(a) Explain the reason for the fusion of organic compund with Na metal for the detection of elements

(a) Explain the reason for the fusion of organic compund with Na metal for the detection of elements.
(b) In sulphur estimation, 0-157 g of an organic compund gave 0-4813 g of BaS04. What is the % of Sulphur in the given oragnic compund ? (At mass of Ba = 137, S = 32,0 = 16)