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
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.