How many grams of barium hydroxide required to dissolve in 156g of water to make a 0.247m solution?
To answer this question, we need two things:
- The molar mass of barium hydroxide, 171.34 g/mol
- The equation for molality:
We are given the molality and mass of solvent. The mass of solvent is expressed in terms of grams and we need kilograms so the following relationship must be used:
1000g = 1kg
Divide 156g by 1000 to obtain 0.156 kg of solvent.
Next, we determine the number of moles of solute (barium hydroxide), by rearranging the equation:
Moles of solute = Molality x Mass of solvent
Since we want the mass of