Given that delta.g for the reaction below is –957.9 kj, what is delta.gf of h2o? 4nh3(g) 5o2(g) right arrow. 4no(g) 6h2o(g) delta.gf,nh3 = -16.66 kj/mol delta.gf,no = 86.71 kj/mol –228.6 kj/mol –206.4 kj/mol 46.7 kj/mol 90.7 kj/mol

Answers

Answer 1

The valur of energy of formation ΔGf of H₂O is -228.6 kJ/mol.

How we calculate ΔG ?

ΔG of any reaction will be calculated as:

ΔG = Sum of ΔG of products - Sum of ΔG of reactants

Given chemical reaction is:

4NH₃(g) + 5O₂(g) → 4NO(g) + 6H₂O(g)

For this reaction, ΔG will be calculated as:

ΔG = [ΔGf 4(NO) + ΔGf 6(H₂O)] - [ΔGf 4(NH₃) + ΔGf 5(O₂)]

Given that:

ΔG = -957.9 kJ

ΔGf of NH₃ = -16.66 kJ/mol

ΔGf of NO = 86.71 kJ/mol

ΔGf of O₂ = 0 (because it is present in elemental form)

ΔGf of H₂O = let x (to find)

On putting all these values on the above equation, we get

-957.9 = [4(86.71) + 6(x)] - [4(-16.66) + 5(0)]

-957.9 = 346.84 + 6x + 66.64

6x = -957.9 - 346.84 - 66.64

6x = -1,371.38

x = -228.56 = -228.6 kJ/mol

Hence, correct option is (1) i.e. -228.6 kJ/mol.

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Answer 2

Answer:

A) -228.6 kJ/mol

Explanation:

EDGE 2022


Related Questions

The volume of a certain gas is 29.3 liters at STP. what would the volume of the same gas at 1.39 atmospheres and -23.0℃?

A. 23 L
B. 37.3 L
C. 19.3 L
D. 22.4 L

Answers

Option C) 19.3L is the correct answer.

Hence, the final volume of the gas at the standard atmospheres and temperature is 19.3L.

Given the data in the question;

Initial volume of gas; [tex]V_1 = 29.3L[/tex]

At Standard temperature and pressure( STP)

Initial temperature; [tex]T_1 = 273.15K[/tex]Initial pressure; [tex]P_1 = 1.00atm[/tex]

Then

Final pressure; [tex]P_2 = 1.39atm[/tex]Final temperature; [tex]T_2 = -23.0^0C = 250.15K[/tex]

Final Volume; [tex]V_2 = \ ?[/tex]

Combined gas law

Combined gas law combines both Boyle's Law, Charles's Law, and Gay-Lussac's Law. It states that the ratio of the product of volume and pressure and the absolute temperature of a gas is equal to a constant.

It is expressed as;

[tex]\frac{P_1V_1}{T_1} = \frac{P_2V_2}{T_2}[/tex]

To determine the new volume of the gas, we substitute our values into the expression above.

[tex]\frac{P_1V_1}{T_1} = \frac{P_2V_2}{T_2}\\\\P_1V_1T_2 = P_2V_2T_1\\\\1.00atm * 29.3L * 250.15K = 1.39atm * V_2 * 273.15K\\\\7329.395atm.L.K = 379.6785atm.K * V_2\\\\V_2 = \frac{7329.395atm.L.K}{379.6785atm.K} \\\\V_2 = 19.3L[/tex]

Option C) 19.3L is the correct answer.

Hence, the final volume of the gas at the standard atmospheres and temperature is

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The percentage of keys you type correctly is A. accuracy B. correctness C. exactness D. precision WHO EVER GETS THIS EARNS BRAINLIST!

Answers

The answer is A: accuracy

Lithium seems to have dramatic effects on the nervous system, yet our bodies seemingly never evolved to use lithium endogenously, rather focusing on sodium, potassium, and calcium. what is a plausible explanation for this?

Answers

Given its small size and high polarizing power, lithium is only involved in covalent rather than ionic bonds in the body as does sodium, potassium, and calcium.

What is lithium?

Lithium is a metal and a member of group 1 in the periodic table. It is a very small ion hence it has a different chemistry from the rest of the members of the group.

Lithium is not part of any of the biomolecules because given its small size and high polarizing power, it is only involved in covalent rather than ionic bonds in the body as does sodium, potassium, and calcium.

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327 mL of 3.2 M HCl can be diluted to make mL of 2 M HCI.

Answers

Answer:

204,375 mL.

Explanation:

327 mL - 3.2 M

x mL - 2 M

x= (2 M x 327 mL) /3.2 M

x= 204,375 mL.

* look at the photo *

1. saturated solutions of each of the following compounds are made at 20°c. circle the letter(s) of the solution(s), which will form a precipitate upon heating.
a) nacl b) na2so4 c) li2co3 d) sucrose

2. a saturated solution of potassium chloride is prepared in 100.0 g of water at 20°c. if the solution is heated to
50°c, how much more kcl must be added to obtain a saturated solution?

3. a saturated solution of sucrose in 1000.0 g of boiling water is cooled to 20°c. what mass of rock candy will be formed?

Answers

The solubility curve can show the variation of solubility with temperature.

What is a saturated solution?

A saturated solution is one in which there is just enough solute as it can dissolve at a given temperature. The imege is missing hence the question is incomplete.

The solubility curve shows us the solubility of each substance but unfortunately we do not have it hence we can not answer the questions but we do know that the solubility curve can show the variation of solubility with temperature.

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How does an electron move from the ground state to an excited state?

Answers

Answer:

It goes through a process called absorption. This is when an atom absorbs the energy from its surroundings. The electrons move from the ground state to the excited state because of this process. Once the atoms absorb energy, that affects the inner development when shifting to a new state of being.

Explanation:

The process that is known as absorption is when an atom absorbs energy from its surrounding racing it's energy level causing it to go into an excited state or highly-reactive state. When an atom goes through this process, electrons absorb the energy and raise to higher energy levels, therefore raising the stage of itself. This is how it gets into a excited state.

List three reasons why nonvascular plants are important

Answers

Answer:

They are food for some animals. Some animals use them for nesting material. Humans can dry and burn some types of nonvascular plants as a fuel.

Explanation:

Some nonvascular plants produce various nutrients that are passed to the soil and can be used by other plants. Also, nonvascular plants that cover a large surface area help maintain the cohesion of the land by reducing the risk of erosion. Nonvascular plants are also very important to animals.

Reasons for Nonvascular plants being importantNonvascular plants help provide oxygen.This helps other plants and mammals, as well as humans.These plants may also provide mini habitats for smaller organisms, such as worms. Worms benefit off of the soil, which these plants also improve.

                                                 

                                                  Hope it helps

                                                      Be great

How does the presence of a nucleus provide a method of basic cell classification?

Answers

Answer:

Sample Respond: The nucleus maintains the integrity of genes and controls the activities of the cell by regulating gene expression—the nucleus is, therefore, the control center of the cell.

good luck

Explanation:

I got 100 mark as brainiest

How many Hydrogen atoms are there in 3NaOH?​

Answers

Answer:

9   I believe

Explanation:

What is meant by the phrase “a consistent method of measurement"?
A. Things are measured the same way each time.
B. All measurements are in Sl units.
C. Every measurement is exactly the same numerical value.
D. The same person performs all measurements.

Answers

The answer is A for that question

Answer:

A. Things are measured the same way each time.

Explanation:

A container with a volume 2. 0 L is filled with a gas at a pressure of 1. 5 atm. By decreasing the volume of the container to 1. 0 L, what is the resulting pressure? Type in your answer using the correct number of significant figures. Remember to use the formula for Boyle's law: P1V1 = P2V2 atm.

Answers

The resulting pressure of the gas after decreasing the initial volume from 2 L to 1 L is 3 atm.

What is Boyle's Law?

According to the Boyle's Law at constant temperature, pressure of the gas is inversely proportional to the volume of that gas.

For the given question we use the below equation is:

P₁V₁ = P₂V₂, where

P₁ = initial pressure of gas = 1.5 atm

V₁ = initial volume of gas = 2 L

P₂ = final pressure of gas = ?

V₂ = final volume of gas = 1 L

On putting all these values on the above equation, we get

P₂ = (1.5atm)(2L) / (1L) = 3 atm

Hence required pressure of the gas is 3 atm.

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Which two elements will be the most alike and why?




Which two elements will be the most alike and why?





Lithium (Li) and Sodium (Na) because they are both metals and are in the same group

Oxygen (O) and Neon (Ne) because they are both noble gases

Helium (He) and Hydrogen (H) because they are both non-metals and are in the same row.

Answers

Explanation:

The first statement is correct

Li &Na

Draw the structure of the major organic product(s) of the reaction. Grinard's

Answers

Answer:

There is drawing of the major organic product of reaction

A students finds a FeNO3 . 3H2O solution with a 1.8 concentration . She uses a a 2 cm wide cuvette in a colorimeter to measure the absorbance. The molar absorptivity of CuSO4 . 5H2O is 42.243 M-1cm-1

What is the Absorbance of the solution?

Answers

The absorbance of a solution that has a concentration of 1.8 is 152.75.

How to calculate absorbance?

The absorbance of a substance can be calculated using Beer's law equation as follows:

A = εmCl

Where;

A = absorbanceεm = molar absorptivityC = concentration of solutionl = path length

According to this question, the following information are given:

A = ?εm = 42.243 M-1cm-1C = 1.8l = 2cm

A = 42.43 × 1.8 × 2

A = 152.75

Therefore, the absorbance of a solution that has a concentration of 1.8 is 152.75.

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What term describes a solution in which the dissolved solute is in equilibrium with the undissolved solute?

Answers

Saturated solution refer to a solution in which the dissolved solute is in equilibrium with the undissolved solute.

What is a saturated solution?

A saturated solution is a chemical solution that contain maximum amount of a solute which is dissolved in the solvent. The addition of anotheg solute will not dissolve in a saturated solution. The amount of solute that can be dissolved in a solvent to form a saturated solution depends on a variety of factors.

Therefore, Saturated solution refer to a solution in which the dissolved solute is in equilibrium with the undissolved solute

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The term that describes a solution in which the dissolved solute is in equilibrium with the undissolved solute is saturated solution.

What is a saturated solution?

A saturated solution is one in which there is so much solute that it would not dissolve if there was anymore.

When a saturated solution comes into contact with more solute, the extra solute does not dissolve or deposit.

Thus, the term that describes a solution in which the dissolved solute is in equilibrium with the undissolved solute is saturated solution.

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if you are a form of an alto cloud, where in the troposphere would you be located? high middle or low

Answers

Answer:

These clouds extend through the lower and mid-layers of the troposphere bringing rain to the surface below.

Explanation:

The bases of clouds in the middle level of the troposphere, given the prefix “alto,”

These clouds extend through the lower and
mid-layers of the troposphere bringing rain
to the surface below.

A colloid in which a liquid is dispersed in a solid is called a(n)

Answers

Answer:

GEL

Explanation:

A colloid is a type of mixture that consists of insoluble particles in another substance. Liquid dispersed in a colloidal solid is called a gel.

What is gel?

A gel is the dispersion of liquid molecules in a solid medium. It is a type of mixture that includes the suspension of particles in another substance. They are colloid that behaves like solid.

The liquid molecules of the medium become thick and viscous in the solid particles and form aggregates of the particles.

Therefore, colloid in which liquid is dispersed in solid is gel.

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Which option correctly describes the reactants and products of a chemical reaction?.

Answers

Answer:

Chemical reaction occurs when chemical bonds between atoms are formed or broken . The substance that go into a chemical reactions are called reactants, and the substance produced at the end of the reaction are known as the product .

really need help with this

Answers

This is a microscope.

Hope this clears that up for you.

Define acid and base according to lewis theory, arrhenius theory and lawn theory

Answers

Answer:

Three principal theories about acid-base are,

1. Arrhenius theory

2. Bronsted-Lowry theory

3. Lux-Flood definition

4. Lewis theory

5. Usanovich definition

1. According to the Arrhenius, acids give up hydrogen ion in aqueous medium and a base give up hydroxyl ion in its aqueous medium. Examples are aqueous solution of HCl, CH3COOH, PhCOOH, and H2SO4. These give up H+ in an aqueous medium. Aqueous solutions of NaOH, Ca (OH)2 are Arrhenius bases.

Arrhenius theory has some limitations. This theory cannot explain the acidic nature of BF3 or basic behavior of NH3. This theory fails to give any explanation about acidity and basicity which does not produce H+ and OH- in their aqueous solutions.

2. According to the Bronsted-Lowry, an acid releases proton and a base accepts proton. NH3 accepts proton and forms ammonium ion, so ammonia acts as a base.

But this theory also has limitations. According to this theory acidic behavior of BF3 still cannot be explained.

3. Lux-Flood describes the acid-base theories based on oxide ion transformation. It gives clear explanation for acid-bases theories of non-protonic system. According to them, a base will donate the oxygen atom and an acid will accept oxygen atom.

4. According to the Lewis theory, acids are those substances which accept electron pair and base are those substances which donates electron pairs. Lewis theory can explain the acidic nature of BF3. In BF3, B is two electrons short to fulfil its octet. So it can accept a pair of electrons from an electron donating substituent. So it is an electron pair acceptor compound and acts as an acid.

Substances which have π electrons can donate electron pair to an electron deficient substance and acts as a base. Ethylene and acetylene is Lewis bases. AlCl3, PCl3 are Lewis acids.

5. According Usanovich, an acid is some chemical species which would react with bases and yields cations or accepts anions or electrons. A base is some chemical species which would react with acids, yield anions or electrons or combine with cations.

Explanation:

The answer is yes because yes is always right never wrong

Hi hello this system to have to ask question for answers is not good. I’m poor

Answers

Answer:

so what do you need help with?

Explanation:

Answer:

what do you need help with i will try to answer

Explanation:

True or false: Energy is always transferred from high kinetic energy (temperature) too low kinetic energy (low temperature)

Answers

Answer:

true

Explanation:

Temperature is a measure of the average kinetic energy of the molecules, so energy would naturally be transferred from the molecules with more kinetic energy to the molecules with less kinetic energy

calculate the number of mole and molecule in 10g water​

Answers

Answer:

1 mole of water weighs 18g. 10/18 moles = 10/18 * 6 * 10^23 number of molecules = 3.33 * 10^23 molecules of water. Each molecule of water has 3 atoms, so the total number of atoms in 10g of water is 3*3.33*10^23 = 10^24.

Explanation:


Place the following in order of decreasing radius.

Te2- F- O2-

Answers

Answer:

Option 2 is correct.

HELPSPEPEP ILL BRAINLIST!!!

Explain the scale of recycling that is currently present in Australia and predict how traditional industries could be affected by an increase in recycling in Australia.

make it short and simple pls. ty.

Answers

Answer:

Negative impacts include: noise, air and odour pollution from collection and reprocessing facilities; costs to set up recycling infrastructure and education materials for new areas; and costs associated with innovations and technologies, which are likely to be passed on to end consumers in product prices.

Explanation:

How many atoms are there in 12 moles of sulfur

Answers

There are 191,017 atoms across the 12 moles of sulfur

A mixture of hydrochloric acid and lithium hydroxide produces lithium chloride and water. How many moles of water are produced from 3.25 moles of hydrochloric acid?

Answers

If a mixture of hydrochloric acid and lithium hydroxide produces lithium chloride and water, 3.25 moles of water are produced from 3.25 moles of hydrochloric acid.

How to calculate number of moles?

According to this question, a mixture of hydrochloric acid and lithium hydroxide produces lithium chloride and water. The balanced chemical equation is as follows:

HCl + LiOH = LiCl + H2O

Based on the above equation, 1 mole of HCl produces 1 mole of water.

3.25 moles of HCl will produce 3.25 moles of H2O.

Therefore, a mixture of hydrochloric acid and lithium hydroxide produces lithium chloride and water, 3.25 moles of water are produced from 3.25 moles of hydrochloric acid.

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What element is commonly used to reduce iron oxide?

Answers

Answer:

The element that is commonly used to reduce iron oxide would be carbon.

Explanation:

:)

Iron oxide is reduced to a lower oxide or metal by gaseous carbon monoxide or solid carbon.

What is Reduction?

Reduction is defined as the chemical reaction which involves addition of hydrogen or removal of oxygen or gain of electrons.

For example,

2Na + H2 → 2NaH (addition of hydrogen)

CuO + H2 → Cu + H2O(removal of oxygen)

Fe3+ + e- → Fe2+ (gain of electron)

Above example of reduction reaction is when oxygen reacts with iron to form rust. In this reaction oxygen is reduced because it accepts electrons from iron, which is oxidized.

Thus, Iron oxide is reduced to a lower oxide or metal by gaseous carbon monoxide or solid carbon.

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How are oceans and salt marshes different? B A Salt marshes have deeper water than oceans. Salt marshes have shallower water than oceans. Salt marshes have more organisms than oceans. D . Salt marshes have more wave action than oceans. С​

Answers

Answer:

Salt marshes have shallower water than oceans

Explanation:

oceans go way deeper then salt marshes with the deepest part of thr ocean at 35,876ft deep

Answer: Salt marshes have shallower water than oceans.

Explanation: oceans are deeper

guys can you help me to fill in the missing blanks

Answers

Answer:

Silver NitratePotassium HydroxideAmmonium ChlorideCalcium CarbonateCopper NitrateAmmonium HydroxideAmmonium NitrateSodium Sulfate
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