Recent questions in Chemistry

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A gas phase reaction occurs according to the following equation: A(g) + 2B(g) -> C(g) + D(g)The reaction is carried out at a total pressure of 2 atm and at 298 K. The initial concentrations of A and B are 0.1 M and 0.2 M, respectively. The rate of formation of C is measured to be 0.02 M/s. What is the rate of disappearance of B?

asked Jan 22 in Physical Chemistry by AnnmarieMcCl (550 points)

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A gas mixture contains equal parts of hydrogen and helium gases in a container at a temperature of 300 K. Determine the total internal energy of the gas mixture using the grand canonical ensemble model.

asked Jan 22 in Physical Chemistry by Jeramy133586 (450 points)

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1 answer 52 views

A gas is contained in a cylinder at a pressure of 1 atm and a temperature of 25°C. The cylinder is fitted with a piston that can be moved to change the volume. The gas is allowed to expand irreversibly to a final pressure of 0.5 atm, and the temperature is kept constant. Calculate the work done by the system, and determine if the process is endothermic or exothermic.

asked Jan 22 in Physical Chemistry by DanieleKavel (390 points)

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A galvanic cell has a standard emf of 1.10 V at 298 K. If this cell runs for 25 minutes with a constant current of 0.25 A, what is the amount of energy produced in joules? (Assume the cell is operating under standard conditions.)

asked Jan 22 in ElectroChemistry by Samual94V215 (570 points)

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1 answer 63 views

A galvanic cell consists of a standard hydrogen electrode (SHE) as the cathode and a copper electrode as the anode. The measured potential difference between the two electrodes is 1.23 V. Using Tafel analysis, calculate the anodic and cathodic Tafel slopes for the copper electrode.

asked Jan 22 in ElectroChemistry by GonzaloHowit (350 points)

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1 answer 9 views

A droplet of water weighing 0.2 grams is placed on the surface of a perfectly clean glass plate. The diameter of the droplet is measured to be 5 mm. Calculate the surface tension of water in dynes/cm.

asked Jan 22 in Surface Chemistry by DoreenBurrou (370 points)

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1 answer 7 views

A cylinder with a volume of 2.5 L contains 1.5 moles of an ideal gas at a pressure of 5 atm. The gas is allowed to expand isothermally against a constant external pressure of 1 atm until the volume doubles. Calculate the work done by the gas during the expansion process.

asked Jan 22 in Physical Chemistry by DTQDianna989 (330 points)

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1 answer 67 views

A current of 2.5 amperes was passed through molten silver chloride for 5 hours. What mass of silver metal will be deposited? (The atomic mass of silver = 107.87 g/mol)

asked Jan 22 in ElectroChemistry by DanaLanham1 (450 points)

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1 answer 49 views

A copper wire is exposed to a solution containing 0.2 M NaCl. The corrosion rate of the wire is found to be 5.8 microAmp/cm². Calculate the corrosion current density of the copper wire in the given environment.

asked Jan 22 in ElectroChemistry by DannyKalb466 (690 points)

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1 answer 47 views

A copper rod with a surface area of 5 cm² is coupled with an iron rod with a surface area of 10 cm² to form a galvanic cell. When the circuit is closed, the current flows for 2 hours and the weight loss of the iron rod was found to be 0.58 g. Determine the corrosion rate of the iron rod in millimeters per year (mm/yr) assuming a density of 7.86 g/cm³ for the iron.

asked Jan 22 in ElectroChemistry by MiraLardner (490 points)

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1 answer 49 views

A copper electrode is placed in a 1.0 M Cu(NO3)2 solution while a silver electrode is placed in a 1.0 M AgNO3 solution. If the cell potential is measured to be 0.74 V at standard state conditions, what is the equilibrium constant for the reaction Cu(s) + 2Ag+(aq) ⇌ Cu2+(aq) + 2Ag(s)?

asked Jan 22 in ElectroChemistry by PeggyStreit (230 points)

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1 answer 8 views

A copper electrode is immersed in a 0.1M solution of CuSO4 and a zinc electrode is immersed in 0.1M solution of ZnSO4. Both the solutions are connected with a salt bridge. If the standard reduction potentials of Cu2+/Cu and Zn2+/Zn are +0.34V and -0.76 V respectively, calculate the potential difference between the two electrodes at 25°C.

asked Jan 22 in ElectroChemistry by StormyDesroc (310 points)

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1 answer 80 views

A container initially contains 0.10 mol of NOBr, 0.10 mol of NO, and 0.10 mol of Br2. If the system reaches equilibrium and the concentration of NOBr is found to be 0.075 M at that point, calculate the concentration of NO and Br2 at equilibrium.

asked Jan 22 in Chemical equilibrium by PatrickWoodd (570 points)

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1 answer 65 views

A container has a mixture of nitrogen and oxygen gases at equilibrium. If the temperature of the container is increased, predict the direction in which the equilibrium will shift according to Le Chatelier's principle and explain why.

asked Jan 22 in Chemical reactions by Otto41M9339 (250 points)

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1 answer 61 views

A container contains 2 moles of a gas at a pressure of 8 atm and a temperature of 300 K. Calculate the volume of the gas in each of the following thermodynamic ensembles: microcanonical, canonical, and grand canonical ensembles.

asked Jan 22 in Physical Chemistry by DexterAlfaro (410 points)

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1 answer 7 views

A container at room temperature contains two gases, oxygen, and nitrogen. The container has a small hole that allows gas molecules to escape. If the hole is big enough, which gas will escape faster and why? Calculate the ratio of their rates of effusion.

asked Jan 22 in Physical Chemistry by ReyesBoettch (490 points)

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1 answer 7 views

A compound contains 42.8% carbon, 14.3% hydrogen, and 42.9% oxygen by mass. Determine its empirical formula.

asked Jan 22 in Inorganic Chemistry by JoleenGoethe (490 points)

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1 answer 77 views

A compound contains 29.5% sodium, 41.1% sulfur, and 29.4% oxygen by mass. Determine the empirical formula of the compound.

asked Jan 22 in Inorganic Chemistry by KaiC2325731 (330 points)

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1 answer 38 views

A compound containing only potassium and chlorine has a mass of 74.55 grams. When this compound was analyzed, it was found to have 37.43 grams of potassium and 37.12 grams of chlorine. Determine the empirical and molecular formulas of this compound.

asked Jan 22 in Inorganic Chemistry by MittieStuder (370 points)

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1 answer 64 views

A chemistry student was given a sample of an unknown compound. The student performed an analysis on the sample using mass balance calculations and obtained the following data: the sample had a mass of 2.64 g and contained 1.32 g of carbon, 0.22 g of hydrogen, and 0.88 g of oxygen. What is the molecular formula of the unknown compound?

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

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