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3 years ago

What is the enthaply of dissolution?

Chemistry

2 answers:

solmaris [256]3 years ago

8 0

The enthalpy of solution, enthalpy of dissolution, or heat of solution is the enthalpy change associated with the dissolution of a substance in a solvent at constant pressure resulting in infinite dilution.
The enthalpy of solution is most often expressed in kJ/mol at constant temperature. The energy change can be regarded as being made of three parts, the endothermic breaking of bonds within the solute and within the solvent, and the formation of attractions between the solute and the solvent. An ideal solution has a null enthalpy of mixing. For a non-ideal solution it is an excess molar quantity.

aev [14]3 years ago

7 0

Answer:

The enthalpy change of solution refers to the amount of heat that is released or absorbed during the dissolving process (at constant pressure).

Explanation:

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Can someone solve this problem 5

Westkost [7]

Answer:

Step-by-step explanation:

A. Moles before mixing

Beaker I:

Moles of H⁺ = 0.100 L × 0.03 mol/1 L

= 3 × 10⁻³ mol

Beaker II:

Beaker II is basic, because [H⁺] < 10⁻⁷ mol·L⁻¹.

H⁺][OH⁻] = 1 × 10⁻¹⁴ Divide each side by [H⁺]

[OH⁻] = (1 × 10⁻¹⁴)/[H⁺]

[OH⁻] = (1 × 10⁻¹⁴)/(1 × 10⁻¹²)

[OH⁻] = 0.01 mol·L⁻¹

Moles of OH⁻ = 0.100 L × 0.01 mol/1 L

= 1 × 10⁻³ mol

B. Moles after mixing

H⁺ + OH⁻ ⟶ H₂O

I/mol: 3 × 10⁻³ 1 × 10⁻³

C/mol: -1 × 10⁻³ -1 × 10⁻³

E/mol: 2 × 10⁻³ 0

You have more moles of acid than base, so the base will be completely neutralized when you mix the solutions.

You will end up with 2 × 10⁻³ mol of H⁺ in 200 mL of solution.

C. pH

[H⁺] = (2 × 10⁻³ mol)/(0.200 L)

= 1 × 10⁻² mol·L⁻¹

pH = -log[H⁺ ]

= -log(1 × 10⁻²)

= 2

6 0

3 years ago

Which of the following is true regarding a voltaic (or galvanic) cell? a) It can only be used with hydrogen. b) It produces elec

N76 [4]

Answer:

b) It produces electrical current spontaneously.

Explanation:

Cells capable of converting chemical energy to electrical energy and vice versa are termed Electrochemical cells. There are two types of electrochemical cells viz: Galvanic or Voltaic cells and Electrolytic cells. Voltaic cell is an elctrochemical cell capable of generating electrical energy from the chemical reaction occuring in it.

The voltaic cell uses spontaneous reduction-oxidation (redox) reactions to generate ions in a half cell that causes electric currents to flow. An half cell is a part of the galvanic cell where either oxidation or reduction reaction is taking place. Hence, the spontaneous production of electric currents is true about Voltaic/Galvanic cells.

3 0

3 years ago

A mixture 21.2 g of P and 79.0 g Cl2 reacts completely to form PCl3 and PCl5 as the only products. find the mass of PCl3

IRISSAK [1]

Considering the definition of reaction stoichiometry and limiting reagent, the mass of PCl₃ that could be formed is 38.26 grams.

In first place, you must know that the balanced reaction is:

4 Cl₂ + 2 P → PCl₃ + PCl₅

By reaction stoichiometry (that is, the relationship between the amount of reagents and products in a chemical reaction), the following amounts of moles of each compound participate in the reaction:

Cl₂: 4 moles
P: 2 moles
PCl₃: 1 mole
PCl₅: 1 mole

The molar mass of the compounds is:

Cl₂: 70.9 g/mole
P: 31 g/mole
PCl₃: 137.35 g/mole
PCl₅: 208.25 g/mole

Then, by reaction stoichiometry, the following mass quantities of each compound participate in the reaction:

Cl₂: 4 moles× 70.9 g/mole = 283.6 grams
P: 2 moles× 31 g/mole= 62 grams
PCl₃: 1 mole× 137.35 g/mole= 137.35 grams
PCl₅: 1mole× 208.25 g/mole= 208.25 grams

The limiting reagent is one that is consumed first in its entirety, determining the amount of product in the reaction. When the limiting reagent is finished, the chemical reaction will stop.

To determine the limiting reagent, it is possible to use a simple rule of three as follows: if by stoichiometry 62 grams of P reacts with 283.6 grams of Cl₂, 21.2 grams of P reacts with how much mass of Cl₂?

$mass of Cl_{2}=\frac{21.2 grams of Px283.6 grams of Cl_{2} }{62 grams of P}$

mass of Cl₂= 96.97 grams

But 96.97 grams of Cl₂ are not available, 79 grams are available. Since you have less mass than you need to react with 21.2 grams of P, Cl₂ will be the limiting reagent.

Then, it is possible to determine the mass of PCl₃ produced by another rule of three, using the limiting reagent: if by stoichiometry 283.6 grams of Cl₂ produce 137.35 grams of PCl₃, 79 grams of Cl₂ how much mass of PCl₃ will be formed?

$mass of PCl_{3}=\frac{137.35 grams of PCl_{3}x79 grams of Cl_{2} }{283.6grams of Cl_{2}}$

mass of PCl₃= 38.26 grams

In summary, the mass of PCl₃ that could be formed is 38.26 grams.

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3 years ago

How are an acid and a base define and describe the nature of each based on the strength, pH, and ion concentration?

Stels [109]

here are some notes i took on acids and bases and salts...i hope this helps

3 0

3 years ago

Which one is correct Lewis diagram for CO2

Shkiper50 [21]

Answer:

a correct Lewis diagram for CO2 would look something like this

Explanation:

One C and 2 O. Both O have 4 extra dots and 2 lines/bonds to the C. C has no extra dots.

Hope this helps!

6 0

3 years ago

What is the enthaply of dissolution? ​

What is the enthaply of dissolution?