Calculate the mass of hydrogen formed when 25 g of aluminum reacts with excess hydrochloric acid. 2Al + 6HCl LaTeX: \longrightarrow⟶ 2 AlCl3 + 3 H2

At 300 mm hg, a gas has a volume of 380 l, what is the volume at standard pressure

How many mmols of tris-hcl are there in 100 ml of a 100 mm tris-hcl buffer solution at ph 8.1? note that the 100 mm refers to the sum of tris and tris-hcl concentrations?

How do you identify the anode on a power source such as a battery? how do you identify the cathode? how are terms anion and cation?