Question

P₁

T₁ V₁
T₁
P₂
=
For each of the following situations, determine which
Gas Law equation you would use to answer the
question.
V₂
P₁V₁ = P₂V₂
Situation 1- Suppose we have a 2.37-L sample of gas at 298 K that
is then heated to 354 K with no change in pressure. What is the final
volume of the sample?
Situation 2 - If a gas originally at 750 torr is cooled from 323.0 K to
273 K and the volume is kept constant, what is final pressure of the
gas?
Situation 3-A snorkeler takes a syringe filled with 16 mL of air from
the surface, where the pressure is 1.0 atm, to an unknown depth.
The volume of the air in the syringe at this depth is 7.5 ML. What is
the pressure at this depth?
Gas Law Equation

Answer 1

For Situation 1, where the temperature of a gas sample changes at constant pressure, you would use the Combined Gas Law equation:

P₁V₁/T₁ = P₂V₂/T₂

For Situation 2, where the volume of a gas sample is kept constant while the temperature changes, you would use the Gay-Lussac's Law equation:

P₁/T₁ = P₂/T₂

For Situation 3, where the volume of a gas sample changes at constant temperature, you would use Boyle's Law equation:

P₁V₁ = P₂V₂

Note: In all the equations above, P₁, P₂ represent the initial and final pressure respectively, V₁, V₂ represent the initial and final volume respectively, and T₁, T₂ represent the initial and final temperature respectively.