Arrange these gases in order of decreasing standard molar entropy:
Rank from largest to smallest. Kr,Cl2,SO3
Chemistry is the subject, not Delaware State University.
The most complicated has the largest, the least complicated has the least S.
sdc
To determine the order of decreasing standard molar entropy, we need to consider some factors that affect entropy.
1. Number of particles: The more particles present, the greater the entropy. This is because there are more ways to arrange and distribute the particles over different energy levels.
2. Molecular complexity: Generally, more complex molecules have higher entropy compared to simple molecules because they have more degrees of freedom.
3. Phase: Gases generally have higher entropy than liquids or solids because particles in gases have more freedom of movement.
Based on these factors, let's analyze each of the given gases:
1. Kr (Krypton): Krypton is a noble gas that exists as individual atoms. Since it is a monatomic gas, it has fewer particles and a simpler molecular structure compared to the other two compounds. Therefore, Kr will have the lowest standard molar entropy among the given gases.
2. Cl2 (Chlorine gas): Chlorine gas consists of diatomic molecules (Cl-Cl). Although it has more particles than Kr, it is still a relatively simple molecule. Therefore, Cl2 will have an intermediate standard molar entropy.
3. SO3 (Sulfur trioxide): Sulfur trioxide consists of one sulfur atom and three oxygen atoms (SO3). It is a more complex molecule compared to Kr and Cl2 because it contains multiple atoms. Additionally, it exists as a gas, providing more freedom of movement for its particles. Therefore, SO3 will have the highest standard molar entropy among the given gases.
Based on this analysis, the order of decreasing standard molar entropy is:
SO3 > Cl2 > Kr