How many grams are in 1.02 x 1022 molecules of nitric acid?

What is the concentration in ppm of a 3.7 L solution (d = 1.00 g/mL) containing 4.21 x 10-7 kg of the pesticide DDT? 

The percent composition by mass of an unknown chlorinated hydrocarbon was found to be 37.83% C, 6.35% H, and 55.83% Cl by mass. What is the empirical formula of this compound?

pH is the measurement of

Calculate the molality of a solution containing 14.3 g of NaCl in 42.2 g of water.

How many electrons are there in the 2nd principal energy level (n = 2) of a phosphorus atom?

  Organic cofactors are referred to as:

Increases metabolic rate  

Decreases heart rate

CN V (Cranial Nerve V) is popularly known as the ___________    ______