Unit 10: Molarity Calculation Worksheet

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 molarity?

Back

Molarity (M) = moles of solute / liters of solution.

Front

What is the formula to convert grams to moles?

Back

Moles = grams / molar mass.

Front

What is the molar mass of H2SO4?

Back

The molar mass of H2SO4 (sulfuric acid) is approximately 98.08 g/mol.

Front

How do you convert cm³ to L?

Back

To convert cm³ to L, divide the volume in cm³ by 1000.

Front

If you have 10.0 grams of NaOH, how do you find its molarity in a 250.0 cm³ solution?

Back

First, convert grams to moles using the molar mass of NaOH (approximately 40.00 g/mol), then convert 250.0 cm³ to L (0.250 L), and finally use the molarity formula.

Front

What is the molarity of a solution with 90.0g of C6H12O6 in 250.0 cm³?

Back

First, convert grams to moles (90.0 g / 180.18 g/mol = 0.499 moles), then convert 250.0 cm³ to L (0.250 L), and calculate molarity: M = 0.499 moles / 0.250 L = 1.996 M.

Front

How many grams of H2SO4 are needed for a 1.00M solution in 500.0 cm³?

Back

Calculate moles needed: Moles = Molarity x Volume (in L) = 1.00 mol/L x 0.500 L = 0.500 moles. Then convert to grams: 0.500 moles x 98.08 g/mol = 49.0 g.

Front

What is the relationship between moles and molarity?

Back

Moles are the amount of substance, while molarity is the concentration of that substance in a given volume of solution.

Front

What is the significance of a 1.00M solution?

Back

A 1.00M solution contains 1 mole of solute per liter of solution, indicating a specific concentration.