Question

What is common to solving all mola mass problems?

Answer 1

All you need to do is to follow these 3 steps.

1. Estimate the number of each kind of atom present in the compound using the chemical formula in order to determine the molar mass of the molecule.

1. Divide each element's atomic weight (found in the periodic table) by the quantity of that element's atoms in the compound.
2. Add up the total, then follow the number with the units of grams/mole.

eg. Water

• 2 hydrogen atoms and 1 oxygen atom make up the chemical formula H20.
• H- 1's atomic weight
• O-16's atomic weight
• Number of H atoms overall in formula 2
• Number of O atoms overall in formula 1
• The molar mass will thus be as follows: H 2 x 1= 2 O 1 x 16= 16 16+2= 18
• Water's molar mass is 18 g/mol as a result.