Question

A student determines that the number of moles in a sample of Al2O3 is 8.3 moles. How many grams are in the sample?

Answer 1

Mass : 846.268 g

Further explanation

The mole is the number of particles contained in a substance

1 mol = 6.02.10²³

Moles can also be determined from the amount of substance mass and its molar mass

`\tt mol=(mass)/(MW)`

mass of Al₂O₃ :

MW 101,96 g/mol

mass=mole x MW

`\tt 8.3* 101.96=846.268~g`