1. How many moles of nitrogen gas are in 1.54x10^26 molecules? How many atoms? 2. How many molecules of water are in 3.45 moles of water?
3. How many atoms of C are in 2.00 moles of Cv6Hv12Ov6? (v means the number is below)

Determine the wavelength of the light absorbed when an electron in a hydrogen atom makes a transition from an orbital in the n=3 level to an orbital in the n=7 level.

Butadiene undergoes a reaction at a certain temperature in the gas phase as follows: 2c4h6(g) --> c8h12(g) the following data were collected for this reaction: time (min) [c4h6] (m) 0 0.36 15 0.30 30 0.25 48 0.19 75 0. determine the order of the reaction and the rate constant. 1st order and k = 4.3x10 -4 s-1 1st order and k = 2.3x10-4 s-1 2nd order and k = 4.3x10-4 s-1 2nd order and k = 2.3x10-4 s-1 zero and k = 4.3x10-4 s-1

12. calculate the hydroxide ion concentration of a solution with ph = 3.25. show all calculations leading to an answer