How many moles of barium hydroxide, Ba(OH)2, are present in 162.1 g?

Question

finding moles of the element in the compound

 

Answer 1

The molar mass of barium hydroxide (as determined from the periodic table) is 171.34g/mol. This means that 1 mole of barium hydroxide has  a mass of 171.34g. We can use this relationship as a conversion factor to convert from 162.1g into moles:

162.1g x (1 mole/171.34g) = 0.9461 moles