Ch.  6   moles                          test [50 points]                                                Chemistry       

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. solve  [15 points]

a.  0.00150 micromole sulfur dioxide = __ g sulfur dioxide

b.  1.05 * 10 20 C8H10N4O2 (caffeine)  molecules =  ___ mg caffeine

c.  0.0666 nanomole C3H8  =  __ C3H8 molecules


2. Determine the empirical formula of the compound based on the following information:  

1.0 g CxHyOz  +  excess O2  →  2.2 g CO2  +  1.2 g H2O.    [20 points]

3. Determine the empirical formula of a compound containing   [15 points]

48.65 % carbon
8.11 % hydrogen
43.24 % oxygen