How many moles of solute are contained in a 250.0-milliliter solution that has a concentration of 0.85 m?

210 moles
0.21 moles
3.4 moles
0.29 moles
0.85 moles

Option (b) is the correct answer.

Explanation:

It is known that molarity is the number of moles present in liter of solution.

Mathematically,    Molarity =

It is given that volume is 250 mL or volume in liter will be 0.25 L (as 1 L = 1000 mL) and molarity is given as 0.85 M.

Therefore, calculate the number of moles of the solute as follows.

          Molarity =

                 0.85 M =      

                no. of moles = 0.21 mol

Therefore, we can conclude that 0.21 moles of solute are contained in a 250.0-milliliter solution that has a concentration of 0.85 M.

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