Recent questions in ThermoChemistry

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1 answer 28 views

What is the bond dissociation energy (in kJ/mol) of the O-H bond in a water molecule if the energy required to break this bond is 464 kJ/mol?

asked Feb 18 in ThermoChemistry by RodolfoKello (2.0k points)

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1 answer 24 views

What is the bond dissociation energy of the carbon-hydrogen bond in methane?

asked Feb 18 in ThermoChemistry by ColinVanderm (2.0k points)

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1 answer 37 views

What is the bond dissociation energy of methane (CH4) at standard conditions (25°C and 1 atm)? Given that the enthalpy change of the reaction CH4(g) → C(g) + 4H(g) is 1665 kJ/mol.

asked Feb 18 in ThermoChemistry by MeganAndrzej (2.0k points)

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1 answer 33 views

What is the bond dissociation energy of the chlorine molecule (Cl2) in kilojoules per mole (kJ/mol)? Given that the bond length of Cl-Cl is 198 pm, and the enthalpy change for the reaction Cl2(g) -> 2Cl(g) is 242 kJ/mol.

asked Feb 18 in ThermoChemistry by ClaritaSifue (1.8k points)

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1 answer 30 views

Sure, here's a question for the student to solve:What is the bond dissociation energy (in kJ/mol) for the carbon-hydrogen bond in methane (CH4) given that the enthalpy change for the reaction CH4(g) → CH3(g) + H(g) is +435 kJ/mol?

asked Feb 18 in ThermoChemistry by BrandiBeer01 (2.4k points)

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1 answer 35 views

What is the bond dissociation energy of a carbon-carbon single bond in ethane (C2H6) given that the enthalpy change for the reaction C2H6(g) → 2CH3(g) is -84.68 kJ/mol?

asked Feb 18 in ThermoChemistry by Aimee8754791 (2.0k points)

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1 answer 32 views

What is the bond dissociation energy of a carbon-carbon triple bond in ethyne gas (C2H2)? Provide the calculation and units for your answer.

asked Feb 18 in ThermoChemistry by CarleyK5281 (2.0k points)

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1 answer 35 views

What is the enthalpy change for the combustion reaction of methane gas (CH4) when 2.50 moles of methane are burned in excess oxygen gas under standard conditions?

asked Feb 17 in ThermoChemistry by CecileHollin (2.3k points)

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1 answer 62 views

What is the amount of heat required to melt 10 g of ice at 0°C, given that the heat of fusion of water is 6.01 kJ/mol?

asked Feb 13 in ThermoChemistry by JoycelynFran (2.7k points)

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1 answer 76 views

What is the heat released when 25 grams of sodium hydroxide (NaOH) crystallizes out of a solution at its freezing point, given the enthalpy of fusion of NaOH is -44.51 kJ/mol? (Molar mass of NaOH = 40.00 g/mol)

asked Feb 13 in ThermoChemistry by AntonioDaven (1.7k points)

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1 answer 90 views

What is the enthalpy change when 10.0 g of sodium hydroxide dissolves in 200 mL of water at 25°C? The molar enthalpy of dissolution of sodium hydroxide is -44.5 kJ/mol.

asked Feb 13 in ThermoChemistry by JodieBaskett (1.8k points)

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1 answer 80 views

How many kJ of heat are released when 2.5 g of octane undergo complete combustion according to the reaction:$$C_8H_{18} + 12.5 O_2 \rightarrow 8 CO_2 + 9 H_2O$$Given: Enthalpy of combustion of octane = -5,470 kJ/mol.

asked Feb 13 in ThermoChemistry by DillonLeight (1.6k points)

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1 answer 57 views

What is the amount of heat released when 5 grams of NaCl is crystallized from its aqueous solution at 25°C, and the final temperature of the solution is -5°C? (Given: Heat of crystallization of NaCl = -3.92 kJ/mol)

asked Feb 13 in ThermoChemistry by MarciaBrooke (1.8k points)

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1 answer 66 views

What is the heat of hydration of magnesium sulfate, MgSO4, when 45 grams of the anhydrous salt is dissolved in 250 mL of water? The molar heat of hydration of MgSO4 is -138.5 kJ/mol.

asked Feb 13 in ThermoChemistry by Miguel37A006 (2.3k points)

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1 answer 139 views

Here's a precise problem for a chemistry student to solve, based on Thermochemistry and the Enthalpy of Desorption Calculations:Given the following data for the adsorption of hydrogen gas on a metal surface:- Initial pressure of hydrogen gas = 1 atm- Final pressure of hydrogen gas after adsorption = 0.2 atm- Temperature = 298 K- Surface area of the metal = 5 cm^2- Enthalpy of Desorption of hydrogen gas on the metal surface = -40 kJ/molCalculate the enthalpy change (in kJ) for the adsorption of hydrogen gas on the metal surface.

asked Feb 4 in ThermoChemistry by Beatris09Q13 (1.9k points)

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1 answer 75 views

Given the following information: A polymerization reaction has a heat of reaction of -150 kJ/mol and a Δn (change in moles of gas) of +2 moles gas/mol. If 5.0 g of the monomer is polymerized, what is the enthalpy change (in kJ) for the overall reaction?

asked Feb 4 in ThermoChemistry by ElenaBriscoe (2.1k points)

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1 answer 62 views

Given the enthalpy of solution of sodium hydroxide (NaOH) is -44.5 kJ/mol and the enthalpy of solution of hydrochloric acid (HCl) is -74.8 kJ/mol, calculate the enthalpy change for the precipitation reaction between NaOH and HCl, assuming all solutions are at a concentration of 1 M.

asked Feb 4 in ThermoChemistry by KatherinKely (1.8k points)

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1 answer 97 views

Given the balanced chemical equation: C6H12O6 + 6O2 -> 6CO2 + 6H2O The enthalpy of formation of glucose is -1273 kJ/mol and the enthalpy of formation of water is -286 kJ/mol. Calculate the enthalpy change of the oxidation of glucose in kJ/mol.

asked Feb 4 in ThermoChemistry by LidiaBautist (1.4k points)

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1 answer 81 views

Given that the enthalpy of vaporization of water is 40.7 kJ/mol at its boiling point of 100°C, calculate the amount of energy required to boil 500g of water starting from 25°C.

asked Feb 4 in ThermoChemistry by AshleighFleg (2.1k points)

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1 answer 97 views

Given a sample of dry ice (solid CO2) with a mass of 50 grams, calculate the amount of heat energy that needs to be added to sublimate it completely into gaseous CO2 at a temperature of -78.5°C. The heat of sublimation of CO2 is 25.2 kJ/mol. (Assume that CO2 is an ideal gas under these conditions.)

asked Feb 4 in ThermoChemistry by AbbeyBisson8 (1.9k points)

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