The molar mass of nickel(II) nitrate, Ni(NO3)2, can be calculated by adding up the molar masses of its constituent elements.
1. **Nickel (Ni)**: The atomic mass of nickel is approximately 58.69 g/mol.
2. **Nitrogen (N)**: The atomic mass of nitrogen is about 14.01 g/mol. Since there are two nitrate ions in nickel(II) nitrate, and each nitrate has one nitrogen, we multiply by 2, giving us 2 * 14.01 g/mol = 28.02 g/mol.
3. **Oxygen (O)**: The atomic mass of oxygen is around 16.00 g/mol. Each nitrate ion has three oxygen atoms, and with two nitrate ions, that totals 6 oxygen atoms. So, we multiply by 6, resulting in 6 * 16.00 g/mol = 96.00 g/mol.
Now, let’s sum these contributions:
- Nickel: 58.69 g/mol
- Nitrogen: 28.02 g/mol
- Oxygen: 96.00 g/mol
Adding them together, we get:
58.69 g/mol + 28.02 g/mol + 96.00 g/mol = 182.71 g/mol
Therefore, the molar mass of Ni(NO3)2 is approximately 182.71 g/mol.