To calculate the mass of a mole of calcium hydroxide, Ca(OH)₂, we need to determine the molar mass by adding the atomic masses of each element in the compound.
Calcium (Ca) has an atomic mass of approximately 40.08 g/mol, hydrogen (H) is about 1.01 g/mol, and oxygen (O) is around 16.00 g/mol.
In Ca(OH)₂, we have one calcium atom, two oxygen atoms, and two hydrogen atoms. Therefore, the calculation for the molar mass is as follows:
- Molar mass of Ca = 40.08 g/mol
- Molar mass of O = 16.00 g/mol × 2 = 32.00 g/mol
- Molar mass of H = 1.01 g/mol × 2 = 2.02 g/mol
Now, we can add these together:
Total Molar Mass = 40.08 g/mol (Ca) + 32.00 g/mol (O) + 2.02 g/mol (H) = 74.10 g/mol
Therefore, the mass of a mole of calcium hydroxide, Ca(OH)₂, is approximately 74.10 grams.