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Calculate the amount of heat released when 10.0 g of methane (CH4) is burned completely in excess oxygen if the enthalpy of combustion of methane is -890 kJ/mol.

asked Jan 23 in Physical Chemistry by 092347908024 (1.7k points)

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1 answer 108 views

A chemistry student needs to calculate the standard enthalpy change for the combustion reaction of methane (CH4) to produce carbon dioxide (CO2) and water (H2O) at 298 K. The student is given the following information: CH4(g) + 2O2(g) → CO2(g) + 2H2O(l) ΔH°rxn = -890.4 kJ/molThe enthalpy of formation of CH4(g) and H2O(l) are -74.8 kJ/mol and -285.8 kJ/mol, respectively. Using this data, what is the standard enthalpy change for the combustion reaction of methane (CH4) to produce carbon dioxide (CO2) and water (H2O) at 298 K?

asked Jan 22 in Chemical thermodynamics by KeithAnthon1 (1.9k points)

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Calculate the bond order of the nitrogen molecule (N2) using molecular orbital theory.

asked Jan 23 in Physical Chemistry by LorenzoWooll (1.7k points)

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Calculate the enthalpy change for the polymerization of ethylene to polyethylene if it is known that the heat of combustion of ethylene is -1411 kJ/mol and the enthalpy of formation of polyethylene is -248 kJ/mol. Assume that the reaction occurs at constant pressure and temperature of 25°C.

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

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Calculate the amount of heat (in joules) released when 50 ml of 0.1 M hydrochloric acid (HCl) is mixed with 50 ml of 0.1 M sodium hydroxide (NaOH) at a constant pressure and a temperature of 25°C. The heat of neutralization of HCl and NaOH is -57.1 kJ/mol.

asked Jan 23 in ThermoChemistry by JeremiahMoli (1.7k points)

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1 answer 66 views

Calculate the enthalpy change for the combustion of methane (CH4) at constant pressure, given that the heat of formation for methane is -74.9 kJ/mol and the balanced chemical equation is: CH4 (g) + 2O2 (g) -> CO2 (g) + 2H2O (l) The heat of formation for CO2 is -393.5 kJ/mol and the heat of formation for H2O is -285.8 kJ/mol.

asked Jan 23 in Chemical reactions by AdolphI79338 (1.8k points)

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1 answer 53 views

Calculate the heat of crystallization of 5 moles of calcium chloride, given that the enthalpy change of hydration of calcium ions is –1622 kJ/mol and that of chloride ions is –364 kJ/mol.

asked Jan 23 in ThermoChemistry by PeggyBednall (1.9k points)

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1 answer 54 views

Calculate the expected boiling point of lithium fluoride (LiF) using its experimental melting point and the heat of fusion, assuming it behaves ideally.

asked Jan 23 in Inorganic Chemistry by NataliaCaple (2.1k points)

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Calculate the enthalpy change of precipitation when 50 mL of 0.1 M calcium chloride solution is mixed with 50 mL of 0.1 M silver nitrate solution, assuming that the reaction goes to completion and the temperature remains constant at 25°C.

asked Jan 23 in ThermoChemistry by AudraNowlin6 (2.2k points)

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Calculate the heat of adsorption of hydrogen gas on a platinum surface given the initial temperature of the system is 298 K and the final temperature is 330 K. The mass of the platinum surface used is 5 grams, and the amount of hydrogen adsorbed is 0.01 moles. Assume the heat capacity of the system is constant at 25 J/K.

asked Jan 23 in ThermoChemistry by RobertoMundy (1.7k points)

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1 answer 63 views

Calculate the enthalpy change for the isomerization of butene-1 to butene-2 given that the heat of combustion of butene-1 and butene-2 are -2874 kJ/mol and -2854 kJ/mol respectively. Assume all reactants and products are in the gaseous state and that the reaction is carried out at constant pressure.

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

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1 answer 61 views

Calculate the enthalpy of desorption for the process of magnesium oxide (MgO) surface drying at a temperature of 500 K, given that the equilibrium pressure of water vapor above the dried MgO is 0.056 atm and the enthalpy of adsorption of water on MgO is -44.48 kJ/mol.

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

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1 answer 53 views

Calculate the heat capacity of 25 grams of liquid ethanol at 25°C when it is heated from 25°C to 35°C by absorbing 150 Joules of heat. The specific heat of ethanol is 2.44 J/g°C.

asked Jan 23 in Chemical thermodynamics by AgnesXyg5256 (2.0k points)

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1 answer 61 views

Calculate the enthalpy of combustion of ethane (C2H6) using the following information: The enthalpy of formation of C2H6 is -84.7 kJ/mol, the enthalpy of formation of CO2 is -393.5 kJ/mol, and the enthalpy of formation of H2O is -241.8 kJ/mol.

asked Jan 23 in ThermoChemistry by Carole803671 (1.8k points)

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1 answer 62 views

Calculate the enthalpy change of desorption of water from a graphite surface if the initial pressure of water is 10 torr and the final pressure is 1 torr at a constant temperature of 300 K. The surface area of the graphite is 50 cm² and the heat of adsorption of water on the surface is -40 kJ/mol.

asked Jan 23 in ThermoChemistry by SteveAdamson (1.7k points)

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1 answer 59 views

Calculate the enthalpy of oxidation of methane gas ($CH_4$) when it is burned completely in the presence of excess oxygen gas ($O_2$), given that the standard enthalpy of formation of $CH_4$ is -74.8 kJ/mol and the standard enthalpy of formation of $H_2O$ is -285.8 kJ/mol.

asked Jan 23 in ThermoChemistry by 43025337997 (2.2k points)

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1 answer 100 views

A student conducted an experiment to calculate the Faraday constant using a silver-copper voltaic cell. The masses of the copper and silver electrodes were 4.023g and 4.721g respectively. The cell was run for 782 seconds at a constant current of 0.250A. Calculate the value of the Faraday constant for this experiment.

asked Jan 22 in ElectroChemistry by Jaqueline50I (2.0k points)

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1 answer 61 views

Calculate the enthalpy of adsorption for the adsorption of nitrogen gas on activated carbon at 298 K, given that the partial pressure of nitrogen gas is 1.2 atm and the amount of adsorbate adsorbed per gram of adsorbent is 0.45 mol/g. The enthalpy of liquefaction of nitrogen gas at boiling point (-196 °C) is -5.58 kJ/mol.

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

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Calculate the enthalpy of adsorption for the adsorption of 5 grams of hydrogen gas on a solid adsorbent at a temperature of 298 K, if the pressure of hydrogen gas is 2.5 atm and the volume of the adsorbent is 100 cm3. Assume ideal gas behavior and use the equation ΔH = -q/n, where ΔH is the enthalpy of adsorption, q is the heat absorbed, and n is the number of moles of gas adsorbed.

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

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1 answer 68 views

Calculate the bond energy required to break the bond between atoms A and B in a molecule of AB, given the following information: the bond length between A and B is 0.1 nm and the energy required to break one mole of AB molecules is 500 kJ/mol.

asked Jan 23 in Chemical reactions by TBHMelaine51 (2.2k points)

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