Why metals are denser than non - metals ?

How many moles of al3+ ions are in 1.25 moles of al2o3

How does a catalyst increase the speed of a reaction? a. the catalyst eliminates the activated complex stage, allowing products to form immediately. b. the catalyst lowers the energy level of the reactants, making it easier for them to react. c. the catalyst makes it easier for the activated complex to form, lowering the activation energy. d. the catalyst raises the energy level of the products, making the reaction finish sooner. reset next

Calculate the percent composition by mass of each element in al(oh)3. use at least three significant figures.