Answer
355 torr, or $4.73\times10^4 Pa$.
Work Step by Step
The saturated vapor pressure of water equals the external air pressure when it boils.
We see from Table 13–3 that the saturated vapor pressure at $80^{\circ}C$ is 355 torr, or $4.73\times10^4 Pa$.
That is also the air pressure there.
