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What is the heat of hydration for MgSO4·7H2O, given that its enthalpy change per mole of hydration is -192 kJ/mol and 10 grams of MgSO4·7H2O is dissolved in 100 grams of water at 25°C?

asked Mar 1 in ThermoChemistry by TheScientist (138k points)

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What is the theoretical yield of acetylsalicylic acid that can be obtained from the reaction of 5 grams of salicylic acid and 10 mL of acetic anhydride, assuming complete reaction and 100% yield?

asked Mar 1 in Chemical synthesis by TheScientist (138k points)

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What is the standard enthalpy change for the reaction of [Fe(H2O)6]2+(aq) + 2Cl-(aq) → [FeCl4]2-(aq) + 6H2O(l)? Given the following bond enthalpies: Fe-Cl = 242 kJ/mol, O-H = 463 kJ/mol, and H-Cl = 431 kJ/mol.

asked Mar 1 in Chemical thermodynamics by TheScientist (138k points)

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What is the dipole moment of the polar molecule CHCl3?

asked Mar 1 in Chemical bonding by TheScientist (138k points)

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What is the standard enthalpy change for the reaction when 50 ml of 0.2 M hydrochloric acid is mixed with 50 ml of 0.1 M sodium hydroxide solution at 25°C? The specific heat capacity of the mixed solution is 4.18 J/g°C and the density is 1 g/mL.

asked Mar 1 in Chemical thermodynamics by TheScientist (138k points)

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What is the maximum amount of work that can be obtained from a reversible isothermal expansion of a gas at 25°C when the initial pressure is 4.00 atm and the final pressure is 1.00 atm and the initial volume of the gas is 3.00 L?

asked Mar 1 in Physical Chemistry by TheScientist (138k points)

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What is the rate of diffusion of carbon dioxide (CO2) gas in air at a temperature of 25°C and a pressure of 1 atm if the molar mass of CO2 is 44 g/mol?

asked Mar 1 in Physical Chemistry by TheScientist (138k points)

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What is the mass of 2,4-dinitrophenol that can be obtained from 5 grams of phenol and excess nitric acid using the preparation method to synthesize 2,4-dinitrophenol?

asked Mar 1 in Chemical synthesis by TheScientist (138k points)

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What is the surface area of a given sample of activated carbon powder, if it has adsorbed 12mL of nitrogen gas at 77 K and a pressure of 1 atm, and assuming the cross-sectional area of a nitrogen molecule to be 0.16 nm²?

asked Mar 1 in Surface Chemistry by TheScientist (138k points)

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What is the standard enthalpy change for the phase transition reaction of ice to water at 1 atm and 25°C? Given the enthalpies of fusion and vaporization of water as 6.01 kJ/mol and 40.67 kJ/mol, respectively.

asked Mar 1 in Chemical thermodynamics by TheScientist (138k points)

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What is the Gibbs free energy change for the electrochemical reaction involving the oxidation of copper, Cu, to copper (II) ions, Cu2+, in a solution of CuSO4 with a potential of 0.78 V at 25°C?

asked Mar 1 in ElectroChemistry by TheScientist (138k points)

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What is the yield of 2,4,6-trinitrotoluene that can be obtained if 500 mL of toluene is mixed with 700 mL of nitric acid (concentration 65%) and the reaction is carried out for 2 hours at a temperature of 60°C?

asked Mar 1 in Chemical synthesis by TheScientist (138k points)

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What is the standard enthalpy change for the fusion reaction of 10.0 grams of solid water (H2O) at 0°C into liquid water at 0°C, given the standard enthalpy of fusion for water is 6.01 kJ/mol?

asked Mar 1 in Chemical thermodynamics by TheScientist (138k points)

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What is the pH level of a 0.1 M solution of hydrochloric acid (HCl) measured using a pH meter?

asked Mar 1 in Analytical Chemistry by TheScientist (138k points)

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What is the standard free energy change for the following redox reaction at 298 K?Zn(s) + Cu2+(aq) → Zn2+(aq) + Cu(s)Given: E°(Cu2+/Cu) = 0.34 V and E°(Zn2+/Zn) = -0.76 V

asked Mar 1 in Chemical thermodynamics by TheScientist (138k points)

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How does changing the pH level of a solution affect the rate of a chemical reaction between (specific reactants) and (specific product)?

asked Mar 1 in Chemical kinetics by TheScientist (138k points)

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What are the reasons behind the difficulty in understanding the periodic table and the concept of chemical elements, and how can advanced mnemonic techniques be used to aid in memorizing the periodic table?

asked Mar 1 in Chemical education by TheScientist (138k points)

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What is the wavelength of the photon emitted when an electron in a hydrogen atom relaxes from the second excited state to the ground state using quantum chemical calculations of excited states?

asked Mar 1 in Computational Chemistry by TheScientist (138k points)

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What processing techniques can be used to manufacture polymer packaging products with enhanced mechanical properties and barrier properties against water vapor, oxygen, and other gases?

asked Mar 1 in Polymer Chemistry by TheScientist (138k points)

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What is the standard enthalpy change for the fusion of 50 grams of ice at 0°C to liquid water at 25°C, assuming constant pressure and no heat loss to the surroundings?

asked Mar 1 in Chemical thermodynamics by TheScientist (138k points)

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