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Hii:) anyone able to explain and help me with this question?

A fixed mass of gas is heated while kept at constant volume. Does the average distance apart change?

Thank you!

Respuesta :

Answer:

No

Explanation:

The equation of state for ideal gases tells that:

[tex]pV=nRT[/tex]

where

p is the gas pressure

V is the gas volume

n is the number of moles of the gas

R is the gas constant

T is the absolute temperature

In this problem, we have a fixed mass of gas. This means that the number of moles of the gas, [tex]n[/tex], does not change; also, the volume V remains the same, and R is a constant, this means that

[tex]p\propto T[/tex]

So, as the pressure increases, the temperature increases.

However, here we want to understand what happens to the average distance between the molecules.

We have said previously that the number of moles n does not change: and therefore, the total number of molecules in has does not change either.

If we consider one dimension only, we can say that the average distance between the molecules is

[tex]d=\frac{L}{N}[/tex]

where L is the length of the container and N the number of molecules. Since the volume of the container here does not change, L does not change, and since N is constant, this means that the average distance between the molecules remains the same.