3.14 The change in Gibbs energy that accompanies the com-bustion of C6H12O6(s) to carbon dioxide and water vapour at25 °C is -2828 kJ mol-1. The potential energy of an object ofmass mat a height h, relative to that at the Earth's surface isgiven by mgh, where g = 9.81 ms-2 is the acceleration of freefall. How much glucose does a person of mass 65 kg need toconsume to climb through 10 m?

Step 1:The question asks how much glucose a person of weight 65kg needs to consume to climb through…

Answered: 3.14 The change in Gibbs energy that…

Chemistry: The Molecular Science

5th Edition

ISBN:9781285199047

Author:John W. Moore, Conrad L. Stanitski

Publisher:John W. Moore, Conrad L. Stanitski

Chapter16: Thermodynamics: Directionality Of Chemical Reactions

Section: Chapter Questions

Problem 121QRT

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(b) (i) Mixtures of molten salts often result in high excess mixing enthalpies. Calorimetric experiments of a 25:75 mixture of NaCl and KCl revealed an enthalpy of mixing ΔmixH of -0.4095 kJ mol-1 . Calculate β for this mixture. (ii) Aluminium boils at 2737 K at 100.0 kPa pressure. Given that at 100.0 kPa the molar heat capacity (Cp) of liquid aluminium is 29.30 J K-1 mol-1 , and of aluminium gas is 20.79 J K-1 mol-1 , calculate the total entropy change for the reaction: Al(liquid, 2000 K) → Al (gas, 3500 K). ΔvapS = 49.24 J K-1 mol-1
In a particular biokgikal reaction taking place in the body at 37 C, the change in enthalpy was -125 kJ mol' and the change in entropy was -126 JK' mol". (a) Cakulate the change in Gibbs energy. (b) Is the reaction spontaneous? (e) Cakulate the total change in entropy of the system and the surroundings.
The reduction of iron(III) oxide (Fe,0,) to pure iron during the first step of steelmaking, 2 Fe,0, (s) – - 4 Fe(s) + 30,() is driven by the high-temperature combustion of coke, a purified form of coal: 圖 C(s) + 0,(g) → Co, (g) dlo Suppose at the temperature of a blast furnace the Gibbs free energies of formation AG, of CO, and Fe, O, are -428. kJ/mol and -833. kJ/mol, respectively. Calculate the minimum mass of coke needed to produce 2000. kg of pure iron. Round your answer to 2 significant digits. Okg Explanation Check O 2021 McGraw-Hill Education. AlI Rights Reserved. Terms of Use| Privacy | Accessibility
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3.(10p) The molar volume of a certain solid is 142.0 cm3mol-1 at 1.00 atm and 427.15 K, its melting temperature. The molar volume of the liquid at this temperature and pressure is 152.6 cm3mol-1. At 1.2 MPa, the melting. temperature changes to 429.26K. Calculate the enthalpy and entropy of fusion of the solid using the Clapeyron equation.
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The reduction of iron(III) oxide (Fe2O3) to pure iron during the first step of steelmaking, 2 Fe2O3(s) 4Fe(s) + 302 (g) is driven by the high-temperature combustion of coke, a purified form of coal: C(s) + O2(g) - - CO2(g) Suppose at the temperature of a blast furnace the Gibbs free energies of formation AG of CO2 and Fe2O3 are -428. kJ/mol and -821. kJ/mol, respectively. Calculate the minimum mass of coke needed to produce 680. t of pure iron. (One metric ton, symbol t, equals 1000 kg.) Round your answer to 2 significant digits.
5.
(b) What is Hess law? Several reactions and their standard reaction enthalpies at 298.15 K are given here: all k mat Ca+ 1/20s - C 435.1 65.2 The standard enthalpies of combustion of graphite and C2H2(g) are -393.51 and -1299.58 kJ mol-, respec- tively. Calculate the standard enthalpy of formation of CaC2(s) at 25°C.
(3A) Calculate the Gibbs free energy of mixing for 50.0 g water and 50.0 g ethanol at constant 298 K and1.00 bar. What is it about your answer that tells vou that this mixing is spontaneous?AmixG = NRT (x1 In x1 + x2 In x2)
4.5(b) When a certain liquid freezes at –3.65°C its density changes from 0.789 g cm-3 to 0.801 g cm¯³. Its enthalpy of fusion is 8.68 kJ molH. Estimate the freezing point of the liquid at 100 MPa.
The reduction of iron(III) oxide (Fe2O3) to pure iron during the first step of steelmaking, 2 Fe2O3(s) 4 Fe(s) + 302 (g) is driven by the high-temperature combustion of coke, a purified form of coal: C(s) + 0,(g) → CO₂ (g) Suppose at the temperature of a blast furnace the Gibbs free energies of formation AG, of CO2 and Fe2O3 are -412. kJ/mol and -836. kJ/mol, respectively. Calculate the minimum mass of coke needed to produce 470. t of pure iron. (One metric ton, symbol t, equals 1000-kg.) Round your answer to 2 significant digits. kg x10

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