Question

In class, students were given the following problem: "Aluminum satellite dishes resist corrosion because aluminum reacts with oxygen gas to form a coating of aluminum oxide (Al2O3). What is the mass of Al2O3?"
a) Sally solved the problem by first finding the molar mass of aluminum oxide. She calculated the molar mass of Al2O3 as 43.0 g/mol. This is not the correct molar mass however. What did sally do wrong?

b) After finding the molar mass of Al2O3, Jacob set up the following conversion. (I'll add a pic)

Is this the correct set up for the problem?

Answer 1

Hello! 

the correct setup is shown at bottom of your question

we get

total moles*(1/102.0 g/mol)= total grams Al2O3

hope this helps. any questions please ask. thank you kindly