What is the molal concentration of a solution made by dissolving 34.2g of sucrose (C12H22O11) (molar mass 342.34)
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To find the molal concentration of a solution, we need to first determine the number of moles of solute (sucrose) and the mass of the solvent (usually water) in the solution. Molal concentration is expressed in moles of solute per kilogram of solvent.
Let's break down the steps to find the molal concentration of the sucrose solution:
Step 1: Calculate the number of moles of sucrose:
To find the number of moles of sucrose, divide the given mass of sucrose by its molar mass.
molar mass of sucrose (C12H22O11) = 342.34 g/mol
mass of sucrose = 34.2 g
moles of sucrose = mass of sucrose / molar mass of sucrose
= 34.2 g / 342.34 g/mol
≈ 0.0998 mol
Step 2: Determine the mass of the solvent (water):
Since the question does not provide information about the mass of the solvent water, we cannot calculate the molal concentration. However, if you have the mass of the solvent, you can proceed to the next step.
Step 3: Calculate the molal concentration:
Molal concentration (m) is defined as the number of moles of solute divided by the mass of the solvent in kilograms.
molal concentration = moles of solute / mass of solvent (kg)
But since we don't have the mass of the solvent, we cannot calculate the molal concentration in this case.
If you are given the mass of the solvent, you can proceed by dividing the moles of sucrose by the mass of the solvent in kilograms to find the molal concentration.