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.

Determine the empirical formula of a compound containing 40.6 grams of carbon, 5.1 grams of hydrogen, and 54.2 grams of oxygen. in an experiment, the molar mass of the compound was determined to be 118.084 g/mol. what is the molecular formula of the compound? for both questions, show your work or explain how you determined the formulas by giving specific values used in calculations.

One mole of zinc has a mass of 65.4 grams. approximately how many atoms of zinc are present in one mole of zinc? 32 × 1023 atoms 6 × 1023 atoms 66 atoms 65 atoms

Why are pipes bursting in the in extremely cold weather?