A 0.738 g оf sоdium wаs cоmpletely burnt in presence of oxygen аnd received а product with a mass of 0.9946 g. Using the information given below, calculate the number of moles of oxygen in the product. 2Na(s) + O2(g) --> 2Na2O(s) (Na = 23.0 g/mol, O = 16.0 g/mol)