How is atomic mass calculated? A. by adding the mass of the electrons and protons

B. by subtracting the mass of the protons from the mass number

C. by adding the mass of the protons and neutrons

D. by subtracting the mass of the neutrons from the mass number

some sources quote the lethal dose, for an average 170lbs opiate-naive individual is between 75 and 375 mg

because natural gas is colorless, odorless, and tasteless, distributors add mercaptan (a chemical that smells like sulfur) to give natural gas a distinct unpleasant odor (it smells like rotten eggs). they locate the types of rock that are likely to contain natural gas deposits.