Concentration Calculations in Chemistry

A solution is prepared by diluting 50 mL of a 6 M HCl solution to a final volume of 300 mL. What is the molarity of the diluted solution?

• 1 M

• 2 M

• 0.5 M

• 1.5 M

What is the molar mass of NaCl?

• 58.44g/mol

• 22.99g/mol

• 35.45g/mol

• 0.500 M

Calculate the the molar mass of glucose ( C₆H₁₂O₆ ).

• 180.16 g/mol

• 220.03 g/mol

• 113.06 g/mol

• 201.15 g/mol

Calculate the concentration in molarity of a solution containing 20 grams of glucose (C₆H₁₂O₆, use molar mass = 180 g/mol) dissolved in 250 mL of water.

• 0.444 M

• 0.222 M

• 0.111 M

• 0.888 M

How many moles of solute are present in 500 mL of a 2 M NaOH solution?

• 0.5 moles

• 1 mole

• 2 moles

• 0.25 moles

You need to prepare 1 L of a 0.5 M KCl solution. How many grams of KCl (molar mass = 74.55 g/mol) are required?

• 37.275 g

• 74.55 g

• 18.6375 g

• 50 g

A 10 mL sample of a 3 M solution is diluted to a final volume of 60 mL. What is the new concentration?

• 0.5 M

• 1 M

• 0.75 M

• 1.5 M

What is the molarity of a solution made by dissolving 5 moles of solute in 2 liters of solution?

• 2.5 M

• 5 M

• 10 M

• 1 M

Urea is a compound often used fertilizers and plastics. Calculate its molar mass if its chemical formula NH₂CONH₂ rounded to the nearest whole number.

• 60. g/mol

• 175 g/mol

• 81.5 g/mol

• 28.05 g/mol

Calculate the molality of a solution containing 15 grams of urea (NH₂CONH₂, molar mass = 60 g/mol) in 200 grams of water.

• 1.25 m

• 0.75 m

• 1.5 m

• 0.5 m