Recent questions in Chemistry

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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 LeonieCross (490 points)

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1 answer 58 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 LandonZfs700 (150 points)

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1 answer 56 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 GroverGreenw (430 points)

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1 answer 58 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 MiaWelker055 (310 points)

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1 answer 51 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 EmmaHouck317 (910 points)

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1 answer 44 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 KHIRachelle2 (450 points)

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1 answer 51 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 ThaliaEsmond (470 points)

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1 answer 41 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 EmiliaOddo6 (230 points)

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1 answer 42 views

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

asked Jan 22 in Coordination Chemistry by GeorgiaHatfi (490 points)

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1 answer 32 views

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 ChadwickDalz (290 points)

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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 LeesaStrub9 (240 points)

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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 JacquettaFor (470 points)

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1 answer 46 views

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

asked Jan 22 in Chemical kinetics by MorrisCurran (270 points)

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1 answer 54 views

A chemical mixture containing 30% ethanol and 70% water needs to be separated using a distillation column. The feed rate is 1000 kg/hr and the desired purity for both products is 99%. The distillation column has 20 theoretical trays, and the reflux ratio is 2.5. Determine the number of trays required to achieve the desired purity for both products.

asked Jan 22 in Chemical engineering by SteveSantiag (630 points)

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1 answer 8 views

A chemical engineering firm has been tasked with designing a chemical reactor for the synthesis of ammonia gas from nitrogen and hydrogen gases. The plant requires a production of at least 1000 kg/h of ammonia gas, and the reactor should operate at a pressure of 200 atm and a temperature of 400°C. The student should determine the optimal size and design of the reactor by considering the reaction kinetics, thermodynamics, and fluid dynamics principles. The student should also select appropriate catalysts and determine the flow rate of the reactants required to achieve the desired production rate.

asked Jan 22 in Chemical engineering by AndrewMcKenn (410 points)

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1 answer 54 views

A chemical engineering company has a mixture of ethanol and water with a concentration of 30% ethanol to separate using a distillation column. The company needs to obtain a concentration of 80% ethanol in the distillate at a reflux ratio of 3. Calculate the number of theoretical plates required in the column for the separation, assuming no vapor or liquid bypass, and that the minimum vapor velocity is maintained.

asked Jan 22 in Chemical engineering by PhillipBussa (790 points)

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1 answer 71 views

A chemical engineer wants to separate a mixture of ethanol and methanol using a distillation column. The feed to the column contains 30% ethanol and 70% methanol by mole. The engineer wants to obtain a distillate with 80% ethanol and a bottoms product containing no more than 1% ethanol. Determine the number of trays required in the distillation column to achieve this separation. Consider only equilibrium stages and assume that the feed is saturated liquid at its boiling point. The operating pressure of the column is 1 atm.

asked Jan 22 in Chemical engineering by JaniNolen204 (410 points)

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1 answer 29 views

A chemical engineer needs to separate a mixture of ethanol and water using a distillation column. The feed to the column has 30 mol% ethanol and 70 mol% water, and the desired distillate composition is 95 mol% ethanol. The feed rate is 100 kmol/hour and the reflux ratio is 2. Calculate the number of theoretical trays required in the column to achieve the desired distillate composition.

asked Jan 22 in Chemical engineering by KarlaZaragoz (450 points)

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1 answer 58 views

A chemical engineer needs to design a distillation column for the separation of a mixture containing ethanol (boiling point of 78.4°C) and water. The desired composition of the distillate is a minimum of 90% ethanol. What is the minimum number of theoretical trays needed in the column to achieve this composition, given that the feed contains 40% ethanol and the reflux ratio is 1.5?

asked Jan 22 in Chemical engineering by JennieCrumle (190 points)

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1 answer 41 views

A certain polymerization reaction has a ΔH°rxn of -250 kJ/mol. If you need to make 500 grams of the polymer, how much energy in kilojoules will be released or absorbed during the reaction?

asked Jan 22 in ThermoChemistry by EzekielMock0 (230 points)

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