![]() ![]() For a pure substance in a condensed state (liquid or solid), the standard state is the pure liquid or solid under 1 bar pressure.(Hence taking infinite-dilution behavior to be the standard state allows corrections for non-ideality to be made consistently for all the different solutes.) For a substance present in a solution, the standard state is a concentration of exactly 1 M at an applied pressure of 1 bar, but exhibiting infinite-dilution behavior.For a gas, the standard state is as a pure gaseous substance as a (hypothetical) ideal gas at a pressure of exactly 1 bar.The superscript degree symbol (°) indicates that substances are in their standard states. And again, if we just go down the halogen group on the periodic table, we see that F two has the lowest Miller Mass, followed by CEO.The term standard state is used to describe a reference state for substances, and is a help in thermodynamical calculations (as enthalpy, entropy and Gibbs free energy calculations). So if we look at the four di atomic, so we're given in part a and we look at the location of this Adams on the periodic table, we should find that this is the correct ranking for part A F two as a gas will have the lowest eight or malware entropy followed by seal, too, and then be are, too, and I, too, will have the highest standard molar entropy. That means the more disorder due to a higher molecular complexity, there will be in that molecule. We know that the more mass that the Adams have in the compounds. If we examine the atoms that make up each one of the dye atomic gases, we can rank them based on the molar masses of those Adams. And we know that low entropy corresponds to more order, and higher entropy corresponds to more disorder. So the only way that we can distinguish them is by what, uh, what Adam's make up those molecules. We see that all four of the dye atomic molecules are gases. It is helpful to first distinguish if there are any different states of matter because we know that gases will have the highest animal or entropy. ![]() So in Port A were given four different die atomic gas molecules in order to distinguish between standard Miller entropy, ease of different substances. In the rate, most molecules will have the highest standard molar entropy. So the way that we will present our answer is using this spectrum here where the left side will represent the molecules with the lowest intern, Miller entropy. In each part of this problem, we are given several different compounds and we want to rank them in order of increasing entered more entropy. Therefore, the standard molar entropy increases in the same order: $\mathrm(g)$. Looking at the periodic table, we can see that the molar mass increases in the order F < Cl < Br < I. The complexity increases with the molar mass of the atoms. Therefore, we need to compare their molecular complexity. It increases with the complexity of the molecule and the state of matter (gas > liquid > solid).įor part a, all the molecules are diatomic gases. ![]() The standard molar entropy (S°) is a measure of the amount of disorder in a system. ![]()
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