To calculate the molar mass of Pb(NO3)2, you need to add up the atomic masses of all the atoms in the compound, taking into account the number of each atom in the molecule.
The molecular formula of Pb(NO3)2 indicates that there is one lead atom (Pb), two nitrogen atoms (N), and six oxygen atoms (O) in the compound.
The atomic mass of lead (Pb) is 207.2 g/mol. The atomic mass of nitrogen (N) is 14.0 g/mol, and the atomic mass of oxygen (O) is 16.0 g/mol.
Therefore, the molar mass of Pb(NO3)2 can be calculated as:
Molar mass of Pb(NO3)2 = (1 x 207.2 g/mol) + (2 x 14.0 g/mol) + (6 x 16.0 g/mol)
= 207.2 g/mol + 28.0 g/mol + 96.0 g/mol
= 331.2 g/mol
Therefore, the molar mass of Pb(NO3)2 is 331.2 g/mol.