Hot questions

0 votes

1 answer 42 views

Calculate the monolayer capacity and specific surface area of a sample of silica gel using BET theory. The sample was found to have a weight of 2.56 g and a total surface area of 260 m²/g. The gas used for adsorption was nitrogen at a temperature of 77 K and a pressure range of 0.01-0.3 P/P₀. The plot of (P/P₀)/(V₀/V) versus P/P₀ generated a straight line with a slope of 4.2×10⁻³.

asked Feb 3 in Surface Chemistry by OrenDarwin6 (1.9k points)

0 votes

1 answer 48 views

How does changing the concentration of reactants affect the rate of reaction and its sustainability in a chemical reaction between hydrogen peroxide and potassium iodide?

asked Feb 3 in Chemical kinetics by CarissaNevil (1.8k points)

0 votes

1 answer 34 views

Calculate the standard enthalpy change for the precipitation reaction that takes place when 25.0 mL of 0.250 M barium chloride (BaCl2) and 50.0 mL of 0.100 M sodium sulfate (Na2SO4) react to form a precipitate of barium sulfate (BaSO4). The density of each solution is 1.00 g/mL and the specific heat capacity is 4.18 J/g°C. Assume a constant temperature of 25°C.

asked Feb 3 in Chemical thermodynamics by MonikaQuirk7 (2.0k points)

0 votes

1 answer 33 views

Calculate the standard enthalpy change for the reaction: 2C2H5OH(l) + 9O2(g) -> 6CO2(g) + 8H2O(l) given that the standard enthalpy of formation for C2H5OH(l) is -278 kJ/mol, for CO2(g) is -394 kJ/mol and for H2O(l) is -286 kJ/mol.

asked Feb 3 in Chemical thermodynamics by IolaHolly818 (2.0k points)

0 votes

1 answer 41 views

Calculate the polarization that occurs in an electrochemical cell when a current of 2 A flows through it for 10 minutes. The electrode area is 25 cm², and the current efficiency is 95%. The activation energy is 80 kJ/mol, and the reaction quotient is 2.5 x 10⁻⁵. The temperature of the cell is 25°C. Find the polarization resistance and the total polarization of the cell.

asked Feb 3 in ElectroChemistry by AleciaAlleyn (1.5k points)

0 votes

1 answer 46 views

How does changing the pH of a redox reaction involving copper and zinc affect the equilibrium position and which ion, Cu2+ or Zn2+, is favored?

asked Feb 3 in Chemical equilibrium by IsabellaOcto (1.9k points)

0 votes

1 answer 31 views

Calculate the standard free energy change (ΔG°) for the following reaction at 25°C: 2Fe2+(aq) + Cu2+(aq) -> 2Fe3+(aq) + Cu+(aq) (Standard reduction potentials: Fe3+(aq) + e- -> Fe2+(aq) E° = 0.77 V Cu2+(aq) + e- -> Cu+(aq) E° = 0.16 V)

asked Feb 3 in Chemical thermodynamics by LovieCastles (2.3k points)

0 votes

1 answer 29 views

Consider the following chemical equation: 2 SO2(g) + O2(g) ⇌ 2 SO3(g)At equilibrium, the concentration of SO2 was found to be 0.10 M, the concentration of O2 was found to be 0.20 M, and the concentration of SO3 was found to be 0.30 M. What is the value of the equilibrium constant (Kc) for this reaction at the given temperature?

asked Feb 3 in Chemical equilibrium by AngeliaDewey (1.8k points)

0 votes

1 answer 45 views

How does changing the reactant concentrations in a chemical reaction affect the rate of reaction and the reaction stoichiometry? Provide experimental evidence to support your answer using the reaction between potassium iodide and hydrogen peroxide.

asked Feb 3 in Chemical kinetics by BelenPickard (2.3k points)

0 votes

1 answer 38 views

Calculate the standard electrode potential for the redox reaction: Fe3+(aq) + e- → Fe2+(aq) given that the standard reduction potential for the Fe3+(aq)/Fe2+(aq) couple is +0.77 V.

asked Feb 3 in Chemical thermodynamics by ChristelIdr7 (1.7k points)

0 votes

1 answer 29 views

Consider the chemical equation: Fe + H2SO4 → FeSO4 + H2 What is the coefficient of Fe when the equation is balanced using the smallest whole number coefficients?

asked Feb 3 in Chemical reactions by ElviaBumgarn (1.8k points)

0 votes

1 answer 38 views

Calculate the standard electrode potential for the redox reaction that occurs when a silver electrode is placed in a solution containing 0.1 M Ag+ ions and a platinum electrode is placed in a solution containing 0.1 M H+ ions at standard conditions. The reduction half-reaction for Ag+ is Ag+ (aq) + e- → Ag(s), and the reduction half-reaction for H+ is H+ (aq) + e- → 1/2 H2 (g).

asked Feb 3 in Chemical thermodynamics by RogerDenning (2.4k points)

0 votes

1 answer 32 views

Calculate the standard enthalpy change for the vaporization of 25.0 g of water at 100°C, given that the molar enthalpy of vaporization is 40.7 kJ/mol.

asked Feb 3 in Chemical thermodynamics by Georgianna69 (2.2k points)

0 votes

1 answer 31 views

Calculate the standard enthalpy of formation of water if you know that the standard enthalpy of combustion of hydrogen is -286 kJ/mol and the standard enthalpy of combustion of oxygen is -394 kJ/mol.

asked Feb 3 in Chemical thermodynamics by ZellaSeamon3 (1.6k points)

0 votes

1 answer 35 views

Calculate the standard enthalpy change for the dissolution of 10 grams of potassium hydroxide (KOH) in 100 mL of water. Given that the molar enthalpy of dissolution of solid KOH is -57.61 kJ/mol and the density of water is 1 g/mL.

asked Feb 3 in Chemical thermodynamics by EdwardoO6191 (2.5k points)

0 votes

1 answer 29 views

Consider a closed system undergoing an irreversible expansion at constant pressure, calculate the change in entropy of the system if the initial and final volumes are V1 and V2, respectively, and assuming ideal gas behavior.

asked Feb 3 in Physical Chemistry by CarleyK5281 (2.0k points)

0 votes

1 answer 47 views

What is the effect of changing the concentration of reactants on the rate of a chemical reaction and how does it impact the sustainability of the reaction?

asked Feb 3 in Chemical kinetics by CarissaNevil (1.8k points)

0 votes

1 answer 46 views

How does changing the initial orientation of reactant molecules affect the rate of a chemical reaction?

asked Feb 3 in Chemical kinetics by QAMSibyl4514 (2.0k points)

0 votes

1 answer 47 views

What is the effect of changing the concentration of reactants on the rate of reaction and the corresponding safety hazards in a given chemical reaction?

asked Feb 3 in Chemical kinetics by ErnestinaMus (1.9k points)

0 votes

1 answer 28 views

Consider the redox reaction 2Fe^2+(aq) + H2O2(aq) + 2H^+(aq) ⟷ 2Fe^3+(aq) + 2H2O(l). If a catalyst is added to the reaction mixture at equilibrium, will the concentration of Fe^3+ increase, decrease or remain the same? Justify your answer mathematically.

asked Feb 3 in Chemical equilibrium by SGDJenifer99 (2.0k points)

Categories