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Calculate the electronegativity difference between a hydrogen atom (H) and a chlorine atom (Cl) in the molecule HCl.

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

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1 answer 114 views

A student adds 0.1 M HCl to a solution containing 0.05 M NaOH. Calculate the effect on the equilibrium position of the system after adding a buffer solution consisting of 0.1 M CH3COOH and 0.1 M CH3COONa. Assume the dissociation constant (Ka) of CH3COOH is 1.8x10^-5.

asked Jan 22 in Chemical equilibrium by GroverRamey (2.2k points)

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1 answer 82 views

Calculate the bond energy required to break the carbon-carbon single bond in methane (CH4).

asked Jan 23 in Chemical reactions by BrodieUus47 (1.7k points)

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1 answer 76 views

Calculate the enthalpy change for the reaction: 2H2 (g) + O2 (g) → 2H2O (l) given that the standard enthalpy of formation for water is -285.8 kJ/mol, and standard enthalpies of formation of H2 (g) and O2 (g) are 0 kJ/mol.

asked Jan 23 in Chemical thermodynamics by KaraMcRae960 (2.5k points)

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1 answer 84 views

Calculate the amount of heat released when 50 grams of NaOH is dissolved in 500 mL of water at 25°C. The heat of crystallization of NaOH is -44.51 kJ/mol. Assume the final temperature of the solution is 25°C and the heat capacity of the solution is 4.18 J/g °C.

asked Jan 23 in ThermoChemistry by RenaBrower51 (1.7k points)

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1 answer 121 views

A chemistry student needs to determine the composition of a sample that contains an unknown mixture of sodium chloride (NaCl) and potassium chloride (KCl). The student weighs 2.00 g of the mixture and dissolves it in water to obtain a solution. The student then precipitates the chloride ions from the solution with excess silver nitrate (AgNO3) to obtain 6.50 g of silver chloride (AgCl). Using mass balance calculations, determine the mass and percentage composition of the sodium chloride and potassium chloride in the mixture.

asked Jan 22 in Analytical Chemistry by KreogMoore5 (6.4k points)

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1 answer 67 views

Calculate the formal charge on each atom in the nitrate ion (NO3^-).

asked Jan 23 in Inorganic Chemistry by WilheminaMea (1.5k points)

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1 answer 75 views

Calculate the enthalpy change when 50 mL of 0.2 M sodium chloride solution is mixed with 50 mL of 0.2 M silver nitrate solution. The final temperature of the solution was found to be 25°C and the initial temperature of the reactants was 30°C. The specific heat of the solution is 4.18 J/g°C, and the density of the solution is 1.00 g/mL.

asked Jan 23 in ThermoChemistry by JaimeFuqua07 (2.0k points)

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1 answer 76 views

Calculate the enthalpy change for the precipitation reaction that occurs when 50.0 mL of 0.100 M AgNO3 (aq) and 25.0 mL of 0.100 M NaCl (aq) are mixed together. The final temperature of the solution is 25.0°C, and the initial temperature of both solutions was 25.0°C. The heat capacity of the solution is 4.18 J/(g °C) and the density of each solution is 1.00 g/mL. Assume that the reaction goes to completion and that the density and specific heat capacity of the resulting solution are the same as those of pure water.

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

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1 answer 65 views

Calculate the lattice energy of CaCl2 given that the distance between the Ca2+ and Cl- ions in the crystal lattice is 0.231 nm and the Born-Lande equation constant is 2.21 x 10^-19 J nm.

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

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1 answer 84 views

Calculate the amount of heat absorbed (in joules) when 10 grams of sodium hydroxide (NaOH) is dissolved in 100 mL of water at 25°C, given that the enthalpy of solution for NaOH is -44.51 kilojoules per mole.

asked Jan 23 in ThermoChemistry by MervinSchroe (2.0k points)

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1 answer 65 views

Calculate the heat required to sublime 34.5 g of dry ice (solid CO2) at a constant temperature and pressure, given that the heat of sublimation of CO2 is 25.2 kJ/mol.

asked Jan 23 in ThermoChemistry by Aline0805519 (1.8k points)

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1 answer 67 views

Calculate the Faraday constant for a half-cell reaction in which the electrode potential is 0.32 V and one mole of electrons are exchanged during the reaction. Express your answer in units of coulombs per mole.

asked Jan 23 in ElectroChemistry by Phillipp57B1 (2.3k points)

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1 answer 156 views

Identify the type of isomerism present in the compounds Butane and its isomer Isobutane and explain the structural differences between these two isomers.

asked Jan 21 in Organic Chemistry by KellyStreeto (1.6k points)

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1 answer 66 views

Calculate the heat of crystallization in kJ/mol of a substance, given that 100 g of it dissolved in water and cooled from 60°C to 20°C, releasing 5490 J of heat. The molar mass of the substance is 120 g/mol.

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

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1 answer 81 views

Calculate the bond order and bond length of the nitrogen-oxygen bond in the NO molecule using the molecular orbital theory. Show your calculation and discuss the nature of the bond formed in NO molecule.

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

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1 answer 84 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 155 views

What is the molecular formula and structure of a compound that contains one benzene ring and two methyl groups?

asked Jan 21 in Organic Chemistry by CandyDemaio (2.3k points)

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1 answer 76 views

Calculate the enthalpy change for the ionization of magnesium, given that it requires 738 kJ/mol to remove an electron from a gaseous magnesium atom, and that the ionization energy for a second electron is 1450 kJ/mol.

asked Jan 23 in ThermoChemistry by XLNDorris808 (1.7k points)

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1 answer 67 views

Calculate the equilibrium constant for the reaction: 2 NOCl(g) ⇌ 2 NO(g) + Cl2(g) if at equilibrium the concentrations are [NOCl] = 0.050 M, [NO] = 0.030 M, and [Cl2] = 0.020 M.

asked Jan 23 in Chemical equilibrium by SNBBernd7967 (2.3k points)

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