CHEMISTRY HIGH SCHOOL

Given the lattice energy of NaCl = 787 kJ/mol, the ionization energy of Na = 496 kJ/mol and the electron affinity of Cl = −349 kJ/mol, calculate the ΔH o for the reaction: Na(g) + Cl(g) → NaCl(s)

Answers

Answer 1

Answer:

Answer : The value of $\Delta H_f^o$ for the reaction is, -640 KJ/mole

Explanation :

The steps involved in the formation of $NaCl$ :

(1) Conversion of gaseous sodium atoms into gaseous sodium ions.

$Na(g)\overset{\Delta H_I}\rightarrow Na^(+1)(g)$

$\Delta H_I$ = ionization energy of sodium = 496 kJ/mol

(2) Conversion of gaseous chlorine atoms into gaseous chlorine ions.

$Cl(g)\overset{\Delta H_E}\rightarrow Cl^-(g)$

$\Delta H_E$ = electron affinity energy of chlorine = -349 kJ/mol

(3) Conversion of gaseous cations and gaseous anion into solid sodium chloride.

$Na^(1+)(g)+Cl^-(g)\overset{\Delta H_L}\rightarrow NaCl(s)$

$\Delta H_L$ = lattice energy of sodium chloride (always negative) = -787 kJ/mol

To calculate the overall energy the equation used will be:

$\Delta H_f^o=\Delta H_I+\Delta H_E+\Delta H_L$

Now put all the given values in this equation, we get:

$\Delta H_f^o=496KJ/mole+(-349KJ/mole)+(-787KJ/mole)$

$\Delta H_f^o=-640KJ/mole$

Therefore, the value of $\Delta H_f^o$ for the reaction is, -640 KJ/mole

Related Questions

When astronomers observe distant galaxies, they can tell the most of them are moving away from one another. In addition, the more distant the galaxies, the more rapidly they are likely to be moving away from each other. Can you devise a hypothesis to explain these observation?
How much heat energy is produced by 0.5 Wh of electrical energy
How many moles of tungsten atoms are in 4.8 × 1023 atoms of tungsten?
Which factor most influenced the economicdevelopment of the colonial South?(1) plentiful forests(2) warm and wet growing seasons(3) rich deposits of iron ore and coal(4) abundant water power for manufacturing
What is inferring means in science

A 10.0 mL syringe contains 0.10 g of nitrogen gas at 0.0 degrees Celsius. What is the pressure inside the syringe?

Answers

Since the sample inside the syringe is a gas, we assume that it is an ideal gas that is we use the expression PV = nRT. We can easily calculate the pressure as follows:

n = m /MM = 0.10 / 28 = 0.0036 mol

P = nRT / V = 0.0036(0.08206)(273.15) / 0.010
P = 8 atm

Answer:

The correct answer is 8.0 atm.

8. Conclusions Why is it helpful to know how much carbon monoxide (CO) was produced, even though silicon is the product being collected for industrial use?

Answers

It is helpful to know how much carbon monoxide (CO) was produced because it signifies incomplete combustion therefore can represent inefficiency of the process and also carbon monoxide is an air pollutant it is very important to control the emission of this gas.

Give two reasons why quarrying is bad for the environment?

Answers

1) The longer the quarrying goes on the less and less recources we will have, soon leading to no more recources

Which of the following adaptations would you expect tofind in an animal in the alpine biome, but not in the taiga

Answers

I think the best answer is migration. In an alpine biome, animals have two problems which is the very cold temperature and the UV rays from the sun. Most alpine animals hibernate and migrate to warmer areas of the mountains when the temperature continues to drop.

Answer:

The transfer of a section of Dna from one organism into the Dna of another organism by scientists is called

Answers

Genetic Modification

the balanced chemical equation for one neutralization reaction. In your equation, which reactant contributed the salt's positive ion? Which one contributes the salt's negative ion?

Answers

Answer:

See the answer below

Explanation:

A neutralization reaction is a reaction that involves acid and base with the production of salt and water as the end products. An example is as below:

HCl + NaOH --> NaCl + H2O

The salt produced here is NaCl. In solution, NaCl will ionize as:

$NaCl --> Na^+ + Cl^-$

Hence, the salt's positive ion (Na+) was contributed by the base (NaOH) while its negative ion (Cl-) was contributed by the acid (HCl).

Final answer:

In a neutralization reaction involving Ba(OH)2 and HNO3, the salt's positive ion comes from the base and the negative ion comes from the acid. In the molecular and net ionic equations, spectator ions, which are unaltered in the process, are included and excluded respectively.

Explanation:

In a neutralization reaction, an acid and a base react to produce water and a salt. Taking the provided reaction of Ba(OH)2 (aq) + 2HNO3(aq) → Ba(NO3)2(aq) + 2H₂O(1), the salt's positive ion (Ba²+), also known as the cation, comes from the the base, Ba(OH)2. The salt's negative ion (NO3-), also known as the anion, comes from the acid, HNO3. This reaction also represents a molecular equation where all reactants and products are represented as neutral substances. A net ionic equation would exclude the spectator ions, ions whose presence is required to maintain charge neutrality but are chemically and physically unaltered by the process.

Learn more about Neutralization Reactions here:

brainly.com/question/11403609

#SPJ12

Other Questions

if you are finding the value of a 10 g piece of metal that has a value of 5 dollars/ 1 gram what would be my final unit

How does the speckled coat of a young deer help it to survive?A) The speckled coat is a form of mimicry. B) This is a physical adaptation that helps a doe recognize her fawn. C) The pattern of the speckled coat is used as a form of warning coloration. D) The speckled coat blends with the light that filters through the forest leaves.

Use exponential notation to express the number 385,500 ha. one significant figure. b. two significant figures. c. three significant figures. d. five significant figures.

The height of a building is 31.0 meters.how tall is the building in kilometers?