Ch.  11 & 6 light & moles                    test [70 points]

Show your work in an organized manner, include (i) any relevant equation (or formula), (ii) conversion factor(s), (iii) put the proper units in your calculations and answer, and (iv) have the proper number of significant figures in your answer. 

1. In regards to light,  [20 points]

 a. What is the energy of light if it has a frequency of 3.5 MHz ?

b.  What is the wavelength of light if it has an energy of 2.5 * 10 -19 Joules ?

2. In regards to the line spectrum in a hypothetical atom, where the atom emits (or absorbs) blue and green light, describe the basis of the ___ spectrum with respect to the electron energy level in the atom.  Clearly identify the transition for blue versus green light.  [20 points]

a.  Emission                                                               b. absorbance

3.  solve  [30 points]

a.  0.00850 mole sulfur dioxide = __ g

b.  8.05 * 10 18 C8H10N4O2 (caffeine)  =  ___ g

c.  0.0888 mole C3H8  =  __ C3H8 molecules