To calculate the atomic mass of copper (II) hydroxide, Cu(OH)2, we need to sum up the atomic masses of all the atoms in the compound.
The atomic mass of copper (Cu) is approximately 63.55 grams per mole (g/mol). Oxygen (O) has an atomic mass of about 16.00 g/mol, and hydrogen (H) has an atomic mass of approximately 1.01 g/mol.
In Cu(OH)2, there is one copper atom, two hydroxide (OH-) groups, and two oxygen atoms within each hydroxide group.
The formula for the atomic mass of copper (II) hydroxide can be calculated as follows:
Atomic mass = (Atomic mass of Cu) + 2 * (Atomic mass of O) + 2 * [(Atomic mass of H) + (Atomic mass of O)]
Atomic mass = 63.55 g/mol + 2 * 16.00 g/mol + 2 * [(1.01 g/mol) + (16.00 g/mol)]
Performing the calculations, we get:
Atomic mass = 63.55 g/mol + 2 * 16.00 g/mol + 2 * 17.01 g/mol Atomic mass = 63.55 g/mol + 32.00 g/mol + 34.02 g/mol Atomic mass = 129.57 g/mol
Therefore, the atomic mass of copper (II) hydroxide, Cu(OH)2, is approximately 129.57 grams per mole.