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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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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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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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1 answer 68 views

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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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 61 views

How does the CYP3A4 enzyme affect the metabolism and potential interactions of commonly prescribed drugs in the treatment of cardiovascular disease?

asked Jan 22 in Medicinal Chemistry by AnibalX1615 (1.9k 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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How do the coordination chemistry principles of chelation therapy contribute to the removal of toxic metal ions from the human body?

asked Jan 22 in Coordination Chemistry by AlanCoover5 (2.2k points)

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1 answer 13 views

How can we use the knowledge of the chemical makeup of different viruses to design drugs that target their specific characteristics and prevent infection?

asked Jan 22 in Medicinal Chemistry by Steffen8339 (1.8k points)

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1 answer 13 views

How can computational chemistry be used to design new metal-organic frameworks with optimal properties for carbon capture and storage?

asked Jan 22 in Computational Chemistry by DeboraMccomb (1.9k points)

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1 answer 57 views

How does increasing the temperature affect the rate of reaction between sodium thiosulfate and hydrochloric acid?

asked Jan 22 in Chemical kinetics by AnnKetner183 (2.2k points)

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1 answer 71 views

What is the pH of 0.1 M solution of HCl knowing that its dissociation constant is 1.3 x 10^-4?

asked Jan 22 in Inorganic Chemistry by IsabellFrome (2.3k points)

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