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What is the change in enthalpy (?H) for a chemical
Chapter 6, Problem 20E(choose chapter or problem)
Problem 20E
What is the change in enthalpy (ΔH) for a chemical reaction? How is ΔH different from ΔE?
Questions & Answers
QUESTION:
Problem 20E
What is the change in enthalpy (ΔH) for a chemical reaction? How is ΔH different from ΔE?
ANSWER:
Solution: The distance between two adjacent crests or troughs is called wavelength. It is denoted by the greek letter lambda() and is generally expressed in terms of Angstrom units(A ) [1 A = 10 -10m] On the other hand, the number of waves which pass through a given point in one second is known as the frequency. It is denoted by the greek letter nu() and is generally expressed in -1 terms of Hertz(Hz) [1 Hz = 1 sec ] If c is the velocity of light, the the relation between wavelength, frequency and velocity of light is given by: c = x ------(1) Step1: a) Given, wavelength of the