CHEMISTRY HIGH SCHOOL

For the reactions system 2H2(g) + S2(g) 2H2S(g), a 1.00 liter vessel is found to contain 0.50 moles of H2, 0.020 moles of S2, and 68.5 moles of H2S. Calculate the numerical value of the Keq of this system. K =
Are the products or reactants favored?

The equilibrium system N2O4(g) 2NO2(g) was established in a 1.00-liter vessel. Upon analysis, the following information was found: [NO2] = 0.500 M; [N2O4] = 0.0250 M. What is the value of Keq?

3.Which is the correct expression for Keq when the chemical reaction is as follows:
N2 + 3H2 2NH3.

4.Reactions which do not continue to completion are called ______reactions.

Answers

Answer 1
Answer:

Answer: 1) 2H_2(g)+S_2(g)\rightleftharpoons 2H_2S(g)

Equilibrium constant is defined as the ratio of the product of concentration of products to the product of concentration of reactants each term raised to their stochiometric coefficients.

K_(eq)=([H_2S]^2)/(H_2]^2* [S_2])

where [] = concentration in Molarity=\frac{moles}{\text {Volume in L}}

Thus [H_2S]=(68.5)/(1.0)=68.5M

[H_2]=(0.50)/(1.0)=0.50M

[S_2]=(0.020)/(1.0)=0.020M

K_(eq)=([68.5]^2)/(0.50]^2* [0.020])=938450

As the value of K is greater than 1, the reaction is product favored.

2) N_2O_4(g)\rightleftharpoons 2NO_2(g)

K_(eq)=([NO_2]^2)/([N_2O_4])

K_(eq)=([0.500]^2)/([0.0250])=10

3) N_2+3H_2\rightleftharpoons 2NH_3

K_(eq)=([NH_3]^2)/([N_2]* [H_2]^3)

4) Reactions which do not continue to completion are called equilibrium reactions as the rate of forward reaction is equal to the rate of backward direction.
Answer 2
Answer: For reaction ax + by <=> cz + dm, the calculation of Keq is ( [z]^(c) [m]^(d) )/([x]^(a) [y]^(b) ). So the first Keq is 938450. The Second Keq is 10. The third expression is [NH3]2/([N2][H2]3). The last one is reversible.

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The molar mass of blood sugar, C6H12O6 also known as glucose and dextrose is

Answers

The molar mass is calculated by looking up the relative atomic mass values on a periodic table. The relative atomic mass is a value without units that is calculated on a Carbon-12 scale.

By looking at the periodic table (values will be to 3 significant figures [2 for hydrogen though]):
Molar mass (M) of 1 mole of Carbon = 12.0 g/mol
Molar mass (M) of 1 mole of Hydrogen = 1.0 g/mol
Molar mass (M) of 1 mole of Oxygen = 16.0 g/mol

So the molar mass is essentially the relative atomic mass (RAM), but molar mass has a unit, but RAM doesn't (it is a ratio).

Given the formula is C6H12O6 (without putting the numbers as subscripts), we can calculate as follows:
M (C6H12O6) = (6 x 12.0) + (12 x 1.0) + (6 x 16.0)
                       = 72.0 + 12.0 + 96.0
                       = 180.0 g/mol

Hope it's right :D

Final answer:

The molar mass of glucose, also known as blood sugar and dextrose, is calculated by summing the respective molar masses of carbon, hydrogen, and oxygen in one molecule of glucose. It is approximately 180.16 g/mol.

Explanation:

The molar mass refers to the mass, in grams, of one mole (6.022 x 1023 molecules) of a substance. For glucose (C6H12O6), we calculate it by summing up the molar masses of individual elements, multiplying each by their respective number of atoms in one molecule of glucose.

The molecular masses of carbon (C), hydrogen (H), and oxygen (O) are approximately 12.01 g/mol, 1.008 g/mol, and 16.00 g/mol respectively. So the molar mass of glucose is calculated as follows: (6*12.01 g/mol) + (12*1.008 g/mol) + (6*16.00 g/mol) = 72.06 g/mol + 12.10 g/mol + 96.00 g/mol = 180.16 g/mol.

So, the molar mass of glucose, C6H12O6, also known as blood sugar and dextrose, is approximately 180.16 g/mol.

Learn more about Molar Mass here:

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Exactly 15.0 g of a substance can be dissolved in 150.0 g of water what is the solubility of the substance in grams per 100 g of water

Answers

The solubility of the substance in grams per 100g of water = 10g

Calculating solubility of water

The solubility of water is the amount of chemical substance that can dissolve to go a solution in the it at a specific temperature.

The quantity of substance given in grams= 15g

This is able to dissolve in water = 150g

Therefore the quantity of the substance that would dissolve in 100g of water = X g

Make X g the subject of formula= 15 × 100/150

= 1500/150

= 10g

Learn more about solubility here:

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(15.0 g) / (150.0 g) x (100 g) = 10.0 g/100 g H2O 

Which of the following statements about elements and atoms is true?

Answers

Atoms of different elements are different based on the number of protons they have in their nucleus. This number, known as the atomic number, is unique to each element and defines its identity.

The modern atomic theory states that atoms of one element are the same, while atoms of different elements are different. What makes atoms of different elements different? The fundamental characteristic that all atoms of the same element share is the number of protons.

All atoms of hydrogen have one and only one proton in the nucleus; all atoms of iron have 26 protons in the nucleus. This number of protons is so important to the identity of an atom that it is called the atomic number (Z).

The number of protons in an atom is the atomic number of the element. Thus, hydrogen has an atomic number of 1, while iron has an atomic number of 26. Each element has its own characteristic atomic number.

Answer:

the first one

Explanation:

Chapter 2.4.1. The ______ energy lost by the inward movement of nickel-iron within a differentiating molten planetary body would be converted first into _______ energy and then into ______ energy. a. momentum, thermal, gravitational b. gravitational, kinetic, thermal c. thermal, momentum, kinetic d. kinetic, thermal, gravitational

Answers

Answer:b. gravitational, kinetic, thermal

Explanation:

The above explains the mechanism of the core forming process on earth/planet.

It is believed that this process might has contributed significantly to a planet's early stages heating. The time when these core-forming event happened is thought to have been mainly completed very early when Earth was young . The type of this event rather than it being seen as a single catastrophic event, it is likely to have been as a result of contractions on the earth severally.

The addition of partially differentiated material from another giant impact the rate of this spasm , and it increases each time the planet's mass is to increased.

This is a little on the history of planetary evolution.

What is the mass percent of chlorine in magnesium chloride?

Answers

The total mass of magnesium chloride is 95.21g/mol

The mass of chlorine is 35.45g/mol

To find the mass percent of chlorine, divide its molar mass by the total mass of the substance and multiply the result by 100:
(35.45/95.21)(100)= 37.2%

Which activity performed by a chemist is primarily based on an understanding of physics?

Answers

physical science, is the study of the composition, structure, properties and change of matter.[1][2] Chemistry is chiefly concerned with atoms and their interactions with other atoms - for example, [ the properties of the chemical bonds formed between atoms to create chemical compounds. As well as this, interactions including atoms and other phenomena - electrons and various forms of energy—are
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