Question

A chemist needs 3 moles of aluminum oxide, Al2O3 for a particular experiment. How many grams of Al2O3 should she weigh out?

Answer 1

First, we need to know this:

1 mol of Al2O3 = 101.96 g (Use your periodic table to get the molar mass of this compound)

For this particular exercise, we have 3 moles of the oxide, and we want to know how many grams the 3 moles represent.

Procedure:

1 mol of Al2O3 ----------- 101.96 g of Al2O3

3 moles of Al2O3 ----------- X

X = 305.88 g of Al2O3 = 306 g of Al2O3

Answer: The chemist needs to weigh out 306 g of Al2O3