Answer to Question #331609 in General Chemistry for emma

Question

A sample of bauxite ore contains 7.71 x 1024 molecules of aluminum

oxide, Al20g. How many moles of aluminum oxide are in the sample?

Answer 1

Solution:

One mole of any substance contains 6.02×10²³ atoms/molecules

Therefore,

Moles of Al₂O₃ = (7.71×10²⁴ molecules) × (1 mol / 6.02×10²³ molecules) = 12.8 mol Al₂O₃

Moles of Al₂O₃ = 12.8 mol

Answer: There are 12.8 moles of aluminum oxide (Al₂O₃) in the sample