Cu(OH)2 is Copper Hydroxide Copper Oxide is: CuO Water is: H2O So you just set these up in the order it tells you to: Cu(OH)2 ------>> CuO + H2O To balance, you need the same amount of elements on both sides. They already match up so this your final answer: 1Cu(OH)2 ------>> 1CuO + 1H2O