Recent questions in ThermoChemistry

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1 answer 64 views

Calculate the amount of energy required to vaporize 100 grams of liquid water at its boiling point (100°C) given its enthalpy of vaporization is 40.7 kJ/mol.

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

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1 answer 80 views

Calculate the amount of energy required to melt 50 grams of ice at 0°C, given the enthalpy of fusion for water is 6.01 kJ/mol.

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

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1 answer 70 views

Calculate the amount of energy required to completely desorb 2 moles of hydrogen molecules from a metal surface if the enthalpy of desorption for each H2 molecule is 436 kJ/mol.

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

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1 answer 75 views

Calculate the amount of energy needed to desorb 10 moles of hydrogen gas from a metal surface, given that the enthalpy of desorption is -120 kJ/mol.

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

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1 answer 79 views

Calculate the amount of energy in Joules required to melt 15 grams of ice at 0°C, given that the heat of fusion of water is 334 J/g.

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

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1 answer 68 views

Assuming standard conditions, calculate the standard enthalpy of combustion of methane (CH4), given that the standard enthalpies of formation of CH4 and H2O are -74.8 kJ/mol and -285.8 kJ/mol, respectively. The balanced chemical equation for the combustion of CH4 is:CH4(g) + 2O2(g) → CO2(g) + 2H2O(l) What is the standard enthalpy change (ΔH°) for this reaction?

asked Jan 22 in ThermoChemistry by AguedaD83620 (2.6k points)

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1 answer 19 views

Assuming complete combustion, what is the amount of heat energy released when 25 grams of methane (CH4) is burned completely in oxygen gas (O2)? The enthalpy of combustion for methane is -890.4 kJ/mol.

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

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1 answer 95 views

A student wants to synthesize a polymer using the monomer vinyl chloride. The reaction is exothermic and produces a polymer with an average molecular weight of 50,000 g/mol. The enthalpy change of polymerization for this reaction is -121.8 kJ/mol. How much heat is liberated during the polymerization of 1 mol of vinyl chloride?

asked Jan 22 in ThermoChemistry by CorneliusChi (1.6k points)

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1 answer 133 views

A student wants to prepare polyethylene using the radical polymerization process. The monomer used is ethylene, and the reaction occurs at a temperature of 60°C. The initiator used is benzoyl peroxide. The student wants to know the enthalpy change that occurs during the polymerization process. How can the student calculate the enthalpy of polymerization using the given information?

asked Jan 22 in ThermoChemistry by 540252730007 (1.9k points)

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1 answer 119 views

A student wants to measure the heat of crystallization of sodium acetate trihydrate. The student takes 50 g of sodium acetate trihydrate and dissolves it in 100 ml of water at 70°C. The solution is then allowed to cool to 20°C, during which the sodium acetate trihydrate crystallizes out. The student measures the temperature change during this process and finds that the temperature drops to 45°C. What is the heat of crystallization of sodium acetate trihydrate in kJ/mol?

asked Jan 22 in ThermoChemistry by CarrieMadiso (1.8k points)

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1 answer 70 views

A student wants to determine the enthalpy of combustion of octane. They measured the temperature change of 200 mL of water in a calorimeter when 1.50 grams of octane was burned completely. The initial temperature of the water was 25.0 °C and it reached a maximum of 45.0 °C. What is the enthalpy of combustion of octane?

asked Jan 22 in ThermoChemistry by JereGerald1 (1.6k points)

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1 answer 109 views

A student needs to prepare a solution containing 50 g of ethanol (C2H5OH) dissolved in 250 g of water (H2O) at 25°C. Assuming the heat of mixing for ethanol and water is -5.02 kJ/mol, calculate the heat released or absorbed when the two substances are mixed. Express your answer in kJ.

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

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0 answers 114 views

A student needs to prepare a solution containing 50 g of ethanol (C2H5OH) dissolved in 250 g of water (H2O) at 25°C. Assuming the heat of mixing for ethanol and water is -5.02 kJ/mol, calculate the heat released or absorbed when the two substances are mixed. Express your answer in kJ.

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

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1 answer 90 views

A student needs to find the enthalpy of polymerization of ethylene from the enthalpies of combustion of ethylene gas (-1411 kJ/mol) and polyethylene (-5120 kJ/mol). Calculate the enthalpy change, in kJ/mol, for the polymerization of ethylene gas to form polyethylene.

asked Jan 22 in ThermoChemistry by TracieM73151 (2.5k points)

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1 answer 101 views

A student needs to find out how much heat is released or absorbed when 100 mL of 0.1 mol/L solution of barium chloride (BaCl2) is mixed with 150 mL of 0.1 mol/L solution of sodium sulfate (Na2SO4) at 25°C. Given the enthalpy of precipitation of BaSO4 as -256 kJ/mol, calculate the enthalpy change (in kJ) for the reaction that occurs and determine whether the reaction is exothermic or endothermic.

asked Jan 22 in ThermoChemistry by BrainRubin29 (2.2k points)

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1 answer 94 views

A student needs to determine the enthalpy change (ΔH) for the reaction between ammonium nitrate (NH4NO3) and water (H2O) using Hess's Law calculations. Given the following information: - ΔHf° (NH4NO3) = -365.4 kJ/mol- ΔHf° (HNO3) = -207.3 kJ/mol- ΔHf° (NH4+) = -132.5 kJ/mol- ΔHf° (NO3-) = -206.1 kJ/mol- ΔHf° (H2O) = -285.83 kJ/molFormulate the thermochemical equation for the reaction by using the given data and Hess's Law calculations, and then calculate the enthalpy change for the reaction.

asked Jan 22 in ThermoChemistry by LeannaCremea (1.6k points)

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1 answer 133 views

A student needs to calculate the standard enthalpy of formation of magnesium oxide, MgO, using Hess's Law. The student has access to the following reactions and their corresponding enthalpy changes:1. Mg(s) + 1/2O2(g) → MgO(s) ΔH = -601.8 kJ/mol2. Mg(s) + 2HCl(aq) → MgCl2(aq) + H2(g) ΔH = -450.7 kJ/mol3. H2(g) + 1/2O2(g) → H2O(l) ΔH = -285.8 kJ/molWhat is the standard enthalpy of formation of MgO from its elements?

asked Jan 22 in ThermoChemistry by Marlene31P52 (2.5k points)

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1 answer 128 views

A student needs to calculate the standard enthalpy change of combustion for propane using Hess's Law. They have the following information: C3H8(g) + 5O2(g) → 3CO2(g) + 4H2O(l) ΔH° = -2220 kJ/mol 2H2(g) + O2(g) → 2H2O(l) ΔH° = -484 kJ/mol 3C(s) + 2H2(g) → C3H8(g) ΔH° = +51 kJ/mol What is the standard enthalpy change of combustion for propane?

asked Jan 22 in ThermoChemistry by ReinaldoBull (2.2k points)

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1 answer 133 views

A student needs to calculate the heat of mixing for a 50 mL solution containing 0.1 M HCl and 0.1 M NaOH. The temperature of the solution is 25°C and the density is 1 g/mL. The enthalpy of neutralization for HCl and NaOH is -57.3 kJ/mol. Determine the heat of mixing for the solution.

asked Jan 22 in ThermoChemistry by VictorinaWoz (1.9k points)

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1 answer 97 views

A sample of 55.0 g of ethanol at 25°C is vaporized at its normal boiling point. The enthalpy of vaporization for ethanol is 38.56 kJ/mol. Calculate the amount of heat energy required for this process.

asked Jan 22 in ThermoChemistry by CamillePiazz (1.8k points)

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