Agas at 29.4 kpa is cooled from a temperature of 75°c to a temperature of 25°c at constant volume. what is the new pressure of the gas?

Answer : The new pressure of gas will be, 25.176 kPa

Solution :

Gay-Lussac's Law : It is defined as the pressure of the gas is directly proportional to the temperature of the gas at constant volume and number of moles.

or,

where,

= initial pressure of gas = 29.4 kPa

= final pressure of gas = ?

= initial temperature of gas =

= final temperature of gas =

Now put all the given values in the above equation, we get the final pressure of gas.

Therefore, the new pressure of gas will be, 25.176 kPa