A 45 mL sample of nitrogen gas is cooled from 135ºC to 15 C in a container that can contract or expand at constant pressure. What is the new volume of the nitrogen gas?

V₂ = 31.8 mL

Explanation:

Given dа ta:

Initial volume of gas = 45 mL

Initial temperature = 135°C (135+273 = 408 K)

Final temperature = 15°C (15+273 = 288 K)

Final volume of gas = ?

Solution:

The given problem will be solve through the Charles Law.

According to this law, The volume of given amount of a gas is directly proportional to its temperature at constant number of moles and pressure.

Mathematical expression:

V₁/T₁ = V₂/T₂

V₁ = Initial volume

T₁ = Initial temperature

V₂ = Final volume

T₂ = Final temperature

Now we will put the values in formula.

V₁/T₁ = V₂/T₂

V₂ = V₁T₂/T₁

V₂ = 45 mL * 288 K / 408 k

V₂ = 12960 mL. K / 408 K

V₂ = 31.8 mL