For each of the following processes, indicate whether thesigns of ΔS and ΔH are expected to be positive, negative,or about zero. (a) A solid sublimes. (b) The temperature ofa sample of Co(s) is lowered from 60 °C to 25 °C. (c) Ethylalcohol evaporates from a beaker. (d) A diatomic moleculedissociates into atoms. (e) A piece of charcoal is combustedto form CO2(g) and H2O(g).

Q: The normal boiling point of Br2(l) is 58.8 ∘C, and it'smolar enthalpy of vapor Calculate the value…

A: The molar enthalpy of vaporization is 29.6 kJ/mol Temperature = 58.8 + 273 = 331.8 K

Q: The maximum amount of calcium phosphate that will dissolve in a 0.176 M sodium phosphate solution is…

A:

Q: Which of these reactions is expected to be spontaneous at all temperature?          (A

A: We have to tell which reactions is expected to be spontaneous at all temperature

Q: onsider the evaporation of methanol at 25.0 ∘C∘C: CH3OH(l)→CH3OH(g)CH3OH(l)→CH3OH(g). Find ΔrG at…

A:

Q: Here is the reaction of carbon monoxide and hydrogen to form gaseous methanol at 298 K. (a)…

A: (a) ∆S° = -219.2 J/K (b) Sign of ∆S° = -ve (c) ∆H° = -90.5 kJ (d) ∆G° = -ve ( spontaneous reaction )

Q: d)The ΔH°f of Ar(g) is   1.positive. 2.negative. 3.zero. 4.must be determined experimentally.…

A: The ΔH°f of Ar(g) is 1.positive. 2.negative. 3.zero. 4.must be determined experimentally

Q: For a particular chemical reaction DH = 6.8 kJ and DS = –29 J/K. Under what temperature condition is…

A: Gibbs Helmholtz Equation: Is the equation denoted by,…

Q: FeO

A: ∆H°rxn = [ ∆H°f(Fe2O3) ] - [ ∆H°f(FeO) + ∆H°f(Fe) + ∆H°f(O2) ]  ∆H°rxn = [ -822.16 kJmol-1 ] - […

Q: The addition of 121  g potassium fluoride to 591  mL of water (d = 1.00 g/mL) causes the temperature…

A: The mass of solution is calculated as shown,

Q: 3.) For each process, determine the sign of AS for the system: (a) decomposition of CaCO3(s) to give…

A: To solve this problem we have to determine the sign of ∆S  for the given system .

Q: Which of the following processes have ΔSsys > 0? (a) 2 NO(g) + O2(g) → 2 NO2(g) (b) methyl alcohol…

A:

Q: I Review Part A Standard Thermodynamic Quantities for Selected Substances at 25 °C Reactant The…

A:

Q: When heated, CaCO, decomposes into CaO and CO₂ according to the following equation: CaCO,(s)=CaO(s)+…

A: Given,CaCO3 (aq) + CO2 (g)

Q: The boiling point of ethanol is 173.1 F. In an experiment the entropy change for the reaction…

A:

Q: (Q69) Using the tabulated values from the text (located in Appendix G, beginning at p. 1211)…

A:

Q: 6. Photosynthesis can be represented by the equation 6CO:(g) + 6H,O(1I) = CH1,O6(s) + 60;(g) a)…

A: Entropy is the degree to measure the randomness of an element. The change in entropy of a reaction…

Q: Which substance has the higher entropy?(a) dry ice (solid CO2) at −78 °C or CO2(g) at 0 °C(b) liquid…

A: The substance which has higher entropy has to be predicted.

Q: Derive an expression for ΔS for an isothermal pressure change of an ideal gas. Then, calculate ΔS…

A:

Q: Calculate the standard free energy of formation (AGF) of the following compounds using the heats of…

A: Part a)   Part b)  Part c)   Part d)

Q: If ΔS ̊sys = -198.3 J/K, is the reaction spontaneous at 25 ̊C. -ΔSuniv = ΔSsys + ΔSsurr > ? -…

A: Enthalpy change of the reaction can be calculated as the difference between the enthalpy of…

Q: What is ΔHsys for a reaction at 16.9 °C with ΔSsurr = -159 J mol-1 K-1 ? Express your answer in kJ…

A: ΔSsurr & ΔHsys are related to each other as ΔSsurr = Where ΔSsurr is entropy change for…

Q: Consider the reaction 2 NO2(g)  N2O4(g) . (a) Using Gf N2O4(g) = 97.79 kJ/mol and Gf NO2(g) = 51.3…

A:

Q: For a certain chemical reaction, ∆H° = -35.4 kJ and ∆S° = -85.5 J>K. (a) Is the reaction…

A: The heat given off or absorbed in a chemical reaction is known as heat of the reaction. On the basis…

Q: Predict the sign of ΔSₛᵧₛ for each process: (a) Gasolinevapors mix with air in a car engine. (b) Hot…

A: Entropy is the measure of randomness.∆Ssys is positive, if the randomness increase and negative if…