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
olya-2409 [2.1K]
2 years ago
15

Calculate the ΔH o for the reaction: Fe3+(aq) + 3OH−(aq) → Fe(OH)3(s) ΔH o = kJ/mol Substance ΔH o f (kJ/mol) ΔG o f (kJ/mol) S

o (J/K·mol) Fe(s) 0 0 27.2 Fe2+(aq) −87.86 −84.9 −113.39 Fe3+(aq) −47.7 −10.5 −293.3 FeCl3(s) −400 −334 142.3 FeO(s) −272.0 −255.2 60.8 Fe2O3(s) −822.2 −741.0 90.0 Fe(OH)2(s) −568.19 −483.55 79.5 Fe(OH)3(s) −824.25 ? ? H(g) 218.2 203.2 114.6 H2(g) 0 0 131.0 H+(aq) 0 0 0 OH−(aq) −229.94 −157.30 −10.5
Chemistry
1 answer:
timofeeve [1]2 years ago
8 0

Answer:

ΔHr = -86.73 kJ/mol

Explanation:

Using Hess's law, you can calculate ΔH of any reaction using ΔH°f of products and reactants involed in the reaction.

<em>Hess law: ∑nΔH°f products - ∑nΔH°f reactants = ΔHr</em>

<em>-Where n are moles of reaction-</em>

For the reaction:

Fe³⁺(aq) + 3 OH⁻(aq) → Fe(OH)₃(s)

Hess law is:

ΔHr = ΔH°f Fe(OH)₃ - ΔH°f Fe³⁺ - 3×ΔH°f OH⁻

Where:

ΔH°f Fe(OH)₃: −824.25 kJ/mol

ΔH°f Fe³⁺: −47.7 kJ/mol

ΔH°f OH⁻: −229.94 kJ/mol

Replacing:

ΔHr = −824.25 kJ/mol - (−47.7 kJ/mol) - (3×-229.94 kJ/mol)

<em>ΔHr = -86.73 kJ/mol</em>

You might be interested in
Why does mass decrease when sugar dissolved in water
kap26 [50]

Answer:

Because the same amount of sugar is still there. The solid sugar crystals break apart in water as the sugar dissolves, but the individual sugar particles or molecules are still present and do not change as a result of dissolving in the water. The combined mass of the sugar and water shouldn't change.

7 0
3 years ago
What physical properties does lithium have
Ipatiy [6.2K]

Answer:

Lithium has a melting point of 180.54 C, a boiling point of 1342 C, a specific gravity of 0.534 (20 C), and a valence of 1. It is the lightest of the metals, with a density approximately half that of water. Under ordinary conditions, lithium is the least dense of the solid elements.

Appearance: soft, silvery-white metal

Atomic Number: 3

Atomic Radius (pm): 155

8 0
3 years ago
What kind of chemical bond is found between paired bases of the dna double helix?
zimovet [89]
Hydrogen. Covalent bonds occur within each linear strand and strongly bond the bases, sugars, and phosphate groups (both within each component and between components). Hydrogen bonds occur between the two strands and involve a base from one strand with a base from the second in complementary pairing.
3 0
3 years ago
What happens to gas particles when a gas is compressed?
Dmitrij [34]
The volume decreases
7 0
3 years ago
ANSWER FAST!!
belka [17]

Answer: 800 mL of methyl alcohol should be added to 200 ml of water to make this solution.

Explanation:

Volume of the methyl alcohol = x

Volume of water = y = 200 mL

Volume of the solution ,V = x + y

Volume percentage of solution = 80%

x = 800 mL

800 mL of methyl alcohol should be added to 200 ml of water to make this solution.

4 0
2 years ago
Other questions:
  • When fossil fuels are burned, they produce______________, the main greenhouse gas responsible for global warming trends.
    7·2 answers
  • In these zones, high solar elevation angles occur throughout the year, and this makes ________ consistently warm.
    12·1 answer
  • What is the oxidation state of each element in COH2?
    14·1 answer
  • What is an example of a neutralization reaction?
    15·1 answer
  • The colourless coating on a photographic film contains a chemical substance which reacts upon exposure to light, causing the fil
    5·1 answer
  • How much pressure (in atm) would be found in 5.8 moles of an ideal gas at 358 K and volume of 3.9 L?
    6·1 answer
  • 11. Which one of the following contains the same number of atoms as 7 g
    15·1 answer
  • Hi there! could someone help with this? its due today.
    12·2 answers
  • The heating curve shows the energy gain of a substance as it changes from solid to gas. Which section of graph shows the liquid
    8·1 answer
  • A student delivered 17.06 mL (V1) of 7.16 % stock solution (M1) using a graduated pipette into a 50.00 mL (V2) volumetric flask.
    15·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!