Example for next four problems:
Compound formula: MgCl2
Element: Mg
# of Atoms: 1
Element: Cl
# of Atoms: 2
gram formula weight (g): 95.21
Compound Formula: KNO3
Element: K
# of Atoms:
Element: N
# of Atoms:
Element: O
# of Atoms:
gram formula weight (g):
Element: K
# of Atoms: 1
Element: N
# of Atoms: 1
Element: O
# of Atoms: 3
gram formula weight (g): 101.1
For the compound formula KNO3:
Element: K
# of Atoms: 1
Element: N
# of Atoms: 1
Element: O
# of Atoms: 3
Gram formula weight (g): To calculate the gram formula weight, we need to find the atomic weights of each element and multiply them by the number of atoms in the compound.
The atomic weight of K is 39.10 g/mol.
The atomic weight of N is 14.01 g/mol.
The atomic weight of O is 16.00 g/mol.
Calculating the gram formula weight:
(39.10 g/mol × 1 atom of K) + (14.01 g/mol × 1 atom of N) + (16.00 g/mol × 3 atoms of O) = 39.10 + 14.01 + 48.00 = 101.11 g/mol