Hot questions

0 votes

1 answer 55 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)

0 votes

1 answer 51 views

Calculate the corrosion potential of a copper electrode that is coupled with a silver electrode in a 0.010 M silver nitrate solution at 25°C. Given that the standard reduction potential for Ag+ + e- → Ag is +0.80V and for Cu2+ + 2e- → Cu is +0.34V. What is the potential of the copper electrode with respect to the standard hydrogen electrode?

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

0 votes

1 answer 55 views

Calculate the activation energy required for a chemical reaction to occur, given that the rate constant at 298 K is 4.70 x 10^-3 s^-1 and the rate constant at 313 K is 1.20 x 10^-2 s^-1. (Assume the Arrhenius equation applies.)

asked Jan 23 in Chemical reactions by JanisButterf (2.1k points)

0 votes

1 answer 88 views

A chemistry student needs to prepare a buffer solution with a pH of 7.2 using acetic acid (CH3COOH) and sodium acetate (CH3COONa). The student has 100 mL of 0.1 M acetic acid and 100 mL of 0.1 M sodium acetate. What volume of each solution do they need to mix to prepare the desired buffer solution with a total volume of 500 mL?

asked Jan 22 in Chemical reactions by BradCrandall (2.5k points)

0 votes

1 answer 50 views

Calculate the enthalpy change (in kJ/mol) for the isomerization reaction of butene-1 to butene-2. Given the standard enthalpy of formation values for butene-1 as -126.3 kJ/mol and butene-2 as -126.0 kJ/mol, and the heat of combustion values for butene-1 as -2670.0 kJ/mol and butene-2 as -2666.0 kJ/mol.

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

0 votes

1 answer 88 views

A chemistry student needs to identify an unknown compound found at a crime scene using mass spectrometry. The compound has a molecular weight of 286 g/mol and the mass spectrum shows a strong peak at m/z = 180 and a weaker peak at m/z = 148. What is the possible molecular formula of the unknown compound?

asked Jan 22 in Analytical Chemistry by August936905 (1.5k points)

0 votes

1 answer 45 views

Calculate the enthalpy of adsorption of hydrogen gas on activated carbon if 2 grams of activated carbon absorb 0.025 moles of hydrogen gas at 298 K and the pressure of the system is 1 atm. The molar enthalpy of hydrogen gas is -285.8 kJ/mol at constant pressure.

asked Jan 23 in ThermoChemistry by MaxwellDuff3 (1.9k points)

0 votes

1 answer 47 views

Calculate the enthalpy change for the hydrolysis of 2 moles of sucrose (C12H22O11) if it releases 5184 kJ/mol of energy.

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

0 votes

1 answer 47 views

Calculate the enthalpy change for the hydrolysis of 0.1 moles of sucrose in water given the following information: - The enthalpy change of the reaction is -564 kJ/mol.- The molar mass of sucrose is 342.3 g/mol.- The reaction is exothermic.

asked Jan 23 in ThermoChemistry by MatthewStore (1.3k points)

0 votes

1 answer 52 views

Calculate the bond length between a fluorine atom (F) and a carbon atom (C) in a molecule of CF4, given that the bond energy is 544 kJ/mol and the force constant is 455 N/m.

asked Jan 23 in Chemical bonding by EdgardoHinch (2.2k points)

0 votes

1 answer 52 views

Calculate the bond length between a carbon and a hydrogen atom in methane (CH4), given that the bond energy is 104.2 kcal/mol and the force constant is 500 N/m.

asked Jan 23 in Chemical bonding by Linnea35385 (2.0k points)

0 votes

1 answer 91 views

A chemistry student needs to determine the concentration of a sulfuric acid solution by titrating 25.0 mL of the acid with 0.1000 M sodium hydroxide. The reaction between the two substances is H2SO4 + 2NaOH → Na2SO4 + 2H2O. If it takes 35.0 mL of the sodium hydroxide solution to fully neutralize the sulfuric acid, what is the concentration of the sulfuric acid solution in moles per liter (M)?

asked Jan 22 in Chemical reactions by MarlaColes2 (2.1k points)

0 votes

1 answer 50 views

Calculate the density of solid sodium chloride given that its mass is 5.50 g and its volume is 2.50 cm³.

asked Jan 23 in Inorganic Chemistry by Dawn49061396 (2.1k points)

0 votes

1 answer 50 views

Calculate the corrosion rate of a steel rod when it is placed in a galvanic coupling with a copper strip at 25°C. The initial weight of the steel rod was 28.6 g and it lost 0.48 g in weight after 24 hours of exposure. The area of the steel rod in contact with the electrolyte solution is 3.14 cm² and the electrode potential of the copper strip is +0.34V while the electrode potential of the steel rod is -0.44V. Using Faraday’s law of electrolysis, determine the corrosion rate of the steel rod in mmpy (mils per year).

asked Jan 23 in ElectroChemistry by DeanneMack98 (2.1k points)

0 votes

1 answer 54 views

Calculate the amount of heat absorbed when 32 grams of ice at -10°C melts into water and then further heated to 35°C. (Given: Enthalpy of fusion of ice = 6.01 kJ/mol and specific heat of water = 4.18 J/g°C)

asked Jan 23 in ThermoChemistry by Beatris65S46 (1.9k points)

0 votes

1 answer 54 views

Calculate the amount of heat absorbed when 20 grams of ice at -10°C is melted and then warmed to 30°C. The specific heat of ice is 2.09 J/g°C, the specific heat of water is 4.18 J/g°C and the enthalpy of fusion of ice is 6.01 kJ/mol.

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

0 votes

1 answer 45 views

Calculate the enthalpy change of polymerization for the formation of polystyrene from its monomer, styrene, given the following data:- ΔH°f (Styrene) = -25.68 kJ/mol- Bond enthalpies: C-C = 347 kJ/mol; C=C = 611 kJ/mol; C-H = 413 kJ/mol

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

0 votes

1 answer 52 views

Calculate the bond dissociation energy (in kJ/mol) for the O-H bond in water (H2O) given that the enthalpy change for the reaction H2O (g) → H (g) + OH(g) is +495 kJ/mol and the enthalpy change for the reaction H2(g) + 1/2O2(g) → H2O(g) is -241.8 kJ/mol.

asked Jan 23 in ThermoChemistry by UweEales0685 (1.8k points)

0 votes

1 answer 42 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)

0 votes

1 answer 91 views

A chemistry student is required to calculate the activation energy of a chemical reaction. Given the rate constant of a reaction at two different temperatures, what is the activation energy?

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

Categories