Calcium Oxide Reacts with Water in a Combination Reaction to Produce

Calcium oxide reacts with water in a combination reaction to produce calcium hydroxide: CaO(s) + O(l) → (s)
A 4.50 g sample of CaO is reacted with 4.34 g of O. How many grams of water remain after the reaction is complete?

A) 0.161 g
B) 0.00893 g
C) 1.45 g
D) 0.241 g
E) 2.89 g