you have 155-g sample of Al2O3. If there are 22.5 g of Al in the solution, ehat is the percent by mass of the solution

Which of the following is true for the actual yield of a reaction? it is always calculated as a ratio. it is the yield from the excess reactant. it is the yield from the limiting reactant. it is always less than the theoretical yield.

Transportation is the largest single source of air pollution in the united states. air pollution can harm the environment and human health. which technology could offer a solution to this problem? mufflers that reduce noise motors that run on electricity tires that improve gas mileage

Identify the electromagnets with poles that are reversed from the electromagnet shown above