Question

What does a graph representing Charles’s law show?

Answer 1

Chemistry Graphs: Charles' Law. Charles' Law states that the volume (V) of a confined gas is directly proportional to its temperature (T) in Kelvin. ... Use the following graph of Volume vs. Temperature to answer the next four questions.

Answer 2

Before answering the question, first we have to understand Charle's law.

Charle's law states that the volume of a given mass of gas increases or decreases by $\frac{1}{273}$ of its volume at zero degree celsius for every one degree celsius rise or fall of temperature.

Let the volume of a gas at zero degree celsius is denoted as $V_{o}$

Hence, the volume of the gas at t degree celsius is calculated -

                                       $V_{t}=\ V_{o} (1+\frac{t}{273})$

                                                     $=\ V_{o} (\frac{273+t}{273})$

                                                     $=\ V_{0}\frac{T}{273}$

Here, T is the temperature of the gas at kelvin.

From above we see that $V\ \alpha\ T$.

At t = -273 degree celsius i.e T = 0 K, the volume of the gas will be zero.

Now the graph is plotted taking volume V along Y-axis and temperature t along X-axis.

The graph will be a straight line and it will intersect X-axis at t = -273 degree celsius.