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
xz_007 [3.2K]
3 years ago
13

Calculate ΔH (in kJ) for the process Hg2Br2(s) → 2 Hg(l) + Br2(l) from the following information.

Chemistry
2 answers:
Ilia_Sergeevich [38]3 years ago
8 0

Answer : The enthalpy change of reaction is 206.9 kJ

Explanation :

According to Hess’s law of constant heat summation, the heat absorbed or evolved in a given chemical equation is the same whether the process occurs in one step or several steps.

According to this law, the chemical equation can be treated as ordinary algebraic expression and can be added or subtracted to yield the required equation. That means the enthalpy change of the overall reaction is the sum of the enthalpy changes of the intermediate reactions.

The given final reaction is,

Hg_2Br_2(s)\rightarrow 2Hg(l)+Br_2(l)    \Delta H=?

The intermediate balanced chemical reaction will be,

(1) Hg(l)+Br_2(l)\rightarrow HgBr_2(s)    \Delta H^o_1=-170.7kJ

(2) Hg(l)+HgBr_2(s)\rightarrow Hg_2Br_2(s)    \Delta H^o_2=-36.2kJ

First we will reverse the reaction 1 and 2 then adding both the equation, we get :

(1) HgBr_2(s)\rightarrow Hg(l)+Br_2(l)    \Delta H^o_1=+170.7kJ

(2) Hg_2Br_2(s)\rightarrow Hg(l)+HgBr_2(s)    \Delta H^o_2=+36.2kJ

The expression for final enthalpy is,

\Delta H=\Delta H^o_1+\Delta H^o_2

\Delta H=(+170.7kJ)+(+36.2kJ)

\Delta H=206.9kJ

Therefore, the enthalpy change of reaction is 206.9 kJ

Natasha_Volkova [10]3 years ago
5 0

<u>Answer:</u> \Delta H^o_3 is 206.3 kJ.

<u>Explanation:</u>

According to Hess’s law of constant heat summation, the heat absorbed or evolved in a given chemical equation is the same whether the process occurs in one step or several steps.

According to this law, the chemical equation can be treated as ordinary algebraic expression and can be added or subtracted to yield the required equation. That means the enthalpy change of the overall reaction is the sum of the enthalpy changes of the intermediate reactions.

Hg(l)+Br_2(l)\rightarrow HgBr_2(s)    \Delta H^o_1=-170.7kJ   ......(1)

Hg(l)+HgBr2(s)\rightarrow Hg_2Br_2 \Delta H^o_2=-36.2kJ  .......(2)

The final reaction is:  

HgBr_2(s)\rightarrow 2Hg(l)+Br_2(l)  \Delta H^o_3=?   ......(3)

By reversing both the equations and then adding them, we get:

\Delta H^o_3=-\Delta H^o_1+(-\Delta H^o_2)=-(-170.7)+[-(-36.2kJ)]=206.3kJ

Hence, \Delta H^o_3 is 206.3 kJ.

You might be interested in
Write a summary of a toms​
Dmitrij [34]

atoms consist of protons and neutrons in the nucleus , surrounded by electrons that reside in orbitals . Orbitals are classified according to the four quantum number s that represent anyone particular orbitals energy , shape , orientation and the spin of the occupying electron.

hope this helps xx

3 0
4 years ago
What information does a subscript in a chemical formula provide? Choose all that apply. * The charge of that atom while in the c
Sloan [31]

Answer:

B. How many of each atom are present in the compound

D. the simplified ratio of atoms in relation to each other

Explanation:

In a chemical formula, chemical elements or atoms are represented by a chemical symbol for example Fe for iron and Na for sodium, and the number of each atom is represented by a subscript such as CO2, where 2 is a subscript representing 2 atoms of oxygen.

A subscript represents the number of each atom in the compound and the simplified ratio of atoms in relation to each other. The simplified ratio of atoms in relation to each other means subscript shows the contribution of both the atoms in the compound, for example: N2 + 3H2 => 2NH3, it means the subscript showing the ratio or proportionate of atoms that is 2:2 for both nitrogen and hydrogen.

The subscript is always written below and to the right of the chemical symbol.

Hence, the correct answer is "B. How many of each atom are present in the compound and D. the simplified ratio of atoms in relation to each other"

3 0
3 years ago
What is a kind of biochemical that does not dissolve in water and makes up cell walls fats oils and waxes?
posledela
Lipids is a kind of biochemical that does not dissolve in water and makes up the cell walls fats oil and waxes
5 0
3 years ago
What is the wavelength of light that has a frequency of 3.7 x 1014 Hz? Show all work!!!
kramer

Answer:

Explanation:

f=\frac{c}{\lambda}=>\lambda=\frac{c}{f}=\frac{300x10^8\frac{m}{s}}{3.7*10^{14}\frac{1}{s}}=810.8108*10^{-9}m

3 0
3 years ago
Read 2 more answers
2 attempts left Click the "draw structure" button to launch the drawing utility. Draw one product formed when the following dien
Yuliya22 [10]

Answer:

2-chloro-1-methyl-cyclohex-1,4-diene.

Explanation:

Hello,

In this case, the addition of hydrochloric acid acts as an electrophilic atack in which the hydrogen bonded to the double-bonded carbon connected to the carbon with the methyl substitution is substituted by the chlorine from the hydrochloric acid, in such a way, 2-chloro-1-methyl-cyclohex-1,4-diene is produced as one equivalent of HCl is used therefore one substitution will be attained for chlorine, and hydrogen as a side product as shown on the attached picture.

Best regards.

7 0
3 years ago
Other questions:
  • Using the information on page 508, describe a way to make a universal indicator that would tell you the ph of a solution between
    9·1 answer
  • What is Avagrados Number?
    7·2 answers
  • Which best describes an element
    5·1 answer
  • This is a question in Seneca, plz help asap bc I can't skip it!!
    5·1 answer
  • Three samples of wood with the same volume were weighed. Sample A has a mass of 224.96 g, sample B has a mass of 0.55632 Ibs, an
    5·1 answer
  • Please help me on this problem:)
    10·1 answer
  • I am confuse and need help
    10·1 answer
  • The voltage of a battery can be changed by altering the _____
    8·1 answer
  • A photon has a wavelength of approximately 2 x 10-7m. What is the energy, in joules, associated with this photon?
    10·1 answer
  • Which quantity could best be measured with a meter stick?
    12·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!