Recent questions in Chemistry

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Given the following equilibrium reaction: Fe3+(aq) + 4CN-(aq) <--> Fe(CN)64-(aq)If the equilibrium constant, Kc, is equal to 1.2 x 10^10 at 25°C, what will be the value of Kc at 50°C? And how will the equilibrium position shift when the temperature is changed from 25°C to 50°C?

asked 2 days ago in Chemical equilibrium by JolieTristan (460 points)

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1 answer 28 views

Given the following equations and their respective enthalpy changes:1) 2H2 (g) + O2 (g) → 2H2O (l) ΔH = -484 kJ/mol 2) C2H5OH (l) + 3O2 (g) → 2CO2 (g) + 3H2O (l) ΔH = -1,367 kJ/mol 3) C2H5OH (l) → C2H4 (g) + H2O (g) ΔH = +44 kJ/mol Using Hess’s Law, determine the ΔH for the following reaction: C2H5OH (l) → 2CO2 (g) + 3H2 (g)

asked 2 days ago in Chemical reactions by BonnieEdens (370 points)

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1 answer 48 views

Given the following electrochemical reaction: Cu(s) + 2 Ag+(aq) → Cu2+(aq) + 2 Ag(s)Calculate the cell potential at standard conditions (298 K, 1 atm, 1 M concentrations).

asked 2 days ago in ElectroChemistry by ClaudiaGut87 (400 points)

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1 answer 32 views

Given the following electrochemical equation:Cu(s) | Cu²⁺(aq, 0.0100 M) || Cr³⁺(aq, 1.00 M) | Cr(s)At 298 K, the standard reduction potential for Cu²⁺/Cu is +0.34 V and for Cr³⁺/Cr is -0.74 V. Calculate the equilibrium constant (K) for the above electrochemical reaction.

asked 2 days ago in ElectroChemistry by ConcettaMira (500 points)

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1 answer 29 views

Given the following data for the electrochemical reaction A + B → C, where A and B are electrons:- The anodic Tafel slope is 50 mV per decade of current density.- The cathodic Tafel slope is 70 mV per decade of current density.Calculate the exchange current density (i0) for the reaction.

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

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1 answer 24 views

Given the equilibrium reaction: 2NOCl(g) ⇌ 2NO(g) + Cl2(g), if the equilibrium constant (Kc) at 25°C is 2.45 x 10^-3, what will be the new value of Kc if the temperature is increased to 50°C?

asked 2 days ago in Chemical equilibrium by GQABrian353 (650 points)

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1 answer 49 views

Given the equilibrium equation N2(g) + 3H2(g) ⇌ 2NH3(g), if the concentration of N2 is increased by 0.2 M while the temperature is held constant, what will be the effect on the equilibrium concentration of NH3?

asked 2 days ago in Chemical equilibrium by JinaEhrlichm (410 points)

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1 answer 35 views

Given the enthalpy of solution of sodium hydroxide (NaOH) is -44.5 kJ/mol and the enthalpy of solution of hydrochloric acid (HCl) is -74.8 kJ/mol, calculate the enthalpy change for the precipitation reaction between NaOH and HCl, assuming all solutions are at a concentration of 1 M.

asked 2 days ago in ThermoChemistry by MeghanIliffe (430 points)

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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)

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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)

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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)

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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)

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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)

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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)

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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)

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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)

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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)

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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)

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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)

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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)

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