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What is the standard enthalpy change of solution of 3.5 g of sodium hydroxide (NaOH) in 50 mL of water at a constant temperature of 25 °C?

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

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How do you design a chemical reactor to produce 10 kg/hr of product X with a yield of at least 90%, given a feed of 100 kg/hr of reactants A and B, and assuming a first-order reaction?

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

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What is the heat of sublimation of iodine, given that it has a vapor pressure of 10 mmHg at -10°C and a normal boiling point of 184.35°C?

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

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How can we design an efficient treatment system for the removal of toxic heavy metals from industrial wastewater, such as lead and mercury, using chemical precipitation methods?

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

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What is the standard cell potential for a galvanic cell made up of a silver electrode and a zinc electrode, where the concentration of silver ions is 0.01 M and the concentration of zinc ions is 1.0 M?

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

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How can we decrease the energy loss caused by the recombination of charged carriers in polymer-based photovoltaic materials, thereby improving their efficiency as solar cells?

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

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How can we create more engaging and interactive chemistry demonstrations that appeal to students and increase their interest in the subject?

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

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What is the standard enthalpy change for the vaporization of 50 g of water at its boiling point of 100°C? The molar heat of vaporization for water is 40.7 kJ/mol.

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

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What is the specific heat capacity of a substance that requires 2510 J of energy to increase the temperature of a 50 g sample by 10 °C?

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

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What is the formal charge of sulfur in the sulfate ion (SO4)^(2-) ? Show your calculations.

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

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How can we control the lifetime of the excited state in a phosphorescent material to increase its efficiency as a light-emitting material, and what factors affect the lifetime of the excited state?

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

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What is the rate of diffusion of oxygen in the air at standard temperature and pressure when the molecular weight of oxygen is 32 g/mol and the diffusion coefficient is 0.188 cm^2/s?

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

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In an electrochemical experiment, the anodic and cathodic Tafel slopes were found to be 100 mV/decade and 120 mV/decade, respectively. Calculate the value of exchange current density for the reaction.

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

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What is the probability that a system of two ideal gas particles in a closed container will have both particles in the same half of the container at a certain temperature? Use the canonical ensemble in statistical mechanics to calculate the probability.

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

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What is the Gibbs free energy change at 298 K for the reaction 2Fe2+(aq) + Cl2(g) --> 2Fe3+(aq) + 2Cl-(aq) if the standard electrode potentials for the half-reactions are E°(Fe3+(aq) + e- --> Fe2+(aq)) = -0.77 V and E°(Cl2(g) + 2e- --> 2Cl-(aq)) = 1.36 V?

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

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What is the power output of an electrochemical cell with a standard potential of +0.34 V and a current of 2.5 A flowing through it for 3 hours?

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

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What is the yield of acetylsalicylic acid obtained if 5 grams of salicylic acid and 10 grams of acetic anhydride are used in the preparation of acetylsalicylic acid through the reaction of esterification, assuming complete conversion?

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

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What is the standard enthalpy change for the reaction between hydrochloric acid (HCl) and sodium hydroxide (NaOH) in aqueous solutions when 25 mL of 2.0M HCl is mixed with 50 mL of 1.0M NaOH at 25⁰C and atmospheric pressure?

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

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What is the pH of a solution with a hydrogen ion concentration of 4.2 x 10^-5 M? Use a pH meter to determine the pH of the solution and compare it to the theoretical value calculated using the Henderson-Hasselbalch equation.

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

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What is the pH of a solution with a concentration of 0.1 M hydrochloric acid?

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

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