How many atoms of each element are in this chemical formula?
A. 1 nitrogen, 1 hydrogen, and 3 oxygen
B. 2 nitrogen, 4 hydrogen, and 3 oxygen
C. 5 nitrogen, 1 hydrogen, and 1 oxygen

How many moles of gas are present if p=11 atm, v=12l, t=185k?

Which liquid (h2o, h2o + soap, or h2o + salt) has the strongest cohesion and adhesion? (need now plz)

Ablock of aluminum is dropped into a graduated cylinder with an initial volume of water at 75ml and the volumes rises to 90ml. if the block has a mass of 40.5 g what is its density ?