal amounts of atoms, as they both contain 6.02 x 10^23 formula units.

Front

What is the balanced chemical equation for the synthesis of lithium nitride?

Back

6 Li (s) + N2 (g) --> 2 Li3N (s) is the balanced equation.

Front

What is Avogadro's number?

Back

Avogadro's number is 6.02 x 10^23, which is the number of atoms or molecules in one mole.

Front

How many grams are in 6.02 x 10^23 atoms of sulfur (S)?

Back

The mass of 6.02 x 10^23 atoms of sulfur is the molar mass of sulfur, which is approximately 32 grams.

Front

What is the relationship between moles and molecules?

Back

1 mole of any substance contains 6.02 x 10^23 molecules or atoms.

Front

How do you determine the number of moles from a given mass?

Back

Number of moles = Mass (grams) / Molar Mass (grams/mole).