$100$ moles of moist air at $70 \%$ relative humidity is cooled from $70^{\circ} \mathrm{C}$ to $50^{\circ} \mathrm{C}$ at a constant pressure of $1$ bar . The vapour pressures of water are given in the table. The number of moles of water left in the moist air at the end of this process is _________ $\text{(rounded off to two decimal places)}$.
| Temperature $\left({ }^{\circ} \mathbf{C}\right)$ |
Vapour Pressure (kPa) |
| $50$ |
$12.34$ |
| $70$ |
$31.16$ |
