At which temperature will water boil when the external pressure is 17.5 torr

The temperature required to boil will be 8.6 K

Explanation: The normal boiling point of water is taken as 100 °C

The pressure conditions at this temperature is 1 atm

Now, to calculate the temperature required to boil water present at 17.5 torr, we use Gay-Lussac's Law, which states that the pressure is directly proportional to the temperature at constant volume and number of moles.

Mathematically,

Initial conditions:

Final conditions:

Putting in above equation, we get

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explanation: