Question

You can use mole ratios and molar mass to determine the masses of substances involved in a chemical reaction. Using the periodic table, calculate the molar masses of iron oxide (Fe2O3) and aluminum oxide (Al2O3). Give your answer to four significant figures.

Molar mass of Fe2O3 =
g/mol

Answer 1

Answer: Molar mass of the is 159.7 g/mol.

The molar mass of this is 101.96 g/mol.

The molar masses of Fe2O3 and Al2O3 are 160.0 g/mol and 102.0 g/mol, respectively.

Molar mass

The molar mass of a compound is the sum of the molar weights of the individual atoms that make up the compound.

In this case, the molar weight of Fe is 56, O is 16, and Al is 27 g/mol, respectively.

Fe2O3 = (56x2) + (16x3)

= 160.0 g/mol

Al2O3 = (27x2) + (16x3)

= 102.0 g/mol