Given the reaction below: N2O4 (g) ⇌ 2 NO2 (g)Kc= 4.2
What is the equilibrium concentration of N2O4 if the equilibrium concentration of NO2 is 0.785 M?

Answers

Answer 1

Answer: N₂O₄ (g) ⇌ 2 NO₂ (g)

Kc = [ NO₂ ]² / [ N₂O₄ ]

4.2 = [ 0.785 ] [ N₂O₄ ]

[ N₂O₄ ] = 4.2 / 0.785

[N₂O₄ ] = 5.350 M

hope this helps!

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What does it mean that valence electrons in a metal are delocalized?

Answers

Delocalized means that electrons in the metal are not linked only to a single atom or in a bond. Electrons are free to move and around the crystal structure and carry currents. This is why, in metals, there is a term "electron sea".

Answer:

Explanation:

Which of the following statements about ionic bonds is false?A) the resulting compound in a water solution can conduct electricity.
B) the resulting compound cannot be dissolved in water.
C) the resulting compound forms solid crystals.
D) the resulting compound has high melting and boiling points.

Answers

The answer is B) the resulting compound cannot be dissolved in water. Ionic compounds are, in fact, very soluble in water. They are known to dissociate in aqueous solutions, producing ions or charged atoms. This makes aqueous solutions of ionic compounds good conductors of electricity. As solids, ionic compounds form salt crystals. They have high melting and boiling points due to the strong ionic bond that holds them.

There are no negative consequences to using nuclear energy.

true or false

Answers

false..........
it has so many consequences

False hope this helps

The chief function of muscles is _____.contraction
absorption
excretion
protection

Answers

Answer:

The correct answer is the first option: contraction.

Explanation:

Hello!

Let's solve this!

Muscles are structures or tissues with a main function that is to contract. This happens so that we can perform each of our movements.

They are divided into smooth muscles and skeletal muscles.

We conclude that the correct answer is the first option: contraction.

Ammonia and sulfuric acid react to form ammonium sulfate. Determine the starting mass of each reactant if 20.3 g of ammonium sulfate is produced and 5.89g of sulfuric acid remains unreacted.

Answers

Answer: The mass of ammonia is 5.236 g and that of sulfuric acid is 15.064 g

Explanation:

Calculating the mass of ammonia:

To calculate the number of moles, we use the equation:

$\text{Number of moles}=\frac{\text{Given mass}}{\text{Molar mass}}$ .....(1)

Given mass of ammonium sulfate = 20.3 g

Molar mass of ammonium sulfate = 132.14 g/mol

Putting values in equation 1, we get:

$\text{Moles of ammonium sulfate}=(20.3g)/(132.14g/mol)=0.154mol$

The chemical equation for the reaction of ammonia and sulfuric acid follows:

$2NH_3+H_2SO_4\rightarrow (NH_4)_2SO_4$

As, sulfuric acid remains unreacted, which means it is an excess reagent and its starting mass cannot be determined from ammonium sulfate.

By Stoichiometry of the reaction:

1 mole of ammonium sulfate is produced by 2 moles of ammonia.

So, 0.154 moles of ammonium sulfate is produced by = $(2)/(1)* 0.154=0.308mol$ of ammonia.

Now, calculating the mass of ammonia from equation 1, we get:

Molar mass of ammonia = 17 g/mol

Moles of ammonia = 0.308 moles

Putting values in equation 1, we get:

$0.308mol=\frac{\text{Mass of ammonia}}{17g/mol}\n\n\text{Mass of ammonia}=5.236g$

Calculating the mass of sulfuric acid

Law of conservation of mass states that mass can neither be created nor be destroyed but it can only be transformed from one form to another form.

This also means that total mass on the reactant side must be equal to the total mass on the product side.

Let the mass of sulfuric acid be 'x' grams

We are given:

Mass of ammonium sulfate = 20.3 grams

Mass of ammonia = 5.236 grams

Total mass on reactant side = 5.236 + x

Total mass on product side = 20.3 g

So, by applying law of conservation of mass, we get:

$5.236+x=20.3\n\nx=15.064g$

Hence, the mass of ammonia is 5.236 g and that of sulfuric acid is 15.064 g

2NH₃ + H₂SO₄ ⇒ (NH₄)₂SO₄
34.06g : 98.08g : 132.14g
x y 20.03g

x = [20.03g*34.06g]/132.14g = 5.16g

5.16g + y = 20.03g ⇔ from stoichiometric ratio
20.03g - 5.16g = y
y = 14,87g + 5.89g = 20.76g ⇔ 5.89g of sulfuric(VI) acid remains unreacted

Starting mass:

mNH₃ = 5.16g
mH₂SO₄ = 20.76g

What happens when the kinetic energy of molecules increases so much that electrons are released by the atoms, creating a swirling gas of positive ions and negative electrons?