A gas sample has an original volume of 580 ml when collected at 1.20 atm and 22oC. If a change is made in the gas pressure which causes the volume of the gas sample to become 1.45 liters at 40oC, what is the new pressure?

The new pressure is 0.509 atm

Explanation:

The combined gas equation is,

where,

= initial pressure of gas = 1.20 atm

= final pressure of gas = ?

= initial volume of gas = 580 ml

= final volume of gas = 1.45 L = 1450 ml     (1L=1000ml)

= initial temperature of gas =

= final temperature of gas =

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

The new pressure is 0.509 atm