How many molecules are in 3.9 moles of water?
a. 2.3 x 1024 molecules of water
b. 6.5 x10-24 molecules of water
c. 71 molecules of water
d. 22 molecules of water

What happens when light is scattered?

In the millikan oil drop experiment they determined that every drop had a charge which was a while number multiple of -1.60x10^-19. if a drop has a total charge of -9.60x10^-19 then how many excess electrons are contained within the drop?

4.25g sample of solid ammonium nitrate dissolves in 60.0g of water in a coffee-cup calorimeter, the temperature drops from 22.0 c to 16.9 c. assume that the specific heat of the solution is the same as that of pure water. calculate delta(h) (in kj/mol nh4no3) for the solution proces.