The molar mass of chromium(III) oxide, represented as Cr2O3, can be calculated by summing the molar masses of its constituent elements: chromium (Cr) and oxygen (O).
1. First, find the molar mass of chromium (Cr). The atomic mass of chromium is approximately 51.996 g/mol.
2. Next, find the molar mass of oxygen (O). The atomic mass of oxygen is about 15.999 g/mol.
3. Since there are two chromium atoms in the formula, we multiply the molar mass of chromium by 2: 2 × 51.996 g/mol = 103.992 g/mol.
4. There are three oxygen atoms in the formula, so we multiply the molar mass of oxygen by 3: 3 × 15.999 g/mol = 47.997 g/mol.
5. Finally, we add the two results together to find the total molar mass of Cr2O3: 103.992 g/mol + 47.997 g/mol = 151.989 g/mol.
Thus, the molar mass of Cr2O3 is approximately 151.99 g/mol.