Question

Q1.What will be the volume of a gas when
3 litres of it is cooled down from 27°C to -73°C
at constant pressure.
​

Answer 1

Step-by-step explanation:

Given :

• Initial temperature = 27 °C
• Final temperature = -73 °C
• Initial volume = 3 L

To Find :

• Final volume of the gas.

Solution :

❖ Charles' law : Pressure remaining constant, the volume of a fixed mass of a gas is directly proportional to its absolute temperature.

Mathematically, V ∝ T

First of all we have to convert unit of temperature from °C to K..

We know that, 0 °C = 273 K

➛ T₁ = 27 °C = 27 + 273 = 300 K

➛ T₂ = -73 °C = -73 + 273 = 200 K

By substituting the given values;

➠ V₁ / V₂ = T₁ / T₂

➠ 3 / V₂ = 300 / 200

➠ V₂ = 3 × 2/3

➠ V₂ = 2 L