Atomic Mass - October 21st Class

Today, in class we learned how to find the molar mass in compounds.
Atomic Mass: The mass of 1 mole of atoms in an element
- The mass of 1.0 mol of 'C' atoms is 12.0g
- The mass of 1.0 mol of 'Ca' atoms is 40.1g

Molecular Mass: The mass of 1.0 mole of molecules of an element or compound
N2, O2, F2, Br2, H2, Cl2, I2
P4, S8

Assume all the rest are monoatomic



Finding the Molar Mass of Compounds
H2O
2 H= 2.0 (1.0) = 2.0
1 O = 1 (16.0) = 16.0
Total = 18.0 g/mol



- Find the molar mass of Ammonium phosphate

NH4+
PO4³- = (NH4)3PO4

3 N = 3(14.0) = 42

12 H = 12(1.0) = 12

1 P = 1(31.0) = 31

4 0 = 4(16.0) = 64

Total = 149 g/mol



Converting Mass <-> Moles