From the following data, the heat of formation of PCl5 2 P(s)+3 Cl2( g) →2 PCl3( g) ; ΔH=151.8 k

step 1 From the following data, the heat of formation of PCL5, that is Phosphorus pentacloride, will be

From the following data, the heat of formation of PCl5 2...

From the following data, the heat of formation of $\mathrm{PCl}_{5}$ $2 \mathrm{P}(\mathrm{s})+3 \mathrm{Cl}_{2}(\mathrm{~g}) \rightarrow 2 \mathrm{PCl}_{3}(\mathrm{~g}) ; \Delta H=151.8 \mathrm{kcal}$ $\mathrm{PCl}_{3}+\mathrm{Cl}_{2}(\mathrm{~g}) \rightarrow \mathrm{PCl}_{5}(\mathrm{~g}) ; \Delta H=32.8 \mathrm{kcal}$ (1) $217.4 \mathrm{kcal}$ (2) $+217.4 \mathrm{kcal}$ (3) $108.7 \mathrm{kcal}$ (4) $+108.7 \mathrm{kcal}$

From the following data, the heat of formation of $\mathrm{PCl}_{5}$ $2 \mathrm{P}(\mathrm{s})+3 \mathrm{Cl}_{2}(\mathrm{~g}) \rightarrow 2 \mathrm{PCl}_{3}(\mathrm{~g}) ; \Delta H=151.8 \mathrm{kcal}$
$\mathrm{PCl}_{3}+\mathrm{Cl}_{2}(\mathrm{~g}) \rightarrow \mathrm{PCl}_{5}(\mathrm{~g}) ; \Delta H=32.8 \mathrm{kcal}$
(1) $217.4 \mathrm{kcal}$
(2) $+217.4 \mathrm{kcal}$
(3) $108.7 \mathrm{kcal}$
(4) $+108.7 \mathrm{kcal}$

Labs

Want to see this concept in action?

NEW

Explore this concept interactively to see how it behaves as you change inputs.

View Labs

Key Concepts

Heat of Formation

Heat of formation refers to the change in enthalpy when one mole of a compound is formed from its elements in their standard states. It is a key parameter in thermochemistry that helps in understanding the energy changes during compound formation.

Hess's Law

Hess's Law is the principle that the total enthalpy change for a reaction is the same, regardless of the number of steps or the pathway taken. This allows one to compute the heat of formation from multiple related reactions by algebraically adding their enthalpy changes.

Thermochemical Equations

Thermochemical equations are balanced chemical equations that include the enthalpy change of the reaction. They provide a basis for applying Hess's Law and calculating heat of formation by allowing the combination or reversal of reactions.

Reaction Stoichiometry

Reaction stoichiometry involves the quantitative relationships among substances in a chemical reaction. It is critical for accurately scaling the enthalpy changes from thermochemical equations to correspond with the formation of a specific amount of product.

Transcript

Please give Ace some feedback