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Given a transition metal complex composed of a central metal ion and a set of ligands, use ab initio calculations to determine the bond lengths, bond angles, and oxidation state of the metal ion. Additionally, calculate the electronic structure of the complex and predict its reactivity towards other molecules.

asked 2 days ago in Computational Chemistry by JaniTinker23 (570 points)

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Given a sample of mesoporous silica with a surface area of 500 m²/g, an amount of physisorbed nitrogen of 4.2 µmol/g, and assuming a monolayer coverage of 16.2 µmol/m², calculate the BET surface area of the silica.

asked 2 days ago in Surface Chemistry by TrishaStanto (670 points)

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Given a sample of dry ice (solid CO2) with a mass of 50 grams, calculate the amount of heat energy that needs to be added to sublimate it completely into gaseous CO2 at a temperature of -78.5°C. The heat of sublimation of CO2 is 25.2 kJ/mol. (Assume that CO2 is an ideal gas under these conditions.)

asked 2 days ago in ThermoChemistry by Shari7998231 (600 points)

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Given a reaction with the following data, calculate the rate constant (k) of the reaction:2 A + 3 B → CAt a particular temperature, the initial concentration of A was 0.2 M and the initial concentration of B was 0.5 M. After 30 minutes, the concentration of A decreased to 0.1 M while the concentration of B decreased to 0.3 M. The reaction is second order with respect to A and first order with respect to B.

asked 2 days ago in Chemical kinetics by MellisaKrame (470 points)

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Given a mixture of benzene and toluene, with a mole fraction of 0.6 and 0.4 respectively, design a distillation column with a reflux ratio of 2.5 to achieve a product purity of at least 99% for both components.

asked 2 days ago in Chemical engineering by TraceyBly383 (630 points)

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Given a half-reaction Cu2+(aq) + 2e- --> Cu(s) with an electrode potential of +0.34V and a half-reaction Fe3+(aq) + e- --> Fe2+(aq) with an electrode potential of +0.77V, what is the cell potential for the electrochemical reaction when Cu2+(aq) and Fe3+(aq) ions react to form Cu(s) and Fe2+(aq) ions?

asked 2 days ago in ElectroChemistry by DessieWisnie (430 points)

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Given a certain substance with a mass of 25 grams and an initial temperature of 25°C, if it absorbs 500 joules of heat energy, what is the final temperature of the substance? The heat capacity of the substance is 0.5 J/g·°C.

asked 2 days ago in Chemical thermodynamics by RussellOdoms (390 points)

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Given a certain electrochemical reaction, the anodic and cathodic Tafel slopes were found to be 60 mV/decade and 100 mV/decade, respectively. Calculate the exchange current density of the reaction.

asked 2 days ago in ElectroChemistry by Ernestine878 (530 points)

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For the reaction below, calculate the equilibrium constant (K) when the electrode potentials are E°(Cu2+/Cu) = +0.34 V and E°(Ag+/Ag) = +0.80 V:Cu(s) + 2Ag+(aq) → Cu2+(aq) + 2Ag(s)

asked 2 days ago in ElectroChemistry by IrvinBonney (370 points)

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For the electrochemical reaction + ↔ + , the cell potential is 0.60 V at 25°C. If the standard reduction potential of 2+ is 0.34 V and that of 2+ is -0.74 V, calculate the equilibrium constant () for the reaction at 25°C.

asked 2 days ago in ElectroChemistry by VivienScheff (510 points)

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For a student studying surface chemistry and the adsorption of gases on solid surfaces, a precise problem could be: What is the effect of temperature on the adsorption of nitrogen gas on activated charcoal and how does it change the isotherm?

asked 2 days ago in Surface Chemistry by MavisClawson (510 points)

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1 answer 26 views

For a given organic molecule with a Lewis structure, what is the frequency of infrared radiation that would induce the greatest change in the dipole moment of the molecule?

asked 2 days ago in Quantum Chemistry by LeonShimp55 (550 points)

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Find the standard enthalpy change for the reaction: 2C2H5OH(l) + 9O2(g) --> 6CO2(g) + 8H2O(l) given the following information: Standard enthalpy of formation (ΔHfº) of C2H5OH(l) = -277 kJ/mol Standard enthalpy of formation (ΔHfº) of CO2(g) = -393.5 kJ/mol Standard enthalpy of formation (ΔHfº) of H2O(l) = -285.8 kJ/mol Assume that the reaction occurs at standard conditions.

asked 2 days ago in Chemical thermodynamics by LeonardVande (430 points)

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1 answer 44 views

Find the standard enthalpy change for the formation reaction of methane gas (CH4) from its elements in their standard states, given the following standard enthalpy of formation values: ΔHf°[CH4] = -74.81 kJ/mol ΔHf°[H2] = 0 kJ/mol ΔHf°[C(graphite)] = 0 kJ/mol

asked 2 days ago in Chemical thermodynamics by NellOswalt1 (410 points)

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Find the oxidation state of chromium in the compound K2Cr2O7.

asked 2 days ago in Chemical reactions by EwanSales325 (330 points)

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Explore the relationship between the coordination number and the geometry of transition metal complexes, citing specific examples from the literature.

asked 2 days ago in Coordination Chemistry by MarciaCastel (570 points)

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Explain why some molecules with polar bonds are nonpolar in nature and provide a few examples.

asked 2 days ago in Chemical education by EdmundGopink (230 points)

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1 answer 6 views

Explain the role of ion channels in signal transduction pathways and provide an example of a specific ion channel and its function in cellular signaling.

asked 2 days ago in BioChemistry by AlexandraCru (510 points)

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1 answer 31 views

Explain the mechanism of chelation therapy with reference to coordination chemistry principles and discuss the effectiveness of EDTA as a chelating agent in the treatment of heavy metal poisoning.

asked 2 days ago in Coordination Chemistry by JulianeJeffe (570 points)

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Explain the factors affecting the stability of colloidal dispersion and the phenomenon of coagulation with suitable examples.

asked 2 days ago in Surface Chemistry by TereseTalbot (630 points)

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