Question

1. Carbon(II) oxide was passed over 4.1g of heated oxide of copper in a combustion tube until there was no further change. The mass of the final substance was found to be 3.29g
   Complete the Table and determine the empirical formula of the oxide.
   (Cu=64.0; O=16.0)

   Element	Cu	O
   Mass (g)
   Number of Moles

   Empirical formula         
2.    State the property of carbon(II) oxide that was demonstrated in the experiment.         

Answer 1

1.    Table

   Element	Cu	O
   Mass (g)	3.29	0.81
   Number of Moles	3.29     64 =0.051	0.81     16 =0.051
   Mole ratio	1	1

   Empirical formula        CuO     
2. Reducing agent/Reducing property.