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Calculate the enthalpy of combustion of ethanol (C2H5OH) if 45.1 g of ethanol is burned completely in excess oxygen, producing 145.5 kJ of heat energy.

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

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Calculate the enthalpy change (∆H) for the combustion reaction of methane gas (CH4) using Hess’s Law, when the enthalpy changes for the following reactions are given: Reaction 1: CH4 (g) + 2O2 (g) → CO2 (g) + 2H2O (l); ∆H = -891 kJ/mol Reaction 2: C (s) + O2 (g) → CO2 (g); ∆H = -393.5 kJ/mol Reaction 3: 2H2 (g) + O2 (g) → 2H2O (l); ∆H = -484 kJ/mol

asked Jan 23 in ThermoChemistry by SueCasteel38 (1.4k points)

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Calculate the Gibbs free energy change for the following reaction at 298 K:2CH4(g) + 3O2(g) → 2CO2(g) + 2H2O(g)Given the standard Gibbs free energy of formation at 298 K for CH4(g), O2(g), CO2(g) and H2O(g) are -50.8 kJ/mol, 0 kJ/mol, -394.4 kJ/mol, and -241.8 kJ/mol respectively.

asked Jan 23 in Chemical thermodynamics by AnnetteYbc3 (1.6k points)

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Calculate the heat of mixing (in kJ/mol) when 100 mL of 0.2 M HCl is added to 200 mL of 0.1 M NaOH at 25°C. Assume the density of the resulting solution is 1 g/mL and specific heat capacity is 4.18 J/(g*K). Also, assume the heat capacity of the solution is the same as water.

asked Jan 23 in ThermoChemistry by CesarSpragg2 (2.1k points)

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Calculate the enthalpy change for the hydrolysis of 2 moles of sucrose (C12H22O11) into glucose (C6H12O6) and fructose (C6H12O6) given the following information:- Enthalpy of formation of glucose = -1273 kJ/mol- Enthalpy of formation of fructose = -1260 kJ/mol- Enthalpy of formation of sucrose = -2226 kJ/mol

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

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Calculate the bond length between two carbon atoms in a molecule of ethene, given that the distance between the nuclei of the carbon atoms is 1.33 angstroms and the bond angle between the carbon atoms is 120 degrees.

asked Jan 23 in Chemical bonding by BrentonMcQua (1.7k points)

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Calculate the change in entropy when 1 mole of an ideal gas is compressed from 4 L to 1 L irreversibly at a temperature of 298 K.

asked Jan 23 in Physical Chemistry by MOIRoderick9 (1.8k points)

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Calculate the enthalpy change for the hydrolysis of 10 grams of sodium acetate (NaOH) at 25°C, given the following information:- The specific heat capacity of the solution is 4.18 J/(g·°C)- The initial temperature of the solution is 25°C- The final temperature of the solution after hydrolysis is 30°C- The heat evolved by the reaction is 677 J.

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

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Calculate the enthalpy change for the reaction: 2H2S(g) + 3O2(g) → 2H2O(g) + 2SO2(g) given the enthalpies of formation of H2O(g), SO2(g), and H2S(g) are -241.8 kJ/mol, -296.8 kJ/mol, and -20.2 kJ/mol, respectively.

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

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Calculate the heat of hydration for the dissolution of 5.00 grams of magnesium sulfate heptahydrate in 100.0 grams of water, given that the temperature rises from 25.0°C to 30.0°C. The molar mass of magnesium sulfate heptahydrate is 246.48 g/mol and the specific heat capacity of water is 4.18 J/g°C.

asked Jan 23 in ThermoChemistry by MOIRoderick9 (1.8k points)

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Calculate the lattice energy of MgO (magnesium oxide) given that the ionic charges of Mg and O are +2 and -2, respectively, and the distance between the ions is 2.1 Å.

asked Jan 23 in Inorganic Chemistry by Robin6937080 (1.9k points)

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Calculate the enthalpy of formation of So₃(g) using the given thermochemical equations:2SO₂(g) + O₂(g) → 2SO₃(g) ∆H = -197 kJ/mol2SO₂(g) + 2O₂(g) → 2SO₃(g) ∆H = -792 kJ/mol

asked Jan 23 in ThermoChemistry by BradCoz53277 (1.9k points)

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Calculate the dipole moment of carbon dioxide molecule and determine its polarity.

asked Jan 23 in Chemical bonding by KirstenLipsc (1.8k points)

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Calculate the lattice energy of CaO given the following information: the enthalpy of formation of CaO is -635 kJ/mol, the ionization energy of Ca is 590 kJ/mol, the electron affinity of O is -141 kJ/mol, and the Ca–O bond length is 2.23 Å.

asked Jan 23 in Inorganic Chemistry by StuartCarson (2.4k points)

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Calculate the enthalpy change when 50 ml of 0.2 M sodium chloride solution is mixed with 50 ml of 0.1 M silver nitrate solution. Given the enthalpy of precipitation of silver chloride as -64.8 kJ/mol.

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

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1 answer 47 views

Calculate the lattice energy of calcium fluoride (CaF2) given that the lattice enthalpy of formation of Ca2+ is +178 kJ/mol, the lattice enthalpy of formation of F- is -328 kJ/mol and the distance between the Ca2+ and F- ions is 231 pm.

asked Jan 23 in Inorganic Chemistry by ChastityHoll (1.8k points)

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Calculate the heat of formation of carbon dioxide (CO2) using the following information: The heat of formation of carbon monoxide (CO) is -110.5 kJ/mol and the heat of formation of water (H2O) is -285.8 kJ/mol.

asked Jan 23 in Chemical bonding by CaitlynTulab (1.2k points)

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1 answer 51 views

Calculate the enthalpy of vaporization of water at a temperature of 100 degrees Celsius and a pressure of 1 atm, given that the boiling point of water is 100 degrees Celsius and its enthalpy of vaporization at standard conditions (100 degrees Celsius and 1 atm) is 40.7 kJ/mol.

asked Jan 23 in ThermoChemistry by SOYRyan09176 (1.6k points)

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1 answer 92 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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Calculate the cell potential for the following electrochemical reaction: Cu(s) + 2 Ag⁺(aq) → Cu²⁺(aq) + 2 Ag(s) Given that the standard reduction potentials are: Cu²⁺(aq) + 2e⁻ → Cu(s) E° = +0.34 V Ag⁺(aq) + e⁻ → Ag(s) E° = +0.80 V

asked Jan 23 in ElectroChemistry by AundreaWhitf (1.8k points)

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