A250. ml sample of gas at 1.00 atm and 20.0°c has the temperature increased to 40.0°c and the volume increased to 500. ml. what is the new pressure?
a. 0.374 atm
b. 0.534 atm
c. 2.14 atm
d. 1.87 atm
e. 0.468 atm

Answer : The new pressure is, 0.534 atm

Solution :

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 = 1.00 atm

= final pressure of gas = ?

= initial volume of gas = 250 ml

= final volume of gas = 500 ml

= 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 is, 0.534 atm