Question

write the balanced chemical equation for the reaction described lithium metal is burnt in air

Answer 1

When lithium is burnt in air,the main product is white lithium oxide.
 the balanced equation:
                                    4Li(s)+O2(g)-------->2Li   O(s)
                                                                     2 

Answer 2

when lithium is burnt in air 
2Li+O gives Li2O