Black powder is made of 75% saltpeter (potassium nitrate; KNO3), 15% charcoal (carbon), and 10% sulfur. What is the mass of KNO3, Carbon, and Sulfur in a 150 gram sample of black powder?

Suppose you mix one mole of sulfuric acid (h2so4) with 1 mole of sodium hydroxide(naoh). why does the ph of the solution remain below 7? ( explain so i can get better understanding! )

Who examines and coordinates the cleanup of polluted sites?

Which statement best describes the liquid state of matter? a. it has definite shape but indefinite volume. b. it has definite shape and definite volume. c. it has indefinite shape and indefinite volume. d. it has indefinite shape but definite volume.