If 0.450 moles of iron iii oxide (fe2o3) are allowed to react with an excess of aluminum (al) and 43.6 grams of iron (fe) is produced, what is the percent yield of iron?
2al + fe2o3 2fe + al2o3

For the following, determine the type of reaction and then give products.

Asample of aluminum foil contains 8.60 × 1023 atoms. what is the mass of the foil?

Which statement explains why the bonds between non metals tend to be covalent? the bonds are found to be nondirectional they have large differences in electronegativity they have small differences in electronegativity they have ions that produce an electrostatic pull