Question

Molarity of water is \(\underline{\hspace{2cm}}\)

Hint:

The molarity of pure water is derived using its density and molar mass.

Answer 1

Step 1: Molarity of water.
Molarity is the number of moles of solute per liter of solution. The molarity of pure water is calculated as follows:
- Molarity = \( \frac{\text{Density of water}}{\text{Molar mass of water}} \).
- Given that water's molar mass is \( 18 \, \text{g/mol} \) and its density is approximately \( 1 \, \text{g/cm}^3 \), we calculate the molarity as:
\[ \frac{1000 \, \text{g/L}}{18 \, \text{g/mol}} = 55.56 \, \text{mol/L}. \]

Step 2: Conclusion.
Thus, the molarity of water is 55.56 mol/litre.