Calculating Molar Mass

Steps

1. Break the compound into its component atoms

2. Multiply the number of moles x molar mass

Sulfur 1 mole x (32.07g/mole) = 32.07g

Oxygen 2 mole x (16.00 g/mole) = 32.00g

3. Add up the total. ------

64.07g

Calculate the Molar Mass of the following

Compound / Atoms / Number of Moles / Average Atomic Mass / Mass of Element / Total
C2H3Cl
NH3
H2O
H2SO4
Ca(NO3)2

Calculating Mass from Moles or Moles from Mass

1. Calculate the molar mass (see above).

2. Use the equality 1 mole = molar mass to create the proper conversion factor.

1 mole SO2 = 64.07 g SO2

3. Multiply by the conversion factor, checking to make sure units cancel.

Mass to Moles

45 g of SO2 x (1 mole SO2/64.07g SO2) = 0.70 mole SO2

or Moles to Mass

1.82 mole of SO2 x (64.07g SO2/1 mole SO2) = 117g SO2

Problem / Equality / Conversion Factor / Answer
3.5 mole C2H3Cl
812 g of NH3
0.03 mole H2O
0.05 g H2SO4
102 mole Ca(NO3)2