Place the following systems in order of increasing randomness :
(a) 1 mol of a gas X.
(b) 1 mol of a solid X.
(c) 1 mol of a liquid X.
Answers
Increasing order :
b<c<a.
Answer: 1 mole of solid X< 1 mole of liquid X < 1 mole of gaseous X
That is (a) > (c) > (b)
Explanation:
Entropy is defined as measure of randomness in a system.
It depends upon some minute changes.
∆S= ∆Q/∆T,
Where S is entropy
Q is heat and
T is temperature.
As energy increases, randomness increases and entropy increases.
Gas has more entropy as the atoms will have more space to bounce and collide around.
In solid the atoms are closely packed and in orderly arrangement.
Thus they will show less randomness and thus less entropy.
In liquids, the particles are less tightly bound as compared to solids and more tightly bound as compared to gases.
They will have more randomness as compared to solids and less randomness as compared to liquids.
Hence
1 mole of solid X< 1 mole of liquid X < 1 mole of gaseous X