Molarity Calculations Worksheet – Practice #1

Front

What is molarity?

Back

Molarity (M) is a measure of concentration defined as the number of moles of solute per liter of solution.

Front

How do you calculate moles from grams?

Back

To calculate moles from grams, use the formula: Moles = Mass (g) / Molar Mass (g/mol).

Front

What is the formula for calculating molarity?

Back

Molarity (M) = Moles of solute / Volume of solution (L).

Front

How many moles are in 1.5 L of a 2.0 M solution?

Back

3.0 moles (Moles = Molarity x Volume = 2.0 M x 1.5 L).

Front

What is the molar mass of NaCl?

Back

The molar mass of NaCl is approximately 58.44 g/mol.

Front

If you have 0.5 moles of a solute in 2 L of solution, what is the molarity?

Back

0.25 M (Molarity = 0.5 moles / 2 L).

Front

How do you convert liters to milliliters?

Back

To convert liters to milliliters, multiply by 1000 (1 L = 1000 mL).

Front

What mass of solute is needed to make a 1 M solution in 1 L?

Back

The mass needed equals the molar mass of the solute in grams.

Front

How do you find the volume of a solution if you know moles and molarity?

Back

Volume (L) = Moles / Molarity.

Front

What is the molarity of a solution with 2 moles of solute in 4 L of solution?

Back

0.5 M (Molarity = 2 moles / 4 L).