5.4 Molarity

A sample of O2 contains 9.32 x 10^26 molecules. How many moles are present? (round to two places after the decimal).

You are asked to make a 4 L solution with a molarity of 2.3 M. How many moles of solute do you need? (round to two places after the decimal and include the proper units: mol, M, or L)

You are asked to make a solution with a volume of 125 L using 2.3 moles of NH3. What is the concentration of the solution? (round to two places after the decimal and include the proper units - M, mol, or L)

You use 0.75 moles of H2SO4 to make a 0.5 M solution. What is the volume of the final solution? (include the proper units - M, mol, or L)

Which solution contains the greatest number of moles of solute?

• A

• B

• C

• D