HELP- Mara adds 4 tablespoons of water to the sand, 7 tablespoons to the gravel, and 5 tablespoons to the
Calculate the porosity of each of Mara's samples using this formula, and record the results in the char
% porosity = (amount of water added to sample = total sample volume) x 100
"Total sample volume" is the amount of soil, sand, or gravel. A half cup is equal to 8 tablespoons.

Ineed to find the answer of this question because i dont understand it

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

How many grams of phosphorus are contained in 5.09 moles of phosphorus?