Question

Calculate the molar mass of aluminum oxide (Al2O3). Express your answer to four significant figures.

The molar mass of Al2O3 is ____ grams.

Answer 1

It is rounded to 102.0

Answer 2

Answer: 101.96 g

Explanation:- Molar mass is the mass of 1 mole of substance.

1 mole of
`Al_2O_3` contains 2 moles of Aluminium and 3 moles of Oxygen atom.

Thus mass of
`Al_2O_3` will be=
`2* {\text {mass of 1 mole of Aluminium}}+3* {\text {mass of 1 mole of oxygen atom}}`

Thus mass of
`Al_2O_3` will be
`=2moles* {26.98g/mol}+3moles* {16g/mol}=101.96g`