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
Artyom0805 [142]
3 years ago
6

Consider the reaction 2Al(OH)3(s)→Al2O3(s)+3H2O(l) with enthalpy of reaction ΔHrxn∘=21.0kJ/mol What is the enthalpy of formation

of Al2O3(s)?
Chemistry
2 answers:
bekas [8.4K]3 years ago
8 0
Google knows your answer
adell [148]3 years ago
7 0

<u>Answer:</u> The enthalpy of the formation of Al_2O_3(s) is coming out to be -399.5 kJ/mol.

<u>Explanation:</u>

Enthalpy change is defined as the difference in enthalpies of all the product and the reactants each multiplied with their respective number of moles. It is represented as \Delta H^o

The equation used to calculate enthalpy change is of a reaction is:  

\Delta H^o_{rxn}=\sum [n\times \Delta H^o_f_{(product)}]-\sum [n\times \Delta H^o_f_{(reactant)}]

For the given chemical reaction:

2Al(OH)_3(s)\rightarrow Al_2O_3(s)+3H_2O(l)

The equation for the enthalpy change of the above reaction is:

\Delta H^o_{rxn}=[(1\times \Delta H^o_f_{(Al_2O_3(s))})+(3\times \Delta H^o_f_{(H_2O(l))})]-[(2\times \Delta H^o_f_{(Al(OH)_3(s))})]

We are given:

\Delta H^o_f_{(H_2O(l))}=-285.5kJ/mol\\\Delta H^o_f_{(Al(OH)_3(s))}=-1277kJ/mol\\\Delta H^o_{rxn}=21.0kJ

Putting values in above equation, we get:

21.0=[(1\times \Delta H^o_f_{(Al_2O_3(s))})+(3\times (-285.8))]-[(1\times (-1277))]\\\\\Delta H^o_f_{(Al_2O_3(s))}=-399.5kJ/mol

Hence, the enthalpy of the formation of Al_2O_3(s) is coming out to be -399.5 kJ/mol.

You might be interested in
In the diagram, which letter represents the energy of the products?
inessss [21]

Answer:

D

Explanation:

8 0
3 years ago
Read 2 more answers
What are the advantages and disadvantages of using an egg to model organelles in an animal c of using an egg to model organelles
aleksandrvk [35]
I think its because an egg doesnt have the right chemical make up
7 0
3 years ago
Increasing the amount of current flowing through a wire strengthens
vagabundo [1.1K]

Answer:

It will strengthen Electromagnetism

8 0
3 years ago
Four glass tanks contain water. In which tank is the pressure of the water on the base greatest.
Svetllana [295]
If it’s a multiple choice question A is the correct answer

4mx2mx3m
7 0
2 years ago
What is the molarity of the bleach solution of slide 28 (7.4% NaOCl by mass, density 1.12 g.cm-3)?
Anuta_ua [19.1K]

Answer:

Molarity of solution is 1.10x10⁻³ M

Explanation:

Solute NaOCl

7.4% by mass means, that in 100 grams of solution, we have 7.4 g of solute.

Molar mass of NaOCl = 74.45 g/m

Mol = Mass / Molar mass

7.4 g / 74.45 g/m = 0.099 moles

Density of solution = 1.12 g/mL

Density = Mass / volume

1.12g/mL = 100 g / volume

Volume = 100 g / 1.12g/mL = 89.3 mL

Molarity = mol /L

89.3 mL = 0.0893 L

0.099 moles / 0.0893 L = 1.10x10⁻³ M

3 0
3 years ago
Read 2 more answers
Other questions:
  • Why is Fluorine, chlorine, bromine, and iodine grouped together?
    11·1 answer
  • Carbon dioxide (CO2) is a gaseous compound. Calculate the percent composition of this compound. Answer using three significant f
    11·2 answers
  • Which of the following factors used in a dimensional analysis calculation have a finite number of significant figures (in other
    5·1 answer
  • if a drop of blood is 0.05 mL, how many drops of blood are in a blood collection tube that holds 6 mL?
    15·1 answer
  • Molecules that are optically active due to the tetrahedral arrangement of bonds around the carbon atom are often referred to as
    10·1 answer
  • Which of the following four orbitals is FURTHEST from the nucleus?
    9·1 answer
  • How do sodium and potassium ions transfer in and out of an axon?
    8·1 answer
  • As you move from left to right within a period (row), what is the pattern?
    11·1 answer
  • What is the name of CF7
    13·2 answers
  • MAGNESIUM (Mg)<br> +FLUORINE (F) =
    14·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!