Recent questions in Chemistry

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1 answer 90 views

A chemistry student needs to calculate the heat of sublimation for iodine given that its enthalpy of fusion is 15.52 kJ/mol and its enthalpy of vaporization is 41.57 kJ/mol. The molar mass of iodine is 126.90 g/mol. What is the heat of sublimation for iodine in kJ/mol?

asked Jan 22 in ThermoChemistry by ChelseyWilbu (310 points)

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1 answer 51 views

A chemistry student needs to calculate the heat of hydration for the reaction between anhydrous magnesium chloride (MgCl2) and water (H2O) using the following data: the enthalpy change for the dissolution of anhydrous magnesium chloride in water is -63.3 kJ/mol, and the enthalpy change for the hydration of magnesium ions (Mg2+) and chloride ions (Cl-) is -192 kJ/mol and -131 kJ/mol, respectively. Calculate the overall heat of hydration (in kJ/mol) for the reaction: MgCl2(s) + 6H2O(l) → MgCl2.6H2O(s)

asked Jan 22 in ThermoChemistry by AntwanDelpra (470 points)

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1 answer 69 views

A chemistry student needs to calculate the equilibrium constant for the following reaction:2 H2O(g) ⇌ 2 H2(g) + O2(g)The student has the initial concentration of H2 and O2 as 0.25 M and the initial concentration of H2O as 1.00 M. After the system reaches equilibrium, the student measures the concentration of H2 as 0.10 M. Using this information, what is the value of the equilibrium constant, Kc, for the above reaction?

asked Jan 22 in Chemical reactions by HarrietBowke (330 points)

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1 answer 82 views

A chemistry student needs to calculate the equilibrium constant (Kc) for the reaction below at a certain temperature: N2(g) + 3H2(g) ⇌ 2NH3(g)Given the initial concentrations of N2, H2, and NH3 are 0.25 M, 0.1 M, and 0.1 M respectively, what is the value of Kc for this reaction at the given temperature?

asked Jan 22 in Chemical equilibrium by RosalinaAsht (310 points)

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1 answer 76 views

A chemistry student needs to calculate the enthalpy of adsorption of ammonia that is adsorbed on silica gel at a temperature of 298 K. The student is provided with the following information: - The partial pressure of ammonia in the gas phase is 0.5 atm- The initial temperature of the clean silica gel is 298 K- The final temperature of the adsorbed ammonia and silica gel mixture is 306 K- The mass of ammonia adsorbed on silica gel is 0.025 grams What is the enthalpy of adsorption of ammonia on silica gel at 298 K, in kJ/mol?

asked Jan 22 in ThermoChemistry by Darell07C87 (430 points)

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1 answer 91 views

A chemistry student needs to calculate the enthalpy of adsorption for NH3 gas onto a silica gel adsorbent. The mass of silica gel used is 5.00g and the initial temperature of the system is 298K. The student also measures the equilibrium pressure of the NH3 gas at 298K to be 0.222atm. To carry out the experiment, the student passes NH3 gas over the silica gel and waits until it reaches equilibrium. The temperature of the system is then measured to be 305K. Using this information, what is the enthalpy of adsorption of NH3 onto the silica gel adsorbent in kJ/mol?

asked Jan 22 in ThermoChemistry by EssieThiesse (190 points)

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1 answer 35 views

A chemistry student needs to calculate the density of a 25.0 mL sample of titanium (III) nitrate that has a mass of 34.6 g. The student needs to determine the density of the sample in g/mL, and also provide their answer in kg/m³.

asked Jan 22 in Inorganic Chemistry by AmparoHaygoo (250 points)

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1 answer 85 views

A chemistry student needs to calculate the concentration of copper(II) ions in a 250 mL solution, given that a current of 1.5 A was applied for 60 minutes to a copper electrode in contact with the solution. The initial concentration of copper(II) ions was 0.05 M, and the Faraday constant is 96,485 C/mol. What is the final concentration of copper(II) ions in the solution?

asked Jan 22 in ElectroChemistry by CamilleMedde (290 points)

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1 answer 48 views

A chemistry student needs to analyze the composition of a soil sample using elemental analysis. The student has to determine the percentage of carbon, nitrogen, and sulfur present in the sample. How can the student perform elemental analysis and calculate the percentage of each element in the soil sample accurately?

asked Jan 22 in Analytical Chemistry by RachaelBousq (210 points)

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1 answer 54 views

A chemistry student needs to analyze a water sample to determine the concentration of a certain contaminant. The student knows the initial concentration of the contaminant in the source water and the volume of the source water used to produce the final sample. Can the student use mass balance calculations to determine the concentration of the contaminant in the final water sample? If so, what is the concentration of the contaminant in the final sample?

asked Jan 22 in Analytical Chemistry by TuyetJeffers (290 points)

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1 answer 53 views

A chemistry student needs to analyze a sample of a mixture that consists of anionic and cationic species. Using capillary electrophoresis, determine the presence and concentration of each species in the sample. Additionally, suggest a suitable buffer system and optimize the electrophoresis conditions for efficient separation and detection of the species.

asked Jan 22 in Analytical Chemistry by BraydenHutch (450 points)

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1 answer 62 views

A chemistry student must determine the maximum work that can be done by a gas held in a container with a fixed volume and temperature. Given the number of moles of gas and the pressure inside the container, use statistical mechanics and thermodynamic ensembles to calculate the maximum work that can be extracted from the gas.

asked Jan 22 in Physical Chemistry by CandraDawbin (250 points)

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1 answer 67 views

A chemistry student must calculate the boiling point of a solution composed of 10 g of glucose (C6H12O6) dissolved in 100 g of water at 1 atm pressure. The boiling point elevation constant for water (Kb) is equal to 0.512°C/m, and the normal boiling point of pure water is 100°C.

asked Jan 22 in Physical Chemistry by AmyBurk87686 (690 points)

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1 answer 65 views

A Chemistry student is trying to determine the effect of changing the volume on the equilibrium position of a chemical reaction at constant temperature. If the reaction is initially in equilibrium in a 1 L container with a concentration of [X] = 0.10 M and [Y] = 0.20 M, and then the volume is decreased to 0.4 L, what will be the new equilibrium concentrations of X and Y at the new volume?

asked Jan 22 in Chemical equilibrium by NaomiCorbin6 (420 points)

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1 answer 63 views

A chemistry student is trying to determine the boiling point of a solution containing 30 grams of glucose (C6H12O6) dissolved in 100 grams of water. Given that the boiling point of pure water is 100°C and the elevation constant for water is 0.512°C/m, what is the boiling point of the solution?

asked Jan 22 in Physical Chemistry by KeriLoeffler (670 points)

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1 answer 99 views

A chemistry student is studying the reaction between hydrogen gas and iodine gas to form hydrogen iodide gas. The student has collected data on the concentration of hydrogen and the rate of reaction at different times. Using the collected data, calculate the rate constant of the reaction between hydrogen and iodine gas.

asked Jan 22 in Chemical kinetics by DZGDeclan47 (270 points)

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1 answer 69 views

A chemistry student is studying the Langmuir adsorption isotherm and wants to determine the monolayer coverage of a gas adsorbed on a solid surface. The student measures the amount of gas adsorbed at various pressures and at a constant temperature of 298 K. Using the Langmuir adsorption isotherm equation, what is the monolayer coverage of the gas on the surface at this temperature?

asked Jan 22 in Surface Chemistry by ColemanChart (590 points)

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1 answer 41 views

A chemistry student is studying the equilibrium reaction between nitrogen dioxide (NO2) and dinitrogen tetroxide (N2O4) and wants to test Le Chatelier's principle. They have a mixture of NO2 and N2O4 in a container. The student wants to determine the effect of temperature on the equilibrium position of the reaction. What temperature should the student use to shift the equilibrium towards the side with more NO2 gas?

asked Jan 22 in Chemical reactions by JannaNormanb (430 points)

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1 answer 44 views

A chemistry student is studying the adsorption of a gas on a solid surface using the Langmuir adsorption isotherm. The student knows that the maximum adsorption capacity (θ_max) of the surface is 0.5 mol/L and that the equilibrium constant (K) for the process is 0.02 L/mol. The student is asked to calculate the fraction of the surface covered by the adsorbate when the gas pressure is 2 atm at the temperature of the experiment.

asked Jan 22 in Surface Chemistry by ShaunCorner (390 points)

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1 answer 72 views

A chemistry student is required to determine the cathodic and anodic Tafel slopes for a reaction occurring at an electrode surface. The current density at the cathodic surface is known to be 1.8 mA/cm² and the current density at the anodic surface is known to be 1.2 mA/cm². The current potential relationship is given by the Tafel equation:log (i) = log (i0) + β_c * (E-E_c) for cathodic reactionlog (i) = log (i0) + β_a * (E-E_a) for anodic reactionWhere i is the current density, i0 is the exchange current density, β_c and β_a are the cathodic and anodic Tafel slopes respectively, E is the elect

asked Jan 22 in ElectroChemistry by FloraKorth37 (230 points)

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