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How many grams of beryllium chloride would you need to add to 125 mL of water to make a 0.050 molal solution?

 

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To determine how many grams of beryllium chloride you would need to add to 125 mL of water to make a 0.050 molal solution, you need to use the following formula:

molality = moles of solute / mass of solvent (in kg)

First, we need to calculate how many moles of beryllium chloride we need for a 0.050 molal solution.

molality = 0.050 mol/kg
moles of solute = molality x mass of solvent (in kg)
moles of solute = 0.050 mol/kg x 0.125 kg = 0.00625 mol

Next, we can use the molar mass of beryllium chloride to calculate how many grams of beryllium chloride we need:

molar mass of BeCl2 = 79.9 g/mol

mass of solute = moles of solute x molar mass of solute
mass of solute = 0.00625 mol x 79.9 g/mol = 0.499 g

Therefore, you would need to add 0.499 grams of beryllium chloride to 125 mL of water to make a 0.050 molal solution.