The reason behind the lattice energy of sodium fluoride is more negative than the other sodium halides has to be explained. Concept introduction: Lattice formation enthalpy is the enthalpy change when one mole of solid crystal is formed from its scattered gaseous ions.

Question

An expression for the root mean square velocity, vrms, of a gas was derived. Using Maxwell’s velocity distribution, one can also calculate the mean velocity and the most probable velocity (mp) of a collection of molecules. The equations used for these two quantities are vmean=(8RT/πM)1/2 and vmp=(2RT/M)1/2 These values have a fixed relationship to each other.(a) Arrange these three quantities in order of increasing magnitude.(b) Show that the relative magnitudes are independent of the molar mass of the gas.(c) Use the smallest velocity as a reference for establishing the order of magnitude and determine the relationship between the larger and smaller values.

Answer 1

Question

Chapter 12, Problem 12PS

Interpretation Introduction

Interpretation:

The reason behind the lattice energy of sodium fluoride is more negative than the other sodium halides has to be explained.

Concept introduction:

Lattice formation enthalpy is the enthalpy change when one mole of solid crystal is formed from its scattered gaseous ions.

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