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Introductory Chemistry: A Foundati...

9th Edition
Steven S. Zumdahl + 1 other
ISBN: 9781337399425

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BuyFindarrow_forward

Introductory Chemistry: A Foundati...

9th Edition
Steven S. Zumdahl + 1 other
ISBN: 9781337399425
Textbook Problem
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ess’s law is often confusing to students. Imagine you are talking to a friend who has not taken any science courses. Using the reactions

msp;  P 4 ( s )   +  6Cl 2 ( g )   4PCl 3 ( g )                                                       H =   2 . 44  ×  1 0 3 Kj 4PCl 5 ( g )   P 4 ( s ) + 1 0 Cl 2 ( g )                                                           H =  3 . 43  ×  1 0 3 Kj

plain to your friend how Hess’s law can be used to calculate the enthalpy change for the reaction

msp;  PCl 5 ( g )   PCl 3 ( s ) + Cl 2 ( g )

Interpretation Introduction

Interpretation:

The enthalpy change for the reaction is to be calculated by using Hess’ law.

Concept Introduction:

Hess’s Law or the law of constant heat of summation states that “the total enthalpy of the multistep reaction is the sum of the enthalpy of each step involved in it.”

Enthalpy gives the information regarding changes in heat or energy during the formation of reactant into products.

Explanation

The change in enthalpy is calculated by balancing the chemical equation. In a chemical equation when the number of atoms of an element on the left-hand side is equal to the number of atoms of that element on the right-hand side, it is known as a balanced chemical equation. The balancing of a chemical equation is done to follow the law of conservation of mass.

The given equations are,

P4(s)+6Cl2(g)4PCl3(g)ΔH=2.44×103kJor2440kJ4PCl5(g)P4(s)+10Cl2(g)ΔH=3.43×103kJor3430kJ

Both equations along with enthalpy changes are multiplied by 14 to balance them.

The balancing of given chemical equations and calculation of the change in enthalpy is shown below

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