The chemical compound derived from Li2O reacting with H2O is LiOH. Li2O is the chemical formula for lithium oxide, H2O is the chemical formula for water, and LiOH is the chemical formula for lithium hydroxide.
When written out, the balanced equation for the reaction reads as Li2O + H2O = 2 LiOH, according to WebQC. Li is the chemical symbol for lithium, H is the chemical symbol for hydrogen, and O is the chemical symbol for oxygen. The number in front of the compound indicates the number of compounds produced. The numbers after the element symbols indicate the number of atoms of each element present.