Calculate the mass of copper oxide 2 formed during the decomposition of 245 g of copper hydroxide 2

Explanation of the solution: to solve this problem, you first need to write the reaction equation, then you need to find the amount of copper (II) hydroxide substance (divide the mass of the hydroxide by its molar mass). The reaction equation shows that copper (II) hydroxide and copper (II) oxide are in a 1: 1 ratio, which means that the amount of copper (II) oxide substance is equal to the amount of copper (II) hydroxide substance. Now we multiply the received amount of oxide by its molar mass.