An iron nail is placed in a sealed glass jar filled with humid air (the "system").  After the nail rusts (reacts with oxygen to produce FeO3), the entropy of the system has decreased.  Aside: why?  What must have happened to the entropy of the universe?  How could this have happened even though the jar is sealed?

Q: Two different gases occupy the two bulbs shown here. Consider the process that occurs when the…

A: The enthalpy change, ∆Hmix value is 0 since at equilibrium enthalpy of mixing ideal gases is 0.

Q: Explain why the entropy change when a gase expads isothermally?

A: When the gas will expand isothermally  change in the internal energy is zero .

Q: Chemists will sometimes describe chemical reactions as being “enthalpy-driven” or “entropy-driven”.…

A: Spontaneity of a reaction is given is given by gibbs free energy. The mathematical expression is…

Q: ow as it ripens D. A&B C. Throwing 50 coins results in all tails 8. According to the third law of…

A: Third law of thermodynamics states that  Entropy of a pure substance at perfectly crystalline state…

Q: A box contains a helium gas with 15 helium atoms. Initially, 12 helium atoms are in the right…

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Q: Which of the following is true about the total entropy of the universe? A) It is always increasing…

A: Which of the statement is true about total entropy of the universe ?

Q: Will the entropy for each of the following be positive or negative?…

A: Entropy increases with increase in the disorder or randomness of the system. it is represented by…

Q: Calculate the standard entropy change for the combustion of propane, a common fuel. C3H8(g) + 502(g)…

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Q: What is the entropy change, in J mol1 K1, when 100.0 g of water boils at 100.0 °C? (AHvaporization…

A: Since the entropy change is given by  ΔS = ΔHvaporization / Tboiling point  where Tboiling point =…

Q: a) For the vaporization of a liquid at its boiling point, A(l) → A(g), is the entropy change of the…

A: The entropy tells the randomness present in the system due to its disorderness created in the system…

Q: Entropy changes cannot be measured with a calorimeter likê enth If the result upon calculation of…

A: 7. Entropy can be measured by using the formula, ∆S=qT Heat change can be measured calorimeter.…

Q: The third law of thermodynamics states that __________. A. ∆H°rxn = ∑n∆H°f (products) - ∑m∆H°f…

A: Entropy: "It is the measure of randomness of molecules of a closed system. It is denoted as 'S'."

Q: 4. Entropy can be represented mathematically by magnitude a. AS = -1 b. AS # 0 c. AS = +1

A: Gibbs Free energy (∆G) =∆H - T∆S where ∆H = Enthalpy change             T = Temperature           ∆S…

Q: which of the following is not accompanied by an increase in the entropy of the system? A. Boiling…

A: For any thermodynamic feasible process, increase in entropy should happen.

Q: Which substance has the greatest entropy, He(g) or Na(s)? Explainyour reasoning.

A: ENTROPY: Entropy is defined as a measure of the randomness or the disorderliness of a thermodynamic…

Q: For each system listed in the first column of the table below, decide (if possible) whether the…

A: Given:

Q: 00 mol He gas, regarded here as a perfect gas, und <pansion at 20.0 °C from 1 atm to 3 atm.…

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Q: Arrange the following sets of systems in order of increasing entropy. Assume one mole of each…

A: Entropy It is the measure of randomness or disorder of a system. Gaseous system is having high…

Q: What is entropy? What does it have to do with life and death?   Answer: If you place a…

A: 1. entropy, the measure of a system's thermal energy per unit temperature that is unavailable for…

Q: Consider two equal-sized flasks connected as shown in the figure. probability that it will be in…

A: a) Probability of finding a molecule in flask 2 is 1/2

Q: Calculate the absolute entropy, S° , per mole of 03 (g).

A: The enthalpy change of the given reaction can be calculated as,

Q: How does the entropy (S) of the system change when heating hydrogen gas from 60.0°C to 80.0°C?

A: Entropy is a measure or tendency in nature for systems to went towards a physical or chemical state…

Q: The accompanying diagram shows how entropy varies with temperature for a substance that is a gas at…

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Q: A mole of N2 is allowed to expand from 0.5L to 10L at constant Temerature . calcuate its Entropy ?

A: The simplest practical reversible method to be used to compute the entropy is isothermal pathway if…

Q: Consider the reaction between nitrogen and oxygen gas to form dinitrogen monoxide. 2 N2(g) + O2(g)…

A:

Q: Which of the following has the greatest molar entropy? All have the same O F2 () O F2 (s) O F2 (s)

A: Entropy: Entropy can be defined as the measurement of randomness or disorderness in the…

Q: te the change in entropy that occurs in the system when 3.20 mol of diethyl ether (C4H100) melts at…

A: Melting point (T) = - 116.3 0C                                = - 116.3 + 273.15…

Q: 2.6. The reaction COXg) H2(g)-> CO(g) + H20(g) is not spontaneous at room temperature but becomes…

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Q: For the following, under the same conditions of temperature and pressure, choose the one whose…

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Q: Describe the spontaneity and solve entropy of the processes. Sublimation of naphthalene balls as…

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Q: Which of the following descriptions about entropy is/are TRUE? I. It is positive for an isolated…

A: A question based on chemical thermodynamics that is to be accomplished.

Q: Explain why the entropy is higher for a system with 5 particles in 3 energy states than for a system…

A: Basically,entropy is a unit of randomness. More the randomness in the system,more will be its…

Q: At constant pressure, what is the value of entropy change? o C, -dT T nRln-

A: Option (2) CpdT

Q: What happens to the entropy of a sample of the matter when it changes state from a solid to a…

A: Entropy of a system is defined as the measure of randmnoss,or disorder. Entropy is an extensive…

Q: (a) What are the signs of ΔS and ΔH for the process depictedhere? (b) If energy can flow in and out…

A: Entropy(S) is a thermodynamic property which denotes the degree of disorder or randomness of the…

Q: b. How are the internal energies of chemical substances changed in a chemical reaction? State and…

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Q: You are observing a reaction and discover that the reaction vessel is warm to the touch.  The…

A: Interpretation: We have to tell whether the reaction is spontaneous or not.

Q: Do you need to specify the temperature to calculate the entropy change? Explain.

A: Entropy is the measure of randomness or chaoticness . With increasing in the randomness or…

Q: Is the entropy of a bag of popcorn greater than, less than, or equal to the entropy ofthe kernels of…

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Q: How does the entropy of the surroundings change duringan exothermic reaction? An endothermic…

A: Entropy of surrounding will increase during an exothermic reaction because heat is absorbed by…

Q: What is the entropy change, in J mol-1 K-1, when 100.0 g of water boils at 100.0 oC?…

A: The relation between deltaH vaporization and change in entropy is:

Q: Propanol 1C3H7OH2 melts at -126.5 °C and boils at 97.4 °C. Sketch how the entropy changes as…

A: Entropy is the measure of the randomness of the system. The entropy of the system increases for the…

Q: (a) What is a spontaneous process? Explain, with a simple quantitative example, why the flow of heat…

A: a.  A spontaneous process is the time-evolution of a system in which it releases free energy and it…

Q: The accompanying diagram shows how entropy varieswith temperature for a substance that is a gas at…

A: Entropy is the measure of the randomness. More the randomness , more the entropy. Thus , entropy of…

Q: What is entropy, and what is ΔS for a reaction, and what does it mean if ΔS is positive or negative?

A: Answer  The measurement of randomness is called entropy, entropy…

Q: Compare what will happen to the entropy of the whole system in the following two scenarios: A) if…

A: Oil is a substance made up of long hydrocarbon chain. That's why it is not soluble in water or do…

Q: Two moles of helium and three moles of argon are mixed at the same pressure and temperature. a)…

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Q: For each system listed in the first column of the table below, decide (if possible) whether the…

A: Entropy is a measure of randomness of a system.