1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
Wewaii [24]
3 years ago
9

Consider the following: Li(s) + ½ I₂(g) --> LiI(s) ΔH = –292 kJ. LiI(s) has a lattice energy of –753 kJ/mol. The ionization e

nergy of Li(g) is 520 kJ/mol, the bond energy of I₂(g) is 151 kJ/mol, and the electron affinity of I(g) is –295 kJ/mol. Use these data to determine the heat of sublimation of Li(s).
Chemistry
1 answer:
Karolina [17]3 years ago
3 0

Answer:

Heat of sublimation of Li(s) = 160.5 kJ/mol

Explanation:

Given that:

\mathtt{2Li(s) + \dfrac{1}{2} I_2(g) \to 2LiI(s)}

ΔH = –292 kJ

The heat of formation for the above reaction =  –292 kJ × 2 =  -584 kJ/mol

\mathtt{Li^+_{(g)} + I^-_{(g)} \to LiI_{(s)}}

The lattice energy of LiI(s) = -753 kJ/mol

\mathtt{Li(g)\to Li^+(g) + e^- }

The ionization energy of LiI(s) = +520 kJ/mol

\mathtt{I_2_{(g)} \to 2I_{(g)} }

The Bond Energy of I₂(g) = 151 kJ/mol

\mathtt{I_{(g)} + e^- \to I^-_{(g)}}

The electron affinity of I(g) = -295 kJ/mol

Heat of sublimation: Sublimation is the process of changing of a solid matter into gas without passing through the liquid stage, Now, the molar heat of sublimation is the amount of energy that must be added to a mole of solid  to turn it directly into a gas without any interference through the liquid phase provided the pressure is  constant.

From  the above reactions: The heat of sublimation  of Li(s) can be calculated by the sum total of the following.

\mathtt{Li_{(s)} + \dfrac{1}{2} I_2_{(g)} \to LiI_{(s)} \ \  -292 kJ/mol} \\ \\\mathtt{I_{(g)} \to \dfrac{1}{2} I2(g)  \ \ -75.5 kJ/mol} \\ \\ \mathtt{I^-(g) \to I(g) + e^-  \ \  +295 kJ/mol} \\  \\ \mathtt{LiI(s) \to Li^+_{(g)} + I^-_{(g)}  \ \ +753 kJ/mol} \\ \\ \mathtt{Li^+_{(g)} + e^- \to Li(s) \ \  -520 kJ/mol} \\ \\

\mathtt{Li(s) \to Li(g)} = (-292 +(-75.5)+295+753+(-520)) kJ/mol

\mathtt{Li(s) \to Li(g)} =  160.5 kJ/mol

Heat of sublimation of Li(s) = 160.5 kJ/mol

You might be interested in
Which of the following observations NOT likely describes a chemical change? a A white solid was exposed to ultraviolet light and
kiruha [24]

Answer:

The correct answer would be - c.  A solid was added to water and the mixture was stirred until the solid was no longer visible

Explanation:

Photostabalizing is the process where a solid change its color in the presence of ultraviolet light, it is a chemical change, so the first option would not be the correct answer.

when two liquid or aqueous solutions are mixed together and form a solid substance, this reaction is known as precipitation and it is a chemical reaction too.

When a solid is placed in a liquid and after stirring it makes the solid vanish is a physical change known as dissolving character.

Thus, the correct answer is option C.

7 0
3 years ago
You determine that Lauren's EER is 2200 kcal/day. You recommend and intake of 60% CHO, 15% protein, and 25% fat. Approximately h
const2013 [10]

Answer:

The answer to your question is 330 g of CHO

Explanation:

Data

Calories needed = 2200 kcal/day

CHO = 60%

Proteins = 15%

Fats = 25%

Grams of carbohydrates needed = ?

Process

1.- Calculate the number of calories  in 60% of 2200 kcal

                      2200 kcal ----------------  100%

                          x            ---------------      60%

                       x = (60 x 2200) / 100

                       x = 1320 kcal

2.- Calculate the grams of CHO

                       1 g of CHO ---------------- 4 kcal

                       x                 ----------------  1320 kcal

                       x = (1320 x 1) / 4

                       x = 1320/4

                       x = 330 g of CHO

6 0
3 years ago
Really need help with the rest of them, please it's due in 20 minutes
ArbitrLikvidat [17]

Answer:

chlorine is for pool

Explanation:

hope is help

8 0
3 years ago
Baby Caitlen is about to turn one year old. She loves to play peek-a-boo and acts so surprised each time a hidden face appears b
Mama L [17]
C. <span>Caitlen doesn't realize her dad still exists each time he hides.</span>
6 0
3 years ago
Read 2 more answers
0 3
Alik [6]
To find heat, you need the following formula

heat= specific heat x mass x ΔT

specific heat (for water)= 4.184--> according to the table
mass= 100 grams
ΔT= 75 -10= 65 °C

let's plug the values.

specific heat= 4.184 x 100 x 65= 27200 joules or 27.2 Kilojoules
6 0
3 years ago
Other questions:
  • Particles of light are known as​
    11·2 answers
  • What are 4 similarities of Metals, Nonmetals, and Metalloids?
    12·1 answer
  • The ability or inability of a substance to combine with or change into one or more new substances is a ______.
    10·2 answers
  • What substance is oxidized in the reaction Mg + Cu2+ — Mg2+ + Cu?
    13·1 answer
  • Consider the following reaction: CO(g)+2H2(g) &lt;--&gt; CH3OH(g).
    10·1 answer
  • Question 1 (True/False Worth 2 points)
    14·1 answer
  • Hey need help. this is ONE question a 4 part one though. pls help
    10·2 answers
  • If the ΔH for
    14·1 answer
  • When a radioactive atom emits a beta particle, the original atom's atomic number
    12·1 answer
  • Match the following parts of an atom to their description.
    6·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!