The balloon will reach its maximum volume and it will burst.
Given:
- A weather balloon at sea level, with gas at 65.0 L volume, 745 Torr pressure, and 25C temperature.
- When the balloon was taken to an altitude at which temperature was 25C and pressure was 0.066atm its volume expanded.
- The maximum volume of the weather balloon is 835 L.
To find:
Whether the weather balloon will reach its maximum volume or not.
Solution:
The pressure of the gas in the weather balloon at sea level = 

The volume of the weather balloon at sea level = 
The temperature of the gas in the weather balloon at sea level:

The balloon rises to an altitude.
The pressure of the gas in the weather balloon at the given altitude:

The volume of the weather balloon at the given altitude = 
The temperature of the gas in the weather balloon at the given altitude:

Using the Combined gas law:

The maximum volume of the weather balloon= V = 835 L

The volume of the weather balloon at a given altitude is greater than its maximum volume which means the balloon will reach its maximum volume and it will burst.
Learn more about the combined gas law:
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