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A certain chemical reaction has a delta H value of -120 kJ/mol. If 2.5 moles of this reactant undergo the reaction, how much energy is released or absorbed by the reaction?

asked Jan 22 in ThermoChemistry by LaureneMcAle (2.8k points)

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1 answer 71 views

A brass alloy electrode with an area of 5 cm² is immersed in a 0.5 M NaCl solution at 25°C. Given that the standard potential of the electrode is -0.35 V versus a standard hydrogen electrode, calculate the corrosion current density of the electrode in the given environment using Tafel extrapolation.

asked Jan 22 in ElectroChemistry by DarbyKieran3 (2.4k points)

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A bottle contains a mixture of nitrogen and oxygen gases. At a specific temperature and pressure, the nitrogen molecules move on an average velocity of 500 m/s and oxygen molecules move at 400 m/s. What is the partial pressure of nitrogen and oxygen in the mixture if the total pressure of the gas is 1 atm?

asked Jan 22 in Physical Chemistry by ChristiCambe (2.1k points)

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A beaker of water is placed on a hot plate, and the temperature is gradually increased. Write an equation for the rate of change of entropy with respect to time during this process, assuming the system is not in equilibrium. Use the equation to determine the rate of entropy production in the water as it is heated from 25°C to 100°C at a constant rate of 2°C/min.

asked Jan 22 in Physical Chemistry by GlenCaringto (2.5k points)

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A beaker containing 1L of water is divided into two equal compartments by a semi-permeable membrane. One side of the membrane has 1M NaCl solution and the other side is pure water. Determine the time taken for the concentration of NaCl on both sides of the membrane to become equal through diffusion. Given: Molecular weight of NaCl is 58.44 g/mol, and diffusion coefficient of NaCl in water is 1.6 x 10^-9 m^2/s.

asked Jan 22 in Physical Chemistry by Ina75H680861 (3.2k points)

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1 answer 83 views

A battery consists of a Zinc electrode and a Copper electrode. Calculate the exchange current density at the Zinc electrode if the concentration of Zinc ion in its solution is 0.1 M and the potential difference between the electrodes is 1.5 V. The standard electrode potential for Zinc is -0.76 V and the transfer coefficient for the electrode reaction is 0.5.

asked Jan 22 in ElectroChemistry by BradCoz53277 (2.4k points)

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1 answer 93 views

A 50.0 g sample of ethanol is heated from 25.0 °C to 85.0 °C, and absorbs 237 J of heat. What is the specific heat capacity of ethanol?

asked Jan 22 in ThermoChemistry by DeneseSteinm (2.6k points)

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1 answer 75 views

A 50 mL solution of 0.1 M Cu(NO3)2 was electrolyzed for 20 minutes. During this time, a current of 0.5 A was passed through the solution. What is the final concentration of Cu2+ ions in the solution after the electrolysis?

asked Jan 22 in ElectroChemistry by SueCasteel38 (2.3k points)

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1 answer 70 views

A 5 g sample of a mixture containing sand and salt is dissolved in water. The solution is filtered, and the sand is collected and dried. The dried sand has a mass of 3 g. Using mass balance calculations, determine the percentage of salt in the original mixture.

asked Jan 22 in Analytical Chemistry by CorneliusChi (2.6k points)

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A 25 mL solution of 0.1 M AgNO3 is mixed with a 50 mL solution of 0.05 M NaCl. What is the mass of AgCl that will be produced if a reaction occurs? (Assume the reaction goes to completion.)

asked Jan 22 in Chemical reactions by BrandieB8434 (2.1k points)

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A 25 g sample of water at 25°C is heated by 200 J. The temperature of the water increases to 40°C. Calculate the specific heat capacity of water.

asked Jan 22 in Chemical thermodynamics by LuzGerste41 (2.4k points)

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1 answer 101 views

A 2.5 L container was initially filled with 0.1 M solution of nitrogen dioxide which decomposes into nitrogen monoxide and oxygen gas according to the following reaction:2NO2(g) ⇌ 2NO(g) + O2(g)After the system has reached equilibrium, the concentration of nitrogen monoxide is found to be 0.05 M. What is the equilibrium concentration of oxygen gas in the container?

asked Jan 22 in Chemical equilibrium by MaxwellDuff3 (2.3k points)

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1 answer 71 views

A 15.0 g sample of a mixture containing sodium chloride and sodium nitrate is dissolved in water, and then silver nitrate is added until no more precipitation occurs. The mass of the precipitate is found to be 20.4 g. What is the mass percentage of each component in the mixture?

asked Jan 22 in Analytical Chemistry by ArronXev3244 (2.3k points)

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1 answer 59 views

A 1.00 gram sample of sucrose (C12H22O11) is completely hydrolyzed in solution with excess HCl. If the solution is cooled to room temperature, what is the change in enthalpy ($\Delta H$) for the reaction? The heat capacity of the solution is 4.18 J/(g*K) and the temperature change is -10°C.

asked Jan 22 in ThermoChemistry by IvoryWithers (2.2k points)

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1 answer 64 views

A 0.50 L vessel contains 1.0 mol of N2(g) and 3.0 mol of H2(g) at equilibrium at 400 K according to the following equation:N2(g) + 3H2(g) ⇌ 2NH3(g)If the volume of the vessel is suddenly decreased to 0.25 L, what will happen to the equilibrium position? Will the concentration of NH3 increase or decrease? Calculate the new equilibrium constant at this new volume.

asked Jan 22 in Chemical equilibrium by MelbaTulloch (2.2k points)

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1 answer 70 views

A 0.25 mol/L solution of ethanoic acid (CH3COOH) is mixed with a 0.40 mol/L solution of sodium acetate (CH3COONa). The equilibrium constant for the reaction CH3COOH + NaCH3COO ⇌ CH3COONa + H2O is 1.8 x 10^-5. What is the concentration of CH3COONa at equilibrium?

asked Jan 22 in Chemical equilibrium by JoesphWoffor (2.3k points)

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1 answer 57 views

A 0.1 M solution of ammonia (NH3) has a pH of 11.64 at room temperature. If sodium hydroxide (NaOH) is added to this solution such that the concentration of OH- ions becomes 0.01 M, what will be the new pH of the solution? (Assume that the dissociation of water can be ignored)

asked Jan 22 in Chemical equilibrium by TawannaPigot (2.3k points)

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How would adding more reactants to a reaction at equilibrium affect the direction of the reaction and the equilibrium position, and what would be the quantitative effect on the equilibrium constant?

asked Jan 22 in Chemical equilibrium by BrandieB8434 (2.1k points)

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1 answer 68 views

How does the specific surface area of a solid catalyst affect the rate of reaction for the decomposition of hydrogen peroxide?

asked Jan 22 in Surface Chemistry by ErnestinaMus (2.1k points)

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1 answer 72 views

How does the coordination chemistry of metalloenzymes and metalloproteins contribute to their functionality in biological processes?

asked Jan 22 in Coordination Chemistry by IvyHogan8844 (2.2k points)

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