a) Mark which of the following statements are true. For a pure substance, the sl

Question

a) Mark which of the following statements are true. For a pure substance, the slope of the liquid-solid coexistence curve in the P vs T diagram is positive if the solid has a lower molar density than the liquid. For a pure substance, the triple point in the phase diagram can be observed in places involving only liquid and gas phases. Raoult's law predicts that any pair of components can be separated via distillation The activity coefficient can be the same for solute and solvent standard states. The activity coefficient only accounts for the difference in molar volume of components when they are pure and in the mixture. Activity coefficients of Raoult's law are always greater than 1. Henry's law only applies to non-ideal mixtures The chemical potential of a solute in two solutions with different solvents is the same if the molar fraction is the same. e osmotic pressure is caused by the difference in the chemical potential of the solute in the two compartments. The equilibrium constants Kp and Ke are not equal simply because of units The small dependence of the Ke with pressure for a chemical reaction involving only liquids is due to the small dependence of the V with pressure Gibbs free energy of a reaction can be calculated in any condition using. G = 6"-RTln (Q) where Q is the reaction quotient and contains all the activities

Explanation / Answer

a) True or false statements

For a pure substance, the slope of the liquid-solid coexistence curve in the P vs T diagram is positive if the solid has a lower molar density than the liquid - True

For example in ice.

For the pure substance, the triple point in the phase diagram can be observed in places involving only liquid and gas phases : False

Triple point always has all the phases of matter, the solid, liquid and gas.

Raoult's law predicts that any pair of components can be separated via distillation : True

By taling into consideration of chemical potential this can be done.

The activity coefficient can be the same for solute and solvent standard state : True

The activity coefficients only accounts for the difference in molar volume of components when they are pure and in the mixture : True

Activity coefficients of Raoult's law are always greater than 1 : False

We can have positive or negative deviation from Raoult;s law.

Henry's law only applies to non-ideal mixtures : True

For ideal mixtures, Raoult's law is applicable.

The chemical potential of a solute in two solutions with different solvents is the same if the molar fraction is the same : True

Chemical potential is measured in terms of mole fraction.

The osmotic pressure is caused by the difference in the chemical potential of the solute in the two compartments : True

The equilibrium constants Kp and Kc are not equal simply because of units : False

Equilibrium constants do not have any units.

The small dependence of the Kc with pressure for a chemical reaction involving only liquids is due to the small dependence of the Vi with pressure : True

In a chemical reaction, the major difference or dependence comes from change in volume of the system.

The Gibbs free energy of a reaction can be calculated in any condition using, dG = dGo - RTlnQ, where Q is the reaction quotient and contains all the activites - False.

The correct equation for Gibbs fre energy calculations is, dG = dGo + RTlnK

Related Questions

Navigate

• Browse (All)
• Browse A
• Subjects

---

---

Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.