A gas inside a piston initially has a pressure of 1.2 bars at temperature of 25 degree C and volume of 20.0 mL. If temperature is increased to 120 deg C and the piston expands to a volume of 80 mL, what is the new pressure

The new pressure is 0.39 bar

Explanation:

Combined gas law is the combination of Boyle's law, Charles's law and Gay-Lussac's law.

The combined gas equation is,

where,

= initial pressure of gas = 1.2 bar

= final pressure of gas = ?

= initial volume of gas = 20.0 ml

= final volume of gas = 80.0 ml

= initial temperature of gas =

= final temperature of gas =

Now put all the given values in the above equation, we get:

The new pressure is 0.39 bar

the answer is 1 i believe