If a chemical reaction at STP is carried out in four steps and similar reactic is carried out in one step by another method, the total enthalpy change in the former case will be four times greater than that of the second method be four times lesser than that of the second method depend upon external physical conditions be the same as in the second method O be two times greater than that of the second method

If a chemical reaction at STP is carried out in four steps and similar reactic is carried out in one step by another method, the total enthalpy change in the former case will be four times greater than that of the second method be four times lesser than that of the second method depend upon external physical conditions be the same as in the second method O be two times greater than that of the second method

Chemistry for Engineering Students

4th Edition

ISBN:9781337398909

Author:Lawrence S. Brown, Tom Holme

Publisher:Lawrence S. Brown, Tom Holme

Chapter9: Energy And Chemistry

Section: Chapter Questions

Problem 9.101PAE

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Concept explainers

Thermochemistry

Thermochemistry can be considered as a branch of thermodynamics that deals with the connections between warmth, work, and various types of energy, formed because of different synthetic and actual cycles. Thermochemistry describes the energy changes that occur as a result of reactions or chemical changes in a substance.

Exergonic Reaction

The term exergonic is derived from the Greek word in which ‘ergon’ means work and exergonic means ‘work outside’. Exergonic reactions releases work energy. Exergonic reactions are different from exothermic reactions, the one that releases only heat energy during the course of the reaction. So, exothermic reaction is one type of exergonic reaction. Exergonic reaction releases work energy in different forms like heat, light or sound. For example, a glow stick releases light making that an exergonic reaction and not an exothermic reaction since no heat is released. Even endothermic reactions at very high temperature are exergonic.

Question

If a chemical reaction at STP is carried out in four steps and similar reaction
is carried out in one step by another method, the total enthalpy change in
the former case will
be four times greater than that of the second method
be four times lesser than that of the second method
depend upon external physical conditions
O be the same as in the second method
be two times greater than that of the second method

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