Unit 3 Exam

Front

What is molality?

Back

Molality (m) is a measure of the concentration of a solute in a solution, defined as the number of moles of solute per kilogram of solvent.

Front

How do you calculate molality?

Back

The formula for molality is m = mol of solute / kg of solvent.

Front

What is the unit of molality?

Back

The unit of molality is m (mol/kg).

Front

How do you convert grams of solvent to kilograms?

Back

To convert grams to kilograms, divide the mass in grams by 1,000.

Front

What is the formula for calculating the concentration in percent by volume?

Back

Percent by volume = (Volume of solute / Total volume of solution) x 100.

Front

If you have a 1.82 M solution and dilute it to 1.14 M, how do you find the final volume?

Back

Use the dilution formula: C1V1 = C2V2, where C is concentration and V is volume.

Front

What is the relationship between molarity and molality?

Back

Molarity (M) is moles of solute per liter of solution, while molality (m) is moles of solute per kilogram of solvent.

Front

What is the significance of the solvent in a solution?

Back

The solvent is the substance that dissolves the solute, typically present in greater amount.

Front

How do you find the number of moles from grams?

Back

To find moles, divide the mass of the substance (in grams) by its molar mass (g/mol).

Front

What is the molar mass of NaCl?

Back

The molar mass of NaCl (sodium chloride) is approximately 58.44 g/mol.