Please help.

An excess of lithium oxide undergoes a synthesis reaction with water to produce lithium hydroxide li2o+h2o→2lioh if 1.05 g of water reacted, what is the theoretical yield of lithium hydroxide? a) 5.83 x 10–2 g lioh b) 1.17 x 10–1 g lioh c) 2.79 x 100 g lioh d) 1.40 x 100 g lioh

What is the empirical formula of c6h18o3? ch3o c2h5o c2h6o c2h5o5

Which of these expressions are correct variations of the combined gas law? p1v1t2 = p2v2t1 both