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Calculate the amount of heat required to break all the bonds in 5 moles of carbon dioxide using the bond energy values for the C=O bond and the O-H bond.

asked Jan 23 in Chemical reactions by MacLgq130601 (2.4k points)

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1 answer 54 views

Calculate the change in enthalpy (ΔH) for the following reaction at 25°C given the standard enthalpies of formation for each compound: 2H2(g) + O2(g) → 2H2O(g) Standard enthalpies of formation: ΔHf° (H2O)(g) = -241.82 kJ/molΔHf° (H2)(g) = 0 kJ/molΔHf° (O2)(g) = 0 kJ/mol

asked Jan 23 in Physical Chemistry by TatianaSteil (2.3k points)

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1 answer 88 views

A sample of a white powder was analyzed in the laboratory and found to be composed of 40% carbon, 6.67% hydrogen, and 53.33% oxygen by mass. Determine the empirical formula of the compound.

asked Jan 22 in Inorganic Chemistry by BettyWalsh4 (2.0k points)

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Calculate the enthalpy change for the dissolution of 10g of NaCl in 100g of water, given that the initial and final temperatures are 25°C and 20°C respectively. The molar mass of NaCl is 58.44 g/mol and the specific heat capacity of water is 4.18 J/(g°C).

asked Jan 23 in ThermoChemistry by SenaidaDelac (1.8k points)

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Calculate the amount of heat absorbed or released when 20 grams of dry ice (solid carbon dioxide) is converted to gaseous carbon dioxide at -78.5°C and atmospheric pressure, given the heat of sublimation of dry ice is 25.2 kJ/mol.

asked Jan 23 in ThermoChemistry by MichelleHall (2.0k points)

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1 answer 54 views

Calculate the bond order of O2, O2+, O2- and O22-.

asked Jan 23 in Chemical bonding by VeroniqueBig (1.6k points)

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1 answer 90 views

A chemistry student wants to calculate the pH of a solution formed by mixing 100 mL of 0.1 M HCl with 200 mL of 0.05 M NaOH. What is the pH of the resulting solution?

asked Jan 22 in Inorganic Chemistry by MckinleyO01 (2.0k points)

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1 answer 90 views

A chemistry student wants to calculate the enthalpy of adsorption for the adsorption of nitrogen gas on a solid adsorbent. The student knows that the initial and final pressures of the nitrogen gas are 1 bar and 0.5 bar, respectively, and the surface area of the adsorbent is 2m^2/g. The student also has data on the temperature and the amount of nitrogen gas adsorbed on the adsorbent. Can you help the student calculate the enthalpy of adsorption?

asked Jan 22 in ThermoChemistry by AlfredLamb10 (2.1k points)

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1 answer 54 views

Calculate the bond order and bond length of the N-O bond in nitric oxide (NO) using molecular orbital theory.

asked Jan 23 in Inorganic Chemistry by Lachlan74F5 (2.0k points)

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1 answer 95 views

A chemistry laboratory is provided with a 10 mL solution containing a mixture of sodium chloride and potassium chloride. After adding an excess of silver nitrate, it has been observed that 0.476 grams of AgCl precipitate out. Determine the mass of each component (NaCl and KCl) in the original solution using mass balance calculations.

asked Jan 22 in Analytical Chemistry by JEAMolly3713 (2.3k points)

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Calculate the enthalpy change for the oxidation of 1 mole of methane gas to form carbon dioxide and water vapor, given the following balanced chemical equation: CH4(g) + 2O2(g) → CO2(g) + 2H2O(g)(enthalpy of formation: ΔHf(CH4)=-74.81 kJ/mol, ΔHf(CO2)=-393.51 kJ/mol, ΔHf(H2O)= -241.83 kJ/mol)

asked Jan 23 in ThermoChemistry by LawrenceShel (1.6k points)

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1 answer 53 views

Calculate the corrosion potential of a copper metal electrode in a 0.1 M CuSO4 solution at 25°C, given that the standard reduction potential of Cu2+/Cu is +0.34 V.

asked Jan 23 in ElectroChemistry by JackQ7308746 (2.0k points)

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1 answer 49 views

Calculate the enthalpy change for the isomerization of pentene-1 to pentene-2 if 2.5 g of pentene-1 is isomerized using a catalyst and the temperature increases from 25° C to 35° C. The heat capacity of the calorimeter is 15.6 J/deg and the density of the solution is 0.98 g/mL. Assume the heat capacity of the solution is equal to the heat capacity of water (4.18 J/g deg).

asked Jan 23 in ThermoChemistry by LucieFernand (2.0k points)

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1 answer 52 views

Calculate the energy required to break all the bonds in 1 mole of methane gas (CH4) at standard conditions, given that the bond energies of C-H and C-C bonds are 413 kJ/mol and 348 kJ/mol, respectively. Then, calculate the total energy released or absorbed during the combustion of 1 mole of methane gas with oxygen gas to form carbon dioxide gas and water vapor.

asked Jan 23 in Chemical reactions by MindyR870320 (1.6k points)

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1 answer 85 views

A student needs to determine the mass of silver that can be deposited on a silver electrode using a current of 2.5 A for 3 hours in a solution containing 0.2 M silver ions. What is the mass of silver deposited on the electrode? (Assuming 100% current efficiency and atomic weight of silver is 107.9 g/mol)

asked Jan 22 in ElectroChemistry by MuhammadNuna (2.1k points)

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1 answer 55 views

Calculate the area per molecule occupied by a monolayer of n-octadecane molecules adsorbed at the air-water interface assuming a surface pressure of 20 mN/m. The molecular weight of n-octadecane is 284.54 g/mol and its molecular area in the liquid phase is 0.219 nm². Use the Langmuir adsorption isotherm equation to solve the problem.

asked Jan 23 in Surface Chemistry by ElmoMcColl39 (1.7k points)

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1 answer 38 views

Calculate the heat of hydration when 10.0 g of calcium chloride (CaCl2) dissolves in 100 g of water at 25°C. The enthalpy of solution for calcium chloride is -81.5 kJ/mol.

asked Jan 23 in ThermoChemistry by EloisaLeavit (1.5k points)

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1 answer 93 views

A chemistry student needs to determine the conditions at which a pure substance will change from solid to liquid phase. The substance in question has a melting point of 120 °C and a heat of fusion of 35 kJ/mol. How much heat is required to melt 100 grams of the substance at its melting point? And, what is the temperature at which the substance will start to solidify if the ambient pressure is 1 atm and the substance has cooled from its liquid phase at 150 °C to its solid phase?

asked Jan 22 in Physical Chemistry by EusebiaGilla (1.8k points)

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1 answer 93 views

A chemistry student needs to determine the concentration of silver nitrate (AgNO3) in a given sample from the following information:- A 10 mL sample of 0.1 M sodium chloride (NaCl) was mixed with excess silver nitrate.- The resulting precipitate was filtered, washed, and dried. The mass of the precipitate was found to be 0.212 g.- The molar mass of AgNO3 is 169.87 g/mol.What is the concentration of AgNO3 in the original sample?

asked Jan 22 in Analytical Chemistry by Tesha44V4191 (1.7k points)

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Calculate the enthalpy of adsorption for a reaction where 2 moles of nitrogen gas (N2) are adsorbed on the surface of a solid at -100°C. Given that the partial pressure of N2 in the gas phase is 0.2 atm and the equilibrium constant for adsorption of N2 at this temperature is 2.5 x 10^3. Assume the adsorption is a reversible process and that the ideal gas law can be used to calculate partial pressures.

asked Jan 23 in ThermoChemistry by KraigFeldman (2.2k points)

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