A balloon with helium (g) has volume of 1.40 L at T = 25.0°C.

Assuming constant pressure, what volume will the balloon occupy, if it is placed in the freezer and cooled to -22.0°C?

Question

A balloon with helium (g) has volume of 1.40 L at T = 25.0°C.

Assuming constant pressure, what volume will the balloon occupy, if it is placed in the freezer and cooled to -22.0°C?

| General Chemistry 2

Accepted Answer

Situation 1: V₁ = 1.40 L and T₁ = 25.0°C = 298 K

Situation 2: T₂ = -22.0°C = 251 K

Charles’s Law:

At constant pressure, V and T are directly proportional:

V₁ / T₁ = V₂ / T₂ ⇒ V₂= $\frac{V_{1} \times T_{2}}{T_{1}}$

V₂=

\frac{1.40 \times 251}{298}

= 1.18 L

Exercise 2 | Properties of Gases