Question

In: Chemistry

The standard heat of formation of CaBr2 is -675 kJ/mol. The first ionization energy of Ca...

The standard heat of formation of CaBr2 is -675 kJ/mol. The first ionization energy of Ca is 590 kJ/mol and its second ionization energy is 1145 kJ/mol. The heat of sublimation of Ca[Ca(s)→Ca(g)] is 178 kJ/mol. The bond energy of Br2 is 193 kJ/mol, the heat of vaporization of Br2(l) is 31 kJ/mol, and the electron affinity of Br is -325 kJ/mol.

Calculate the lattice energy of CaBr2.

Expert Solution

heat of romation

Ca(s) + Br2(l) -----------------> CaBr2(s) H = -675Kj/mole

heat of sublimation

Ca(s) ----------------> Ca(g) H1 = 178Kj/mole

The first ionization energy of Ca

Ca(g) ---------------> Ca^+(g) + e^- H2 = 590Kj/mole

The second ionization energy of Ca

Ca^+(g) ---------------> Ca^2+(g) + e^- H3 = 1145Kj/mole

heat of vaporization of Br2(l)

Br2(l) -----------------> Br2(g) H4 = 31Kj/mole

The bond energy of Br2

Br2(g) -------------> 2Br(g) H5 = 193Kj/mole

the electron affinity of Br

2Br + 2e^- -------------> 2Br^- H6 = 2*-325 = 650KJ/mole

lattice energy

Ca^2+ (g) + 2Br^-(g) ----------------> CaBr2(s) H7 = ?

from Hess law

H = H1 + H2 + H3 + H4 + H5 + H6

-675 = 178+590+ 1145+31+193-650 + H7

H7 = -2162KJ/mole

lattice energy of CaBr2 = -2162KJ/mole

queen_honey_blossom answered 3 years ago

The standard heat of formation of PI3(s) is -24.7 kJ/mol and the PI bond energy in...

The standard heat of formation of PI3(s) is -24.7 kJ/mol and the PI bond energy in this molecule is 184 kJ/mol. The standard heat of formation of P(g) is 334 kJ/mol and that of I2(g) is 62 kJ/mol. The I2 bond energy is 151 kJ/mol. Calculate the heat of sublimation of PI3

The ionization energy of a certain element is 352 kJ/mol. (Ionization energy is the minimum energy...

The ionization energy of a certain element is 352 kJ/mol. (Ionization energy is the minimum energy required to remove an electron from an atom. It is usually expressed in units of kJ/mol; that is, it is the energy in kilojoules required to remove one mole of electrons from one mole of atoms.) However, when the atoms of this element are in the first excited state, the ionization energy is only 166 kJ/mol. Based on this information, calculate the wavelength of...

1. the first ionization energy of Ca is greater than the first ionization energy of K,...

1. the first ionization energy of Ca is greater than the first ionization energy of K, but the second ionization of Canis lower than the second ionization energy of K. Explain. 2. Compare the hybridization of the sulfur atom in the molecules SF_2, SF_4, and SF_6 3. Assign formal charges to each atom in NH_4^+, SO_3^-2, and XeF_2

the ionization energy for a 1s electron in a silver atom is 2.462 x 106 kJ/mol...

the ionization energy for a 1s electron in a silver atom is 2.462 x 106 kJ/mol Determine an approximate value for Zeff for the Ag 1s electron. Assume the Bohr model applies to the 1s electron. Zeff is the apparent nuclear charge experienced by the electrons How does Zeff from part a compare to Z for Ag? Rationalize the relative numbers.

1. For KNO3 the heat of solution is 23.8 kJ/mol and the lattice energy is -685.0...

1. For KNO3 the heat of solution is 23.8 kJ/mol and the lattice energy is -685.0 kJ/mol. Calculate the heat of hydration. 2. 60.3 g of zinc sulfate [ZnSO4], is added to 160. g of water. Will the salt dissolve completely and, if so, will the solution be saturated or unsaturated? The solubility of ZnSO4 is 3.57 m. 3. What volume of water, in mL, is needed to dissolve 2.2 mg of hydrogen gas when the partial pressure of hydrogen...

The standard molar heat of formation of water is -258.8 kJ/mol.a. What is the significance of...

The standard molar heat of formation of water is -258.8 kJ/mol.a. What is the significance of the negative sign associated with this value?b. why is the magnitude of this value so much larger than the heat of vaporization of water (?H° vap = 41 kJ/mol)?c. Calculate the amount of heat produced in making 50.0 mL of water from its elements under standard conditions.

The ionization energy of a cesium (Cs) atom is 596 kj/mol of atoms. What wavelength would...

The ionization energy of a cesium (Cs) atom is 596 kj/mol of atoms. What wavelength would a single photon have to have to ionize a single cesium atom?

The standard enthalpy of fusion of water is 6.01 kJ/ mol, the molar heat capacity at...

The standard enthalpy of fusion of water is 6.01 kJ/ mol, the molar heat capacity at a constant pressure of liquid water can be assumed to be constant at 75.5 J/mol*K, thoughout the liquid phase, and the standard enthalpy of vapoziration is 40.7 kJ/mol at the boiling point. Calculate the total entropy change (in SI units), for heating one mole of water, starting with ice just below the melting point and going to just above the boiling point at standard...

at 25c the standard enthalpy of formation of HF(aq) is -320.1 kj/mol. of OH(aq) it is...

at 25c the standard enthalpy of formation of HF(aq) is -320.1 kj/mol. of OH(aq) it is -229.6Kj/mol. of F (aq) it is -329.2 Kj/mol.of H2O(l) it is -285.9Kj/mol. a. calculate the standard enthalpy of neutralization of HF. HF (aq) + OH- (aq) -->F-(aq) +H2O (l) b.using the value of -56.2kj as the standard enthalpy change for the reaction H+(aq)+ OH(aq)->H2O(l) c. calculate the standard enthalpy of change for the reaction HF->H+F

Sodium hydroxide (NaOH) has a lattice energy of -887 kJ/mol and a heat of hydration of...

Sodium hydroxide (NaOH) has a lattice energy of -887 kJ/mol and a heat of hydration of -932 kJ/mol. How much solution could be heated to boiling by the heat evolved by the dissolution of 24.5 g of NaOH? (For the solution, assume a heat capacity of 4.0 J/g⋅∘C, an initial temperature of 25.0 ∘C, a boiling point of 100.0 ∘C, and a density of 1.05 g/mL.) Express your answer using two significant figures.