Question

Agas is contained in a thick-walledballoon. When the pressure changesfrom 100 kPa to 90.0 kPa, thevolume changes from 2.50 L to3.75 L and the temperature changesfrom 303 K toK.

Answer 1

In this question, we have a situation where all 3 known gas laws are being used in what is called the Combined gas law, and the formula for this law is:

P1V1/T1 = P2V2/T2

We have:

P1 = 100 kPa, or 0.987 atm

V1 = 2.50 Lites

T1 = 303 K

P2 = 90 kPa, or 0.888 atm

V2 = 3.75 L

T2 = ?

Now we add these values into the formula:

0.987 * 2.50/303 = 0.888 * 3.75/T2

2.47/303 = 3.33/T2

0.00815 = 3.33/T2

T2 = 408 K is the new temperature