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What is the standard enthalpy change for the transition of ice to water if 50 grams of ice is heated from -10 °C to 50 °C? The molar mass of water is 18 g/mol and the specific heat capacity of ice and water are 2.09 J/g°C and 4.18 J/g°C, respectively.

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

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What is the step-by-step chemical process for synthesizing polyvinyl chloride from vinyl chloride monomer, and how can the purity and yield of the final product be optimized?

asked Feb 28 in Chemical synthesis by TheScientist (138k points)

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What is the standard enthalpy change for the reaction between copper sulfate pentahydrate and potassium hydroxide to form copper hydroxide and potassium sulfate, assuming all substances are in their standard state and the reaction occurs at 25°C?

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

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What is the standard enthalpy change for the reaction where 2 moles of hydrochloric acid react with 1 mole of magnesium hydroxide in aqueous solutions to produce 1 mole of magnesium chloride and 2 moles of water at 298 K and 1 atm pressure?

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

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What is the molar mass of Ba(NO3)2?

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

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Sure. What is the standard enthalpy change for the reaction of mixing 10g of ethyl alcohol (C2H5OH) with 25g of water (H2O) at 25°C, given that the heat evolved is 12.5 kJ?

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

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What is the rate of electroplating in a cell with a current of 2.5 A passing through it for 1 hour if the mass of the metal deposited on the cathode is 0.456 g? (assume a 100% yield and use the appropriate formula to calculate the rate).

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

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What would be the theoretical yield of 2,4-dinitrophenol if 10 grams of phenol was used in the preparation and 85% yield was obtained?

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

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What is the exchange current density (in A/cm2) for the reaction 2H+ + 2e- ⇌ H2 at a temperature of 298 K and a concentration of 0.1 M H+? Given that the standard potential of the half-cell reaction is 0 V, and the Tafel slope is 60 mV/decade.

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

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What is the standard enthalpy change for the reaction 2SO2(g) + O2(g) → 2SO3(g) at 25°C and 1 atm pressure, given the following enthalpy of formation values: ΔfH°[SO2(g)] = -296.8 kJ/mol, ΔfH°[O2(g)] = 0 kJ/mol, and ΔfH°[SO3(g)] = -395.72 kJ/mol?

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

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What is the heat capacity of 50 grams of water at a temperature of 25°C, given that the specific heat of water is 4.18 J/g•°C?

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

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What is the enthalpy change for the reaction: 2H2(g) + O2(g) → 2H2O(g), given that the bond enthalpy of H-H, O=O, and H-O are 436 kJ/mol, 498 kJ/mol, and 464 kJ/mol, respectively?

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

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1 answer 88 views

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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1 answer 92 views

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 magnetic moment of a tetrahedral complex with four ligands, each containing one unpaired electron, coordinated to a central transition metal ion with a d⁴ electron configuration?

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

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What is the surface area of a solid material (in m²/g) if it has a nitrogen gas adsorption of 0.52 cm³/g at a relative pressure of 0.1 and assuming a monolayer coverage?

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

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What is the Gibbs free energy change (ΔG) for the reaction NH3(g) + HCl(g) → NH4Cl(s) at standard conditions (298 K and 1 atm)? Show the steps taken to calculate ΔG using quantum chemistry calculations.

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

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What is the standard free energy change for the following redox reaction at 25°C?2Fe3+(aq) + Sn2+(aq) → 2Fe2+(aq) + Sn4+(aq) Given: E°(Fe3+/Fe2+) = 0.771 V E°(Sn4+/Sn2+) = 0.150 V R = 8.314 J/K•mol F = 96,485 C/mol

asked Mar 1 in Chemical thermodynamics 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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1 answer 87 views

What are the key components and their required amounts needed to design a cost-effective and high-performance system for the production of water-based interior wall paints with low VOC emissions?

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

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