How do you calculate the lattice enthalpy of KCl?
How do you calculate the lattice enthalpy of KCl?
Given that:Sublimation energy of K(s) = 89 kJ mol–1Ionization energy of K(g) = 418 kJ mol–1Dissociation energy of Cl2(g) = 244 kJ mol–1Electro attachment energy of Cl(g) = –349 kJ mol–1Formation of KCl(s) = – 437a)-575 kJ mol–1b)-202 kJ mol–1c)-717 kJ mol–1d)-800 kJ mol–1Correct answer is option ‘C’.
What is the enthalpy of formation of KCl?
-436.7 kJ/mol.
The enthalpy of formation of KCl(s) is -436.7 kJ/mol.
Which has higher lattice energy LiCl or KCl?
Explain your choices. KCl will have the more negative lattice energy because potassium is smaller than cesium and they both have a 1 + charge.
How do you calculate lattice enthalpy?
For NaCl, the lattice dissociation enthalpy is +787 kJ mol-1. You should talk about “lattice formation enthalpy” if you want to talk about the amount of energy released when a lattice is formed from its scattered gaseous ions. For NaCl, the lattice formation enthalpy is -787 kJ mol-1….
| kJ | |
|---|---|
| calculated ΔHf | +3949 |
What is the lattice energy of KCl in kJ mol?
-715 kJ/mol
Lattice energy of KCl is -715 kJ/mol.
What is the lattice energy of MgCl2?
The values of the lattice energy for MgCl2, CaCl2, and SrCl2 are 2522 kJ/mol, 2253 kJ/mol, and 2127 kJ/mol, respectively.
What is formula of potassium chloride?
KCl
Potassium chloride/Formula
What is the molar mass of KCl?
74.5513 g/mol
Potassium chloride/Molar mass
Answer and Explanation: The molar mass of a compound is calculated by multiplying the sum of the relative atomic mass Ar of the constituent atoms by the molar mass constant Mu . Where, Mr is the relative molar mass. Hence the molar mass of KCl is obtained as 74.5513 g mol−1 74.5513 g m o l − 1 .
Why does KCl have greater lattice energy?
(i) Br- is bigger than Cl- so KCl has a higher lattice energy and a higher melting point than KBr. (ii) K+ is larger than Na+ so NaCl has a higher lattice energy and a higher melting point than KCl. The Ag+ ion is intermediate in size between Na+ and K+.
Why KCl is more stable than NaCl?
Why is KCl more stable than NaCl? – Quora Why is KCl more stable than NaCl? The difference in stability comes from potassium’s ability to hold a positive charge (lose an electron) better than sodium.
What is lattice enthalpy calculate the lattice enthalpy of formation of NaCl?
For NaCl, the lattice formation enthalpy is -787 kJ mol-1.
How do you calculate the lattice enthalpy of sodium chloride?
NaCl(g) → Na+ (g) + Cl- (g) only. Lattice enthalpy value from ∆ H0(5) is written with a reversed sign. ∴ Lattice enthalpy of NaCl = +788.0 kJ mol-1.
Why is the lattice energy of calcium chloride greater than potassium chloride?
For example, the lattice energy of calcium chloride is greater than that of potassium chloride despite the similarity in the crystal arrangements of these compounds. This is because the magnitude of the positive charge held by the calcium cation (+2) is greater than that held by the potassium cation (+1).
Is the lattice energy of sodium chloride always negative?
Some sources define lattice energy in the opposite manner, i.e. the amount of energy released when an ionic solid is formed from its gaseous ionic constituents via an exothermic process. According to this definition, lattice energy must always hold a negative value. The crystal lattice of a sodium chloride molecule is illustrated below.
What is the function of potassium and chloride?
More… Potassium Chloride is a metal halide composed of potassium and chloride. Potassium maintains intracellular tonicity, is required for nerve conduction, cardiac, skeletal and smooth muscle contraction, production of energy, the synthesis of nucleic acids, maintenance of blood pressure and normal renal function.
How is the lattice energy of an ionic crystal expressed?
The molar lattice energy of an ionic crystal can be expressed in terms of molar lattice enthalpy, pressure, and change in volume via the following equation: Δ GU = Δ GH – pΔV m. Where: Δ GU denotes the molar lattice energy.