Download the App!

Get 24/7 study help with the Numerade app for iOS and Android! Enter your email for an invite.

Get the answer to your homework problem.

Try Numerade free for 7 days

Like

Report

The standard heat of formation of PI3(s) is -24.7 kJ/mol, and the PI bond energy in this molecule is 184 kJ/mol. The standard heat of formation of PI is 334 kJ/mol, and that of I2(g) is 62 kJ/mol. The I2 bond energy is 151 kJ/mol. Calculate the heat of sublimation of PI3[PI3(s) PI3(g)].

$203.7 k \mathrm{~J} / \mathrm{mo}$

Chemistry 102

Chemistry 101

Chapter 9

Thermochemistry

Thermodynamics

Chemical reactions and Stoichiometry

Alejandro E.

November 12, 2020

But why does the answer say its 126.2

Rice University

University of Toronto

Lectures

00:42

In thermodynamics, the zer…

01:47

A spontaneous process is o…

15:17

Given the following inform…

05:04

The standard heat of forma…

01:55

Calculate the standard ent…

01:04

Use the following standard…

03:03

01:41

The standard enthalpy of f…

11:21

01:57

02:33

11:50

Calculate a lattice energy…

0:00

15:04

Look up the lattice energi…

00:58

The lattice energy $^{*}$ …

05:05

The $\Delta H_{\mathrm{f}}…

03:39

02:08

Using the following data, …

02:30

From the following data, c…

00:35

04:55

So this question wants us to find the Delta H sublimation of P ay three. So that's P ay three solid to p ay three gas. And so we know that this Delta H of sublimation is equal to the Delta H of formation of P ay three gas minus the delta H of formation of P ay three solid and so were given this second value, it's negative. Twenty four point seven Killer. Jules Permal We just need to find this first value, and then we can complete this equation. And so to find this first value, the first thing we're going to do is write out our equation of interest. So that would be P I gas plus I to gas form's P ay three gas. And so the first thing we can do is determine the Delta h of this reaction using average bond energies. So that would be the sum of the ages of Bond's broken minus the sum of the ages off bonds formed. And that is going to be equal to the P I Bond plus Thie II bond minus three times the P I bond. And so doing this we have one eighty four plus one fifty one minus three times one eighty four. And that gives us negative to seventeen Killa, Jules, Permal and all of these values air given in the problem for the bond energy of the P I bond, the bond energy of the eye I bond and the bond energy of the P A bond again. So this is our delta h of this reaction. And we also know that the Delta H off this reaction is going to be equal to the entropy of formation of the P I three gas minus the entropy of formation of P I gas minus the entropy of formation off to gas just based on a simple products minus reactant ce. And so we now know all of these values except for the entropy of formation of the P ay three gas, which is what we're interested in. So we take our negative to seventeen killer Jules Permal that equals the entropy of formation of the P ay three gas. And then we subtract and papi information off P I, which is three thirty four killer Jules per mall and then subtract the entropy information of the I too, which is sixty two killer jewels for more. And that gives us an entropy of formation for P I three gas of one seventy nine killer Jules Permal. So now that we have that value, we can go back to our original equation, which was dealt H sublimation equals the entropy of formation of P ay three gas minus the MPA p of formation of P ay three solid. And that gives us now we have both of these values. We just found our entropy information of P I gas to be one seventy nine killer Jules Permal and we know our entropy. A formation off ps three solid is negative. Twenty four point seven Killer Jules per mall. And so that gives us on an therapy of sublimation to be two or three point seven killer Jules Permal. And that is our final answer.

View More Answers From This Book

Find Another Textbook

Numerade Educator

In thermodynamics, the zeroth law of thermodynamics states that if two syste…

A spontaneous process is one in which the total entropy of the universe incr…

Given the following information, construct a Born-Haber cycle to calculate t…

The standard heat of formation of CaBr_ $_{2}$ is $-675 \mathrm{kJ} / \mathr…

Calculate the standard enthalpy of formation $\left(\Delta H_{\mathrm{f}}^{\…

Use the following standard enthalpies of formation to estimate the $\mathrm{…

The standard enthalpy of formation of gaseous molecular iodine is $62.4 \mat…

Calculate a lattice energy for $\mathrm{CaH}_{2}(s)$ in kilojoules per mole …

The standard heat of formation of CaBr2 is -675 kJ>mol. The first ionizat…

Look up the lattice energies in Table 6.3, and calculate the energy change i…

The lattice energy $^{*}$ of Nal is $-686 \mathrm{kJ} / \mathrm{mol}$, and t…

The $\Delta H_{\mathrm{f}}^{\circ}$ of $\mathrm{TiI}_{3}(s)$ is $-328 \mathr…

The standard enthalpy of formation of gaseous $\mathrm{H}_{2} \mathrm{O}$ at…

Using the following data, calculate the standard heat of formation of ICl $(…

From the following data, calculate the average bond enthalpy for the $\mathr…

The standard heat of formation of $\mathrm{OF}_{2}$ gas is $+24.5 \mathrm{kJ…

The standard enthalpy of formation of $\mathrm{H}_{2} \mathrm{O}(l)$ at 298 …

02:51

Calculate the mass of nitrogen dissolved at room temperature inan 80.0-L…

02:06

In the Lewis model, the two bonds in a double bond look identical. However, …

01:00

Which statement is true of the internal energy of the system and its surroun…

02:15

A metal, M, of atomic mass 96 amu reacts with fluorine to form asalt tha…

04:37

Write a hybridization and bonding scheme for each molecule or ion. Sketch th…

00:08

Magnesium citrate, Mg3(C6H5O7)2, belongs to a class of laxativescalled h…

03:46

A pure gold ring and pure silver ring have a total mass of 14.9 g. We heat t…

03:19

Is each compound more soluble in acidic solution or in purewater? Explai…

02:46

A 50.0-mL solution is initially 1.55% MgCl2 by mass and has adensity of …

08:34

What relative masses of dimethyl amine and dimethyl ammonium chloride do you…