Molar Mass

How to find the molar mass of a compound.

1. Write the correct formula: Calcium chloride, CaCl2

2. List all individual elements3. Determine the number of type4. Times by the molar mass5. Add them up and label

CaCl

12

40.08 g =35.45 g =

40.08 g70.90 g

110.98 g CaCl2

mol

Molar mass of copper(II) nitrate

Cu(NO3)2 times the N and O3 by two

CuNO

1 x 63.55 g = 63.55 g

2 x 14.01 g = 28.02 g

6 x 16.00 g = 96.00 g

187.6 g Cu(NO3)2

mol

Molar mass of hydrated compoundMagnesium chloride hexahydrate

MgCl2 * 6 H2O (means there are 6 waters trapped)

Mg 1 x 24.31 g = 24.31 gCl 2 x 35.45 g = 70.90 gH 12 x 1.008 g = 12.096 gO 6 x 16.00 g = 96.00 g

203.3 g MgCl2 * 6H2O mol