Stoichiometry: Calculations with Chemical Formulas and Equations

 

50) m = 2.472 g MgSO4          m = 5.061 g MgSO4•xH2O

      

      m = 5.061 g MgSO4•xH2O - 2.472 g MgSO4 = 2.59 g H2O

      n = 2.59 g H2O * 1 mol H2O/18.02 g H2O = 0.144 mol H2O

      n =  2.472 g MgSO4 * 1 mol MgSO4/120.36 g MgSO4 = 0.0205 mol MgSO4

     

      0.0205MgSO4•0.144H2O ===> 0.0205/0.0205MgSO4•0.144/0.0205H2O ===> MgSO4•7H2O