Recent questions in Chemistry

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A chemistry student wants to find out the effect on the equilibrium position when the volume of a reaction mixture is changed. They have an equilibrium mixture of hydrogen and iodine gases forming hydrogen iodide gas according to the equation:$$H_2 (g) + I_2 (g) \leftrightharpoons 2HI (g)$$At 298 K, the equilibrium constant for this reaction is 54.3. Initially, the reaction mixture contains 0.5 moles of hydrogen gas, 0.5 moles of iodine gas, and 0 moles of hydrogen iodide gas in a container of volume 2L. If the volume is reduced to 1L while maintaining the temperature at 298 K, what wi

asked Jan 22 in Chemical equilibrium by BernadineRei (530 points)

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1 answer 63 views

A chemistry student wants to determine the surface area of a porous material using gas adsorption. The student has access to a BET specific surface area analyzer and pure nitrogen gas. What is the surface area of the porous material if the adsorption isotherm shows a monolayer formation at the partial pressure of nitrogen adsorption around 0.1?

asked Jan 22 in Surface Chemistry by DorrisChavez (210 points)

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1 answer 42 views

A chemistry student wants to determine the surface area of a metal oxide sample using the Langmuir adsorption isotherm. The student collects adsorption data at different pressures and determines the amount of gas adsorbed on the surface. The Langmuir isotherm equation used is y = Kx / (1 + Kx), where y is the fractional surface coverage, x is the pressure of the gas, and K is a constant related to the adsorption energy. The student obtains the following data:Pressure (atm) | Fractional surface coverage-------------|---------------------------

asked Jan 22 in Surface Chemistry by PiperDelano3 (250 points)

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1 answer 53 views

A chemistry student wants to determine the specific heat capacity of an unknown metal. The student performs a calorimetry experiment and records the following data: - 50 mL of water at 25°C was added to a calorimeter. - The initial temperature of the metal was 100°C. - The final temperature of the metal and water mixture was 30°C. - The mass of the metal was 100 grams.What is the specific heat capacity of the metal?

asked Jan 22 in ThermoChemistry by EmilSummerli (510 points)

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1 answer 37 views

A chemistry student wants to determine the specific heat capacity of a metal sample. The student adds 50 g of the metal sample to 200 g of water at 25°C in a calorimeter. The temperature of the water rises from 25°C to 38°C. Assume the specific heat capacity of water is 4.184 J/g°C. What is the specific heat capacity of the metal sample?

asked Jan 22 in ThermoChemistry by HungN507681 (410 points)

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1 answer 49 views

A chemistry student wants to determine the reaction rate of a chemical reaction. They mix 8 grams of reactant A with 12 grams of reactant B in a beaker at room temperature. After 10 seconds, they observe that the mass of the beaker's contents has decreased by 2 grams. What is the reaction rate of the chemical reaction?

asked Jan 22 in Chemical reactions by Misty66J260 (410 points)

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1 answer 44 views

A chemistry student wants to determine the rate constant for the reaction: 2NO(g) + Cl2(g) → 2NOCl(g) They measure the concentrations of all the reactants and products at different times and obtain the following data:Time (s) | [NO] (M) | [Cl2] (M) | [NOCl] (M):--: | :--: | :--: | :--:0 | 0.100 | 0.200 | 0.00010 | 0.080 | 0.180 | 0.04020 | 0.064 | 0.160 | 0.06430 | 0.051 | 0.140 | 0.08140 | 0.041 | 0.120 | 0.089What is the rate constant (k) for this reaction?

asked Jan 22 in Chemical kinetics by Catharine458 (290 points)

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1 answer 8 views

A chemistry student wants to determine the percentage of ethanol in a sample of wine. The student takes a 50 mL aliquot of the wine, dries it, and finds the weight of the residual solids to be 0.325 g. The student then distills the rest of the wine, evaporates the distillate to dryness, and finds the weight of the residue to be 2.324 g. Using mass balance calculations, what is the percentage of ethanol in the wine sample?

asked Jan 22 in Analytical Chemistry by NikiClint323 (430 points)

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1 answer 55 views

A chemistry student wants to determine the percent composition of calcium oxide in a given sample of limestone. The student does an experiment and obtains the mass of the limestone sample, the mass of carbon dioxide evolved upon heating the limestone, and the mass of calcium oxide left behind. Using mass balance calculations, determine the percent composition of calcium oxide in the limestone sample.

asked Jan 22 in Analytical Chemistry by MarinaDunne (350 points)

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1 answer 74 views

A chemistry student wants to determine the Faraday constant (F) by electroplating copper on a platinum electrode using a current of 2.0 A for 10 minutes. Calculate the amount of copper deposited and use this information to determine the value of the Faraday constant.

asked Jan 22 in ElectroChemistry by AKLEdna4181 (310 points)

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1 answer 69 views

A chemistry student wants to determine the enthalpy change of a chemical reaction. They have 25 g of sodium hydroxide and want to mix it with 50 mL of 1.0 M hydrochloric acid. What is the maximum temperature change they can expect to see, assuming constant pressure and perfect heat transfer, and what is the enthalpy change of the reaction?

asked Jan 22 in Physical Chemistry by DannyHankins (470 points)

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1 answer 42 views

A chemistry student wants to determine the effect of temperature on the ionization constant (Ka) of a weak acid. The initial Ka of the acid is 1.32 × 10^-6 at 25°C. If the temperature is increased to 35°C, calculate the new value of Ka for the weak acid.

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

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1 answer 87 views

A chemistry student wants to determine the effect of adding more reactant or product on the equilibrium position of a chemical reaction. The student has a 0.50 M solution of N2O4 and NO2 at equilibrium at 25°C, with the equation N2O4(g) <--> 2NO2(g). If the student adds more N2O4 to the reaction mixture, what will happen to the equilibrium concentration of NO2? Will it increase, decrease or stay the same? Justify your answer with a chemical equation and relevant calculations.

asked Jan 22 in Chemical equilibrium by ZCXMirta8905 (350 points)

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1 answer 56 views

A chemistry student wants to determine the effect of adding a buffer to a solution containing acetic acid (CH3COOH) and its conjugate base (CH3COO-), which is in equilibrium with its ionized form (H+ and CH3COO-). The initial concentration of acetic acid is 0.2 M and the pH of the solution is 4.5. If the student adds a buffer solution containing equal amounts of acetic acid and sodium acetate (NaCH3COO), what will be the new pH of the solution and the extent of shift in equilibrium position?

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

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1 answer 85 views

A chemistry student wants to determine the effect of adding a buffer solution on the equilibrium position of an acetic acid-sodium acetate reaction. The initial concentrations of acetic acid and sodium acetate are both 0.1 M and the pH of the solution is 4. Calculate the new concentrations of acetic acid, acetate ion, and hydrogen ion after adding a buffer solution containing 0.2 M acetic acid and 0.2 M sodium acetate. What is the new pH of the solution?

asked Jan 22 in Chemical equilibrium by ShawnaWylie (430 points)

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1 answer 83 views

A chemistry student wants to determine the concentration of copper(II) ions in a solution using electrochemical methods. The student prepares a copper electrode and a reference electrode, and sets up a cell with the copper electrode immersed in the solution and the reference electrode in the salt bridge. The standard cell potential is measured to be +0.34 V. If the student knows that the reduction of copper(II) to copper occurs at the copper electrode, what is the concentration of copper(II) ions in the solution?

asked Jan 22 in ElectroChemistry by LouieEck8295 (390 points)

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1 answer 58 views

A chemistry student wants to determine the concentration of a solution containing iron (III) ions. Using colorimetry, they measure the absorbance of the solution at a specific wavelength and plot a calibration curve with solutions of known iron (III) ion concentration. The student then measures the absorbance of their unknown solution at the same wavelength and uses the calibration curve to determine the concentration of iron (III) ions in the sample. What is the concentration of iron (III) ions in the unknown solution, in units of moles per liter?

asked Jan 22 in Analytical Chemistry by AugustinaHea (390 points)

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1 answer 61 views

A chemistry student wants to determine the bond enthalpy of hydrogen gas (H2). They have access to an experimental setup which can be used to measure the enthalpy change of a chemical reaction. How can the student determine the bond enthalpy of H2 using this setup?

asked Jan 22 in Chemical bonding by DCQVenetta9 (350 points)

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1 answer 46 views

A chemistry student wants to determine the boiling point of a solution of 25 g of glucose in 500 mL of water. Calculate the boiling point of the solution if the boiling point constant of water is 0.512 °C/m and assume an ideal solution.

asked Jan 22 in Physical Chemistry by GDZWillis962 (570 points)

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1 answer 71 views

A chemistry student wants to determine the amount of iron present in a sample of orange juice. The student takes a 50 mL sample of orange juice and reacts it with excess potassium dichromate in acidic solution. After the reaction, the remaining potassium dichromate requires 12.75 mL of a 0.015 M ferrous ammonium sulfate solution to complete the reaction. What is the mass of iron present in the sample of orange juice?

asked Jan 22 in Analytical Chemistry by Jess42409064 (170 points)

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