Which has lowest lattice energy?

cesium iodide

How do you know which compound has higher lattice energy?

To decide whether BaS or CaO has the greater lattice energy, we need to consider the relative sizes of the ions because both compounds contain a +2 metal ion and a −2 chalcogenide ion. Because Ba 2 + lies below Ca 2 + in the periodic table, Ba 2 + is larger than Ca 2 +. Similarly, S 2− is larger than O 2−.

What is lattice energy and how do you calculate it?

Lattice energy is defined as the energy required to separate a mole of an ionic solid into gaseous ions. Lattice energy cannot be measured empirically, but it can be calculated using electrostatics or estimated using the Born-Haber cycle.

How do you calculate lattice?

Calculate the lattice constant, a, of the cubic unit cell. If the space lattice is SC, the lattice constant is given by the formula a = [2 x r]. For example, the lattice constant of the SC-crystallized polonium is [2 x 0.167 nm], or 0.334 nm.

How can we calculate lattice energy?

Lattice Energy Formula

Lattice Energy Formula per mole is symbolized as.
Example 1: Compute the Lattice energy of NaCl by using Born-Lande equation.
Answer:
UL= – 755 KJmol-1
Example 2: The lattice energy of AgBr is 895 KJ mol-1. Predict the Lattice energy of the isomorphous AgI using Born-Lande equation.

Can lattice energy be positive?

In one definition, the lattice energy is the energy required to break apart an ionic solid and convert its component atoms into gaseous ions. This definition causes the value for the lattice energy to always be positive, since this will always be an endothermic reaction.

Which ion’s hydration energy is the most exothermic?

lithium ion

Is hydration always exothermic?

The hydration step in the second reaction is always exothermic (Hhydration < 0) as H2O molecules are attracted into the electrostatic field of the ion. The heat (enthalpy) of solution (Hsolution) is the sum of the lattice and hydration energies ( Hsolution = Hhydration + Hlattice energy).