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Calculate the bond dissociation energy of the O-H bond in a water molecule (H2O) given the enthalpy change for the reaction:H2O (g) → H2 (g) + 1/2 O2 (g)ΔH = +483.6 kJ/mol(Note: the bond dissociation energy represents the energy required to break a bond into its constituent atoms.)

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

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1 answer 103 views

A student performed an experiment in which 2.1 moles of nitrogen and 0.8 moles of hydrogen react to form ammonia gas. If the equilibrium constant for the reaction is 3.5 x 10^-4 at a certain temperature, what is the equilibrium concentration of ammonia?

asked Jan 22 in Chemical reactions by SherrylIwz83 (2.0k points)

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Calculate the bond dissociation energy of the H-H bond given the following information: The enthalpy change for the reaction 2H2(g) → 4H(g) is +436 kJ/mol, and the average bond dissociation energy for a H-H bond is 436 kJ/mol.

asked Jan 23 in ThermoChemistry by ZakOleary170 (1.8k points)

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A student mixed 25.0 grams of sodium hydroxide with excess hydrochloric acid. If the theoretical yield of sodium chloride is 34.0 grams, what is the percent yield of the reaction?

asked Jan 22 in Chemical reactions by JonasQuj2910 (2.1k points)

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Calculate the bond dissociation energy of the carbon-hydrogen bond in methane (CH4), given that the reaction CH4(g) → CH3(g) + H(g) has a ΔH° of 435 kJ/mol.

asked Jan 23 in ThermoChemistry by JudithMackni (2.3k points)

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A chemistry student has two containers, one with 25 grams of hydrogen gas and the other with 35 grams of oxygen gas. What mass of water can be produced when these two gases undergo a reaction and which gas is the limiting reactant?

asked Jan 22 in Chemical reactions by TraciCoomes1 (1.9k points)

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1 answer 72 views

Calculate the enthalpy change for the combustion of methane at standard conditions, given the following information:- The enthalpy of formation of CO2(g) is -393.5 kJ/mol.- The enthalpy of formation of H2O(g) is -241.8 kJ/mol.- The enthalpy of formation of CH4(g) is -74.8 kJ/mol.

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

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A chemistry student wants to create a buffer solution with a pH of 7.2 using acetic acid and sodium acetate. The student has calculated that they need 0.1 moles of each component to make a 250 mL buffer solution. However, the student accidentally added 0.02 moles of hydrochloric acid to the buffer solution. Calculate the new pH of the buffer solution and explain if the addition of the hydrochloric acid has shifted the equilibrium position of the reaction towards the acid or the base.

asked Jan 22 in Chemical equilibrium by ElidaHaskins (1.7k points)

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A chemistry student added 2 grams of sodium hydroxide to 50 ml of hydrochloric acid with a concentration of 0.5 M. After the reaction was complete, the student collected 1.5 grams of sodium chloride. Calculate the percent yield of sodium chloride.

asked Jan 22 in Chemical reactions by RosarioUsher (2.0k 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 75 views

Calculate the bond dissociation energy (in kJ/mol) of the C-H bond in methane (CH4) using experimental data.

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

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1 answer 114 views

A chemistry student must calculate the boiling point of a solution composed of 10 g of glucose (C6H12O6) dissolved in 100 g of water at 1 atm pressure. The boiling point elevation constant for water (Kb) is equal to 0.512°C/m, and the normal boiling point of pure water is 100°C.

asked Jan 22 in Physical Chemistry by Bernice06378 (1.4k points)

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1 answer 65 views

Calculate the enthalpy of precipitation when 50.0 mL of 0.200 M BaCl2(aq) is added to 30.0 mL of 0.150 M Na2SO4(aq).

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

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1 answer 74 views

Calculate the bond order and bond length of the nitric oxide molecule (NO).

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

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1 answer 68 views

Calculate the enthalpy change of adsorption for the adsorption of CO gas on activated carbon at 25°C, given that the equilibrium constant for the reaction is 1.5×10^3 L/mol and the molar density of CO is 1.25 g/L. The surface area of activated carbon used is 50 m^2/g, and the initial pressure of CO is 2.5 atm.

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

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1 answer 57 views

Calculate the lattice energy of NaF given the following information: the enthalpy of formation of NaF is -572.6 kJ/mol, the ionization energy of Na is 495.8 kJ/mol, the electron affinity of F is -328 kJ/mol, and the Madelung constant for NaF is 1.747.

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

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1 answer 117 views

A beaker of water is placed on a hot plate, and the temperature is gradually increased. Write an equation for the rate of change of entropy with respect to time during this process, assuming the system is not in equilibrium. Use the equation to determine the rate of entropy production in the water as it is heated from 25°C to 100°C at a constant rate of 2°C/min.

asked Jan 22 in Physical Chemistry by AguedaD83620 (2.6k points)

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1 answer 73 views

Calculate the change in enthalpy (ΔH) for the combustion of methane gas (CH4) at 25°C and constant pressure of 1 atm. The equation for the combustion of methane is:CH4 (g) + 2O2 (g) → CO2 (g) + 2H2O (l) Given the standard enthalpies of formation at 25°C are:ΔHf[CH4 (g)] = -74.87 kJ/mol ΔHf[CO2 (g)] = -393.5 kJ/mol ΔHf[H2O (l)] = -285.8 kJ/mol Assume that water is in its liquid phase at the end of the reaction.

asked Jan 23 in Physical Chemistry by RobertoLafla (2.1k points)

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1 answer 57 views

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 change in enthalpy (ΔH) for the combustion of 10 grams of propane (C3H8) if the heat released by the reaction is -2202 kJ.

asked Jan 23 in Chemical reactions by AdelineBurro (1.9k points)

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