Recent questions in Chemistry

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Given that the enthalpy of vaporization of water is 40.7 kJ/mol at its boiling point of 100°C, calculate the amount of energy required to boil 500g of water starting from 25°C.

asked Feb 4 in ThermoChemistry by JerrodLeidig (310 points)

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1 answer 49 views

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 Feb 4 in Computational Chemistry by MichealY7971 (410 points)

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1 answer 36 views

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 Feb 4 in Surface Chemistry by IngeDeBernal (450 points)

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1 answer 72 views

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 Feb 4 in ThermoChemistry by RethaBlundst (450 points)

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1 answer 45 views

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 Feb 4 in Chemical kinetics by KHUAugustus (470 points)

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1 answer 10 views

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 Feb 4 in Chemical engineering by CatherineTho (290 points)

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1 answer 56 views

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 Feb 4 in ElectroChemistry by RafaelStainf (470 points)

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1 answer 51 views

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 Feb 4 in Chemical thermodynamics by MarianaChung (390 points)

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1 answer 47 views

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 Feb 4 in ElectroChemistry by AmandaTauche (410 points)

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1 answer 46 views

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 Feb 4 in ElectroChemistry by SoilaRicker (430 points)

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1 answer 44 views

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 Feb 4 in ElectroChemistry by JeffereyHail (350 points)

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1 answer 27 views

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 Feb 4 in Surface Chemistry by HoracioPluml (370 points)

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1 answer 41 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 Feb 4 in Quantum Chemistry by TimothySuppl (350 points)

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1 answer 47 views

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 Feb 4 in Chemical thermodynamics by KateOliveira (330 points)

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1 answer 59 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 Feb 4 in Chemical thermodynamics by BrodieSherri (390 points)

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1 answer 61 views

Find the oxidation state of chromium in the compound K2Cr2O7.

asked Feb 4 in Chemical reactions by MelinaPrecia (250 points)

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1 answer 30 views

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

asked Feb 4 in Coordination Chemistry by SyreetaSwinf (330 points)

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1 answer 48 views

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

asked Feb 4 in Chemical education by SantosU99237 (510 points)

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1 answer 11 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 Feb 4 in BioChemistry by DominiqueLia (470 points)

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1 answer 51 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 Feb 4 in Coordination Chemistry by ZackRickel4 (330 points)

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