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3 years ago

Consider the following reversible reaction. What is the equilibrium constant expression for the given system?

Chemistry

2 answers:

ElenaW [278]3 years ago

6 0

The correct answer is A

ladessa [460]3 years ago

3 0

The question is incomplete. Complete question is attached below
..........................................................................................................................

Answer:
Equilibrium constant (K) is defined as the ratio of concentration of product to concentration of reactant.

For the reaction: 2H2O(g) ↔ 2H2(g) + O2(g)

Equlibrium constant = $\frac{[H_2]^2[O_2]}{[H_20]^2}$

[ ] bracket in above expression indicates concentration.

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Which transition represents a time when water molecules are moving closer together? Frost forms on a window pain. Sleet turns to

Anettt [7]

The correct answer here is C. Dew forms on the grass.

Water is a polar substance, which means it has many unique properties. One of which, is its ability to adhere and cohere to surfaces and substances. This particular question is asking about the cohesive properties of water, meaning it’s ability to stick to itself (through bonding.) The only answer choice that represents a situation where water is linking up with other molecules of water are dew drops. The water comes together using cohesion to form the drop and hen the water’s high surface tension properties meet the dew drop’s shape. The other answer choices describe alternate processes like: freezing, melting, and evaporation, respectively.

I hope this helps! :)

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3 years ago

Which of these is the best evidence that a chemical reactions occurs when coal burns?

laila [671]

Answer:

It’s b even check quizzes

Explanation:

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3 years ago

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AleksAgata [21]

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A. Cracks in rocks will deepen as the roots grow.

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3 years ago

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In the "Méthode Champenoise," grape juice is fermented in a wine bottle to produce sparkling wine. The reaction is the following

prohojiy [21]

Answer:

The pressure inside the wine bottle at 21 °C is 4.8 · 10² atm

Explanation:

Hi there!

We know that 1 mol of CO₂ is produced per mol of produced ethanol.

If the final concentration of ethanol is 13%, let´s calculate how many moles of ethanol are present at that concentration.

A concentration of 13% means that in 100 ml of solution, 13 ml is dissolved ethanol. We have 754 ml of solution, then, the volume of ethanol will be:

754 ml solution · (13 ml ethanol/100 ml solution) = 98 ml ethanol

With the density, we can calculate the mass of ethanol present:

density = mass/ volume

0.79 g/ml = mass / 98 ml

mass = 0.79 g/ml · 98 ml

mass = 77 g

The molar mass of ethanol is 46.07 g/mol, then 77 g of ethanol is equal to:

77 g · (1 mol/46.07 g) = 1.7 mol

Then, the number of moles of CO₂ produced will be 1.7 mol.

Using the equation of the ideal gas law, we can calculate the pressure of CO₂:

P = nRT/V

Where:

P = pressure

n = number of moles

R = ideal gas constant

T = temperature

V = volume

The volume will be the headspace of the bottle (840 ml - 754 ml) 86 ml = 0.086 l.

The temperature in kelvin will be: 21 + 273 = 294 K

The gas constant is 0.082 l atm / K mol

Then:

P = (1.7 mol · 0.082 l atm/K mol · 294 K)/ 0.086 l

P = 4.8 · 10² atm

The pressure inside the wine bottle at 21 °C is 4.8 · 10² atm

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3 years ago

What use is chlorine-36

Grace [21]

Chlorine-36 has been widely used for dating old groundwater.

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3 years ago