Which is the correct representation to express the molar concentration (M) of any solution ?

Options

A. `("No.of gram equivalent of solute")/("Volume of solution in litre")`
B. `("No.of moles of solute")/("Volume of solution in litre")`
C. `("No.of moles of solute")/("Mass of solvent in kg")`
D. `("No.of moles of any constituent")/("Total no.of moles of all constituents")`

Answer

To determine the correct representation of molar concentration (M) of any solution, we need to understand what molarity means and how it is defined.

### Step-by-Step Solution:

1. **Understanding Molarity**:
- Molarity (M) is defined as the number of moles of solute per liter of solution. It is a way to express the concentration of a solution.

2. **Formula for Molarity**:
- The formula for calculating molarity is:
\[ M = \frac{\text{Number of moles of solute}}{\text{Volume of solution in liters}} \]

3. **Analyzing the Options**:
- We are given several options to choose from. We need to identify which option correctly represents the formula for molarity.
- The correct representation should match the formula we just stated.

4. **Identifying the Correct Option**:
- Among the options provided, we look for the one that states:
- "Number of moles of solute to the volume of solution in liters."
- This matches our understanding of molarity.

5. **Conclusion**:
- The correct representation of molar concentration (M) is:
\[ \text{Molarity (M)} = \frac{\text{Number of moles of solute}}{\text{Volume of solution in liters}} \]

### Final Answer:
The correct representation to express the molar concentration (M) of any solution is:
\[ \text{M} = \frac{\text{Number of moles of solute}}{\text{Volume of solution in liters}} \]