Which of the following is true regarding the concentration of solutions?
a. percent solutions are parts per 1000 parts.
b. molarity is one mole of solute per 1000 ml of solution.
c. to calculate molarity, one must know the atomic weight of the solvent.
d. to calculate molarity, one must know the atomic number of the solute

The correct answer is Option B.

Explanation:

Percent solution by mass (% m/m) means that amount of solute present in 100 grams of solution.

Percent solution by volume (% m/v) means that amount of solute present in 100 mL of solution.

Molarity is defined as the number of moles of solute present in 1 L of solution or 1000 mL of solution.

Hence, the correct answer is Option B.

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