Recent questions without a selected answer

0 votes

1 answer 38 views

Given the electrochemical reaction Zn(s) + Cu2+(aq) → Zn2+(aq) + Cu(s), calculate the standard cell potential at 25°C if the standard reduction potentials are E°(Cu2+/Cu) = 0.34 V and E°(Zn2+/Zn) = -0.76 V.

asked 2 days ago in ElectroChemistry by TerrellBejah (250 points)

0 votes

1 answer 48 views

Given the chemical equation: N2 + 3H2 <-> 2NH3 and an initial concentration of N2 as 0.1M, H2 as 0.2M, and NH3 as 0. Calculate the equilibrium concentrations of each component at 298K if the reaction is exothermic and the pressure is increased. (Hint: Use Le Chatelier's principle to determine the direction of the shift and then use an ICE table to calculate the concentrations at equilibrium)

asked 2 days ago in Chemical reactions by YasminDuncan (290 points)

0 votes

1 answer 43 views

Given the chemical equation for the oxidation of iron (Fe) to form iron(III) oxide (Fe2O3), determine the oxidation state of iron in both the reactant and product.

asked 2 days ago in Chemical reactions by ClariceOrozc (290 points)

0 votes

1 answer 32 views

Given the balanced equation for the electrochemical reaction: Cu(s) + 2AgNO3(aq) → Cu(NO3)2(aq) + 2Ag(s)Calculate the number of electrons transferred per copper atom during this reaction when a current of 5.00 A is passed for 6.00 minutes through a cell containing a copper electrode and a silver electrode with a silver ion concentration of 0.100 M.

asked 2 days ago in ElectroChemistry by DannySantora (590 points)

0 votes

1 answer 42 views

Given the balanced chemical equation: C6H12O6 + 6O2 -> 6CO2 + 6H2O The enthalpy of formation of glucose is -1273 kJ/mol and the enthalpy of formation of water is -286 kJ/mol. Calculate the enthalpy change of the oxidation of glucose in kJ/mol.

asked 2 days ago in ThermoChemistry by KianUlt79673 (330 points)

0 votes

1 answer 18 views

Given the balanced chemical equation: 2NO(g) + O2(g) ⇌ 2NO2(g)At a certain temperature, the concentrations of NO, O2, and NO2 are 0.4 M, 0.1 M, and 0.3 M respectively. What is the reaction quotient (Qc) for this chemical reaction? Is the reaction at equilibrium or not? If not at equilibrium, which direction will it shift to reach equilibrium?

asked 2 days ago in Chemical thermodynamics by OMSIsidra587 (450 points)

0 votes

1 answer 47 views

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 2 days ago in ThermoChemistry by IslaWoodward (530 points)

0 votes

1 answer 37 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 2 days ago in Computational Chemistry by JaniTinker23 (570 points)

0 votes

1 answer 28 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 2 days ago in Surface Chemistry by TrishaStanto (670 points)

0 votes

1 answer 47 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 2 days ago in ThermoChemistry by Shari7998231 (600 points)

0 votes

1 answer 32 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 2 days ago in Chemical kinetics by MellisaKrame (470 points)

0 votes

1 answer 6 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 2 days ago in Chemical engineering by TraceyBly383 (630 points)

0 votes

1 answer 42 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 2 days ago in ElectroChemistry by DessieWisnie (430 points)

0 votes

1 answer 40 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 2 days ago in Chemical thermodynamics by RussellOdoms (390 points)

0 votes

1 answer 43 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 2 days ago in ElectroChemistry by Ernestine878 (530 points)

0 votes

1 answer 37 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 2 days ago in ElectroChemistry by IrvinBonney (370 points)

0 votes

1 answer 29 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 2 days ago in ElectroChemistry by VivienScheff (510 points)

0 votes

1 answer 24 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 2 days ago in Surface Chemistry by MavisClawson (510 points)

0 votes

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)

0 votes

1 answer 33 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 2 days ago in Chemical thermodynamics by LeonardVande (430 points)

Recent questions without a selected answer

Categories