Answer:
The temperature of the water is 70°C
Step-by-step explanation:
Partial pressure of helium gas = 526 mmHg
Total pressure inside the jar= 760 mmHg
Suppose partial pressure of helium gas is
and partial pressure of water is

And total pressure is

As we know

Hence
Putting the values



In bar,

= 0.312 bar
Now according to the steam table
With the vapour pressure of water as 0.312 bar the temperature corresponds to 70°C