Calculate the molal elevation constant of water, it being given that its latent heat of vaporisation is `2.257 kJ//g.`

Explanation

To calculate the molal elevation constant (Kb) of water using the given latent heat of vaporization (Lv), we can follow these steps:

### Step-by-Step Solution:

1. **Understand the Formula**:
The formula for calculating the molal elevation constant (Kb) is:
\[
K_b = \frac{R \cdot T_b^2}{1000 \cdot L_v}
...