If an unknown containing an inorganic ion did not have a definite composition, how could a weighable form of organic precipitate be produced

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

If anyone would be able to me out with these three questions it would be these are from the chem 2202 course.

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