How many moles of aluminum oxide (al2o3) are in a sample with a mass of 204.0 g?

You encounter a solution that is acidic and you decide to test it by adding a small amount of a strong acid. the ph lowers slightly but is approximately unchanged, and still remains acidic. what can you say about the solution? a. it is a buffer solution. b. it is not a buffer solution it is a strong acid solution. d. the solution has been neutralized. e. the solution has excess acid present

Asolution contains 180 g of glucose (c6h12o6) and 162 g of water. what is the mole fraction of glucose?

According to the vsepr theory what is the shape of a molecule that has a central atom valence three other items with no lone pairs of electrons