Question

The number of gram molecules of a substance present in unit volume is termed as:

• A. Activity
• B. Normal solution
• C. Molar concentration
• D. Active mass

Hint:

Molarity (M) is defined as the number of moles of solute per liter of solution and is very useful in reactions, where we’re using moles to balance the reactions. However, molarity changes with temperature due to changes in volume, and molality is preferred in that case.

Answer 1

The Correct Option is C

Molar concentration, also known as molarity, is defined as the number of moles of a solute present in 1 liter of solution. It is expressed as:
\(M = \frac{\text{moles of solute}}{\text{volume of solution (L)}}\)
This concept is critical in stoichiometric calculations and solution preparation. Other related terms include:
Activity: Effective concentration of a species in a solution.
Normal solution: Concentration expressed in equivalents per liter.
Active mass: An older term used in reaction rate expressions.