Help Asha balance the following equation by completing the equation with the correct numbers:__H2 + __O2equation __H2O

Answers

Answer 1

Answer: 2 H₂ + O₂ ⇒ 2 H₂O

Explanation:

H₂ + O₂ ⇒ H₂O

There needs to be the same amount of each atom on both sides of the equation.

Step 1

There are 2 oxygen atoms on the left side of the equation and 1 oxygen atom on the right side of the equation.

Place a 2 in front of H₂O on the right side of the equation to balance the oxygen atoms.

H₂ + O₂ ⇒ 2 H₂O

Now the oxygen atoms are balanced, with 2 on each side of the equation.

Step 2

H₂ + O₂ ⇒ 2 H₂O

There are 2 hydrogen atoms on the left side of the equation and 4 hydrogen atoms on the right side of the equation (2 x 2 = 4).

Place a 2 in front of H₂ on the left side of the equation.

2 H₂ + O₂ ⇒ 2 H₂O

Now the hydrogen atoms are balanced.

The entire equation is balanced because there are equal numbers of each atom on both sides of the equation.


Related Questions

(population projection) the u.s. census bureau projects population based on the following assumptions: - one birth every 7 seconds - one death every 13 seconds - one new immigrant every 45 seconds write a program to display the population for each of the next five years. assume the current population is 312,032,486 and one year has 365 days. hint: in java, if two integers perform division, the result is an integer. the fractional part is truncated. for example, 5 / 4 is 1 (not 1.25) and 10 / 4 is 2 (not 2.5). to get an accurate result with the fractional part, one of the values involved in the division must be a number with a decimal point. for example, 5.0 / 4 is 1.25 and 10 / 4.0 is 2.5. sample run population after 1 year: 3.148125827032967e8 population after 2 years: 3.1759267940659344e8 population after 3 years: 3.2037277610989016e8 population after 4 years: 3.2315287281318676e8 population after 5 years: 3.259329695164835e8 class name: exercise01 11

Answers

program to display the population for each of the next five years. Assume the current population is 312,032,486 and a year consists of 365 days:

public class Exercise_11 {

  public static void main(String[] strings) {

      double birthRateInSeconds = 7.0;

      double deathRateInSeconds = 13.0;

      double newImmigrantInSeconds = 45.0

      double currentPopulation = 312032486;

      double secYears = 60 * 60 * 24 * 365;

      double numBirths = secondsInYears / birthRateInSeconds;

      double numDeaths = secondsInYears / deathRateInSeconds;

      double numImmigrants = secondsInYears / newImmigrantInSeconds;

      for (int i = 1; i <= 5; i++) {

          currentPopulation += numBirths + numImmigrants - numDeaths;

          System.out.println("Year " + i + " = " + (int)currentPopulation);

      }

  }

}

What is population?

A population is the entire collection of humans, whether that group is a nation or a group of people who share a feature. A population in statistics is the group of people from which a statistical sample is taken for a research. Population refers to the total number of people who live in a specific place at any one moment.

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you learned in the lab that macromolecules are large molecules that are made up of smaller subunits. the smaller subunits are combined into macromolecules in a reaction called dehydration synthesis. the macromolecules are broken down into their building blocks in a reaction called hydrolysis.

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You learned in the lab that macromolecules are large molecules that are made up of smaller subunits. the smaller subunits are combined into macromolecules in a reaction called dehydration synthesis. the macromolecules are broken down into their building blocks in a reaction called hydrolysis. True. Macromolecules are formed by small unit atoms forming larger molecules. Dehydration synthesis results in the formation of large molecules from smaller molecules, and hydrolysis results in the formation of smaller molecules from large molecules.

Macromolecule are atoms that tend to form larger molecules form polymers with covalent bonds. The number of monomers that combine can reach tens of thousands so that the relative molecular mass can reach hundreds of thousands, even millions.

Dehydration synthesis is the formation of larger molecules with the release of water molecules. Several smaller molecules form covalent bonds with each other by releasing a molecule of water per each bond to form a complex compound. While, Hydrolysis is the breaking of chemical bonds in the presence of water. Large molecules are always broken down into smaller molecules using water as a reactant. When a large molecule is hydrolyzed there will be two small molecules.

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How many moles of atoms are present in 3 moles of Ca(NO3)2
moles.

Answers

Answer: In 3 moles of Ca(NO3)2, there are 24 moles of atoms.

Explanation:  This is because:

1 mole of Ca(NO3)2 contains 1 mole of calcium (Ca), which has 1 mole of atoms

1 mole of Ca(NO3)2 contains 2 moles of nitrate (NO3), which has 6 moles of atoms

So in total, 1 mole of Ca(NO3)2 contains 1 + 6 x 2 = 13 moles of atoms.

Therefore, 3 moles of Ca(NO3)2 contains 3 x 13 = 39 moles of atoms.

A certain reaction has the following general form.
aA → bB
At a particular temperature and [A]0 = 2.57 ✕ 10-3 M, concentration versus time data were collected for this reaction, and a plot of 1/[A] versus time resulted in a straight line with a slope value of +3.39 ✕ 10-2 L/mol · s.

(b) Calculate the half-life for this reaction.

(c) How much time is required for the concentration of A to decrease to 7.43 ✕ 10-4 M?

Answers

Answer:

Rate law: r= k[A]^2

Integrated rate law: 1/[A] = kt + 1/[A]0

Rate constant: k= 3.40x10^-2 L/mol*s

Explanation:

Hello,

In this case, since the slope is obtained by plotting 1/[A] and it has the units L/(mol*s) or 1/(M*s), we can infer the reaction is second-order, therefore, its rate law is:

The integrated rate law:

That is obtained from the integration of:

And of course, since the slope equals the rate constant, its value is:

The diagram shows the major divisions of the periodic table. Which of the
following divisions is most likely to contain elements that are malleable and
ductile?
OA. A
OB. B
OC. Both B and C
D. C

Answers

Answer:

A is the answer

Explanation:

The elements in Group 1 of the periodic table are the alkali metals. Group 1 metals are shiny, malleable, and ductile. their elemental form and are stored in substances that are unreactive, such as an oil. Each atom of an alkali metal has one electron in its outer energy level

The following data were obtained when a sample of barium chloride hydrate was analyzed as described in the Procedure section. Mass of empty test tube Mass of test tube and hydrate (before heating) Mass of test tube and anhydrous salt (after heating) 18.42 g 20.75 g 20.41 g Calculate (a) the original mass of the hydrate, (b) the mass of water lost upon heating, and (c) the experimental percent water in the hydrate.

Answers

The following data were obtained when a sample of barium chloride hydrate was analyzed as described in the Procedure section. Mass of empty test tube Mass of test tube and hydrate (before heating) Mass of test tube and anhydrous salt (after heating) 18.42 g 20.75 g 20.41 g Calculate :

(a) Original mass of the hydrate = mass of test tube and hydrate (before heating) - mass of empty test tube = 20.75 g - 18.42 g = 2.33 g(b) Mass of water lost upon heating = original mass of the hydrate - mass of anhydrous salt = 2.33 g - 20.41 g = -18.08 g(c) Experimental percent water in the hydrate = (mass of water lost upon heating / original mass of the hydrate) * 100% = (-18.08 g / 2.33 g) * 100% = -776.9%

Note: The percent water in the hydrate should not be negative, so this calculation must be incorrect.

What is Anhydrous Salt?

Important terms in studying hydrated water are as follows: 1. Anhydrous salt is a salt that has lost water molecules, this salt is formed from the decomposition of heated hydrate salts 2. Hydrate salts are salts that have a fixed number of water molecules in each molecule.

Compounds that contain water of crystals are called hydrates, while compounds that do not contain water of crystals are called anhydrous compounds

The word element in Greek is stoicheion, while stoichiometry or stoichiometry has the meaning of measuring elements which include several things, namely atomic mass, molecular mass, empirical formula, molecular formula, concentration, number of moles, reaction equations and everything related to chemical reactions. The number of particles present in a substance in stoichiometry is called moles.

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application software presents information in a slideshow format used to create, compose, edit, format, and print documents electronic grid of columns and rows collection of related files performs particular tasks users need

Answers

The application software is likely a spreadsheet software.

Spreadsheet software is a type of application software used to create, organize, and analyze data in a tabular form. It presents information in a grid of rows and columns, similar to a paper spreadsheet, which allows users to easily enter and manipulate data.

Some of the most common features of spreadsheet software include formulas and functions for calculations, the ability to format cells, sort and filter data, create charts and graphs, and collaborate with others.

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The phase of a substance depends on the relative magnitudes of the molecular _________________ and the energy of intermolecular attractions.
Select the correct answer below:
mass
volume
kinetic energy
pressure

Answers

Option (C) is correct. The phase of a substance depends on the relative magnitudes of the molecular Kinetic energy and the energy of intermolecular attractions.

The phase of a substance depends on the balance between the kinetic energy of the individual particles and the intermolecular forces. The kinetic energy keeps the molecules apart and keeps moving around. That is the function of the temperature of the substance and the intermolecular forces try to draw the particles together. The kinetic energy is defined as the energy that possesses due to the motion of an object. This energy is defined as the work needed to accelerate a body of a given mass from rest to its stated velocity. An intermolecular force is defined as an attractive force that arises between the positive components of one molecule and the negative components of another molecule.

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A 125 g sample of ground beef contains 26.2 grams of protein and 31.5 grams of fat. Assume the ground beef contains only protein, fat, and water.
a. How many grams of water are in the beef sample?
b. Calculate the percentage of fat, by mass, in the ground beef.
c. Calculate the percentage of water, by mass, in the ground beef.
d. Calculate the percentage of protein, by mass, in the sample of beef?
e. How many grams of fat are in a 6.2 oz sample of this beef

Answers

There are 67.3 grams of water (a), the percentage of fat is 25.2%  (b), the percentage of water is  53.84% (c), the percentage of protein is 20.96%(d), and there are grams of fat  44.22 grams(e).

How many grams of water are there?

26.2 + 31.5 = 57.7 - 125 = 67.3 grams of water

What percentage does each nutrient represent?


Knowing the total 125 represents 100%, let's calculate the percentages:

Fat: 31.5 x 100 /125 = 25.2%

Protein: 26.2 x 100 / 125 = 20.96%

Water: 67.3 x 100 / 125 = 53.84%

How many grams of fat are there in a 6.2 oz sample of this beef?

6.2 ounces = 175.76 grams (1 ounce = 28.34 grams)

125 = 31.5

175.75 = x

x = 31.5 x 175.5 / 125 = 44.22 fat grams

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The pressure of 134 mL of a sample of carbon dioxide is increased from 485 mm Hg to 1,222 mm Hg. Calculate the new volume of the carbon dioxide.

Answers

The new volume of a gas when the pressure is increased is 53.2 mL.

What is the new volume of a gas when the pressure is increased?

The new volume of a gas when the pressure is increased is determined using the formula from Boyle's law given below:

P₁V₁ = P₂V₂

where;

P₁ is the initial pressure

V₁ is the initial volume

P₂ is the new pressure

V₂ is the new volume

Solving for V₂:

V₂ = P₁V₁/P₂

V₂ = 134 * 485 / 1222

V₂ = 53.2 mL

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How many moles are in 78.3g of ammonium sulfite?

Answers

Answer:

0,6746 moles of ammonium sulfite

Explanation:

(NH₄)₂SO₃  - ammonium sulfite [tex]\equiv \, N_2H_8SO_3[/tex]

Atomic weight of each element:

N = 14.00 * 2  = 28

H = 1.00   * 8  = 8

S = 32.065 * 1 = 32.065

O = 16 * 3 =  48

Total atomic weight = 28 + 8 + 32.065 + 48

Total atomic weight = 116,065 gr/mol

[tex]78.3\,g \,* \frac{1mol\,of\, (NH_4)_2SO_3}{116.065g \, \,of \, (NH_4)_2SO_3 } \approx 0,6746\, moles \, of \, (NH_4)_2SO_3[/tex]

Calorimetry a 25g sample of gold is heated,then placed in a calorimeter containing 60.g of water. Temperature of water increases from 18.00 c to 20.00C how much heat energy was lost by the sampls of gold?

Answers

Based on the principle of calorimetry, the heat lost by the gold is 502.08 J.

What is the heat change that occurred when the temperature of the water increased?

The heat change that occurred when the temperature of the water increased is calculated using the formula below:

Heat change = mass * specific heat capacity * temperature change

The mass of water = 60.0 g

The specific heat capacity of water = 4.184 J/g/°C

The temperature change of water = (20 - 18)°C

The temperature change of water = 2°

Heat change = 60 * 4.184 * 2

Heat change = 502.08 J

From the principle of calorimetry, the heat lost by the gold is equal to the heat gained by the water.

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c.) If Rudy is chasing a tennis ball at an average speed of 10 mi h¹, and I throw it 0.01 miles away
from me, how long (in seconds) will it take him to return to me (assuming Rudy was right beside
me and no change in his speed throughout the chase)?
A: 7.2

Answers

The initial speed of a tennis ball is 53.6 m/s and the launch angle is theta =21 degrees.

When a tennis ball strikes the ground, how much speed does it lose?

The serve speeds displayed on courtside digital monitors are calculated as soon as the ball exits the racquet. Fortunately for returners, by the time the ball reaches them, air resistance and court surface friction have reduced its speed by around 50%.

The tennis ball must subsequently bounce to a height of between 135 cm and 147 cm, implying a velocity of between 5.14 m/s and 5.36 m/s when it leaves the ground, according to the rules.

Average speed is calculated by dividing the total distance traveled by the body by the time required to cover that distance.

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Find the mass in 4.5 mol of NaOH (show work pls)

Answers

The mass in 4.5 mol of NaOH is 180g.

How to calculate mass?

The mass of a substance can be calculated by multiplying the molar mass of the substance by the number of moles as follows:

mass = molar mass × no of moles

Moles refers to the amount of substance of a system which contains exactly 6.022 10²³ elementary entities.

molar mass of NaOH = 40g/mol

mass = 40g/mol × 4.5mol

mass = 180grams.

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How does solar energy travel from the solar to the earth. ​

Answers

Answer:

by using glass to reflect to the sun

I need help please!!

Answers

The formula of the compound formed from K and P is K₃P. Potassium and oxygen is K₂O and the compound formed from potassium and F is KF.

What are ionic compounds?

Ionic compounds are formed between metals and non-metals. Metals donate their valence electron to non-metals. Potassium, K forms the compound with Br as KBr, by donating one electron to bromine. Formula of compound between K and N  is K₃N and that between K and S is K₂S

Similarly the table can be filled as follows:

compounds of sodium: Na₃P,  Na₂O, NaF, NaBr, Na₃N and Na₂S.

compounds of Mg : Mg₃P₂, MgO, MgF₂, MgBr₂, Mg₃N₂, MgS

compounds of Al : AlP, Al₂O₃, AlF₃, AlBr₃, AlN, Al₂S₃

Compounds of Fe : FeP, FeO, FeF, FeBr, FeN, FeS.

compound of Cu : CuP, CuO, CuF, CuBr, CuN, CuS

and compounds of Ba are: Ba₃P₂, BaO, BaF₂, BaBr₂, Ba₃N₂,BaS

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hi! im struggling to answer these please help!


1. Write a nuclear equation for the alpha decay of 231-91Pa.


2. Write a nuclear equation for the alpha decay of 146-62Sm


3. Write a nuclear equation for the alpha decay of 149-62Sm.


4. Write a nuclear equation for the alpha decay of 150-64Gd.


5. Write a nuclear equation for the alpha decay of 249-101Md.

Answers

This was the best I can do.

1. 231-91Pa -> 227-89Ac + 4-2He
2. 146-62Sm -> 142-60Nd + 4-2He
3. 149-62Sm -> 145-60Nd + 4-2He
4. 150-64Gd -> 146-62Sm + 4-2He
5. 249-101Md -> 245-99Bk + 4-2He

Which of the following statements about a chemical reaction is/are correct?
Energy is absorbed from the surroundings to break bonds
Forming bonds is an endothermic process
more energy is involved in breaking bonds than in forming bonds

Answers

Energy is absorbed from the surroundings to break bonds is the statements about a chemical reaction or endothermic is correct.

What does it mean to  break bonds in endothermic?

The process of breaking bonds is termed as endothermic. When new bonds are formed, energy is released. The process of creating bonds is exothermic. The difference between the energy required for breaking a bonds and the energy released while the new bonds form determines whether a reaction may be defined as endothermic or exothermic.

When atoms are swapped to create chemically distinct species, chemical bonds are broken, new ones are established, and a chemical reaction takes place. These two procedures are both chemical reactions.

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Which of the following is an example of the law of multiple proportions?a. The atomic mass of bromine is found to be 79.90 amu.b. Two different compounds formed from carbon and oxygen have the following mass ratios: 1.33 grams of O to 1 gram of C, and 2.66 grams of O to 1 gram of C.c. A sample of chlorine is found to contain three times as much Cl-35 as CI-37.d. Two different samples of table salt are found to have the same ratio of sodium to chlorine.e. Nitrogen dioxide always has a mass ratio of 2.28 grams of O to 1 gram of N.

Answers

Option b is an example of the law of multiple proportions. when the two different compounds formed from carbon and oxygen have the following mass ratios: 1.33 grams of O to 1 gram of C, and 2.66 grams of O to 1 gram of C.

Law of multiple proportions: When two elements will combine to generate more than one compound, the weights of the one element that will combine with a fixed weight of the other are in a ratio of the tiny whole numbers, according to the law of multiple proportions.

The English scientist John Dalton will established the rule in 1803; its validation over a wide range of compounds is regarded as the most strong evidence in the support of Dalton's idea in which matter is made up of indivisible atoms.

For example: Let us suppose two molecules of CO and CO₂.

CO = 12 gram of carbon + 16 gram of oxygen

CO₂ = 12 gram of carbon + 32 gram of oxygen

Ratio of the mass of oxygen in the given two compounds will be 16 : 32 = 1 : 2

Thus, the law of multiple proportions will be proved.

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Please help me on this

Answers

The light colored panel reflects light and heats up, while the dark colored panel absorbs the light and stays cooler. This temperature difference causes the vanes to spin.

Describe how the light and dark colored panels affect how the radiometer spins.

The dark panel absorbs the incoming light, while the light panel reflects it. Due to this, the two panels' temperatures differ, with the dark panel becoming hotter than the light panel.

Due to the pressure difference caused by the temperature difference, air molecules move from the hot, dark panel to the cool, light panel. The radiometer's associated vanes spin as a result of this air flow.

The radiometer will spin more quickly the greater the temperature differential between the two panels. The temperature differential between the two panels is higher in a vacuum, enabling the radiometer to spin more quickly.

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the heat of solution is the total enthalpy change when a solution is formed from the separated solute and solvent.

Answers

The heat of solution is the total enthalpy change when a solution is formed from the separated solute and solvent is true statement.

It is true that the overall enthalpy change that occurs when a solution is created from a separated solute and solvent is known as the heat of solution. The change in enthalpy that occurs when 1 mol of solute (component 1) dissolves in a solvent is known as the enthalpy of solution (or heat of solution) (component 2).

The amount of heat that can be emitted or absorbed when a solution dissolves is simply referred to as the enthalpy change of the solution. At a constant temperature, the enthalpy of a solution is typically represented as kJ/mol.

Three essential steps are necessary for the enthalpy of a solution:

1. Solute separation: This is the breakdown of the solute. The solute is no longer held together by any intramolecular forces in this situation.

2. Solvent separation: This occurs when all intramolecular forces holding the solvent together are broken as a result of the breakdown of the solvent.

3. Mixing: To create a solution, the solute and the solvent are combined in this instance.

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Which of the following oxides are likely to be acidic, basic or amphoteric in aqueous solution: (a) MgO; (b) SnO; (c) CO2; (d) P2O5; (e) Sb2O3; (f) SO2; (g) Al2O3; (h) BeO? Briefly rationalize each of your choices.

Answers

Acidic oxides are Carbon dioxide([tex]CO_{2}[/tex]), Phosphorus pentoxide([tex]P_{2}$O_{5}[/tex]) and Sulfur dioxide([tex]S$O_{2}[/tex] ).

Basic oxide are Magnesium Oxide(MgO).

Amphoteric oxides are Tin(Stannum) Oxide(SnO), Antimony trioxide([tex]Sb_{2} $O_{3}[/tex]), Aluminum oxide([tex]Al_{2} O_{3}[/tex] ) and Beryllium oxide(BeO).

Magnesium Oxide(MgO) is a basic oxide.

Magnesium is a metal that, like the majority of metals, forms simple oxides.

Tin(Stannum) Oxide(SnO) is amphoteric oxide.

Since SnO reacts with both HCl (an acid) and NaOH (a base) to produce salt and water, its amphoteric nature may be demonstrated.

Carbon dioxide([tex]CO_{2}[/tex]) itself is not an acid, because it does not contain hydrogen ions (H +), but instead transforms into carbonic acid when dissolved in water. Water and carbon dioxide combine to generate carbonic acid, which makes the solution acidic.

Phosphorus pentoxide([tex]P_{2}$O_{5}[/tex]) is an acidic oxide.

Because it is an anhydride of phosphoric acid, phosphorus pentoxide is an acidic oxide that is employed as a desiccating and dehydrating agent.

Antimony trioxide([tex]Sb_{2} $O_{3}[/tex]) is an amphoteric.

It dissolves in aqueous sodium hydroxide solution to produce the trihydrate of the meta-antimonite [tex]NaSbO_{2}[/tex].

Sulfur dioxide([tex]S$O_{2}[/tex] ) is an acidic oxide.

[tex]S$O_{2}[/tex]  occurs spontaneously during volcanic eruptions and is mostly caused by the burning of fossil fuels. The lungs can be harmed by [tex]S$O_{2}[/tex]  inhalation.

Aluminum oxide([tex]Al_{2} O_{3}[/tex] ) is an amphoteric oxide'

This substance possesses both acidic and basic properties. The other reactant in the chemical reaction determines whether [tex]Al_{2} O_{3}[/tex] is basic or acidic.

Beryllium oxide(BeO) is an amphoteric oxide.

While most group II elements create basic oxide, BeO is an amphoteric oxide.

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which three of the following statements about autotrophs and heterotrophs on earth are true?select 3 correct answer(s)question 6 options:the majority of autotrophs on earth require aerobic respiration in order to survive.heterotrophs are dependent on autotrophs to generate o2 from h2o in order to support aerobic respiration.heterotrophs evolved on earth before autotrophs.heterotrophs depend on autotrophs for conversion of light energy to chemical energy.there are no metabolic differences between autotrophs and heterotrophs.heterotrophs that do not eat autotrophs every day will die in a short time.autotrophs depend on heterotrophs to oxidize sugar and release co2 into the atmosphere.the majority of heterotrophs on earth do not use aerobic respiration as a form of energy conversion.

Answers

Below are the three true assertions concerning autotrophs and heterotrophs on earth.

In order to support aerobic respiration, heterotrophs depend on autotrophs to produce O2 from H2O. They also depend on autotrophs to convert light energy to chemical energy. The bulk of Earth's autotrophs need aerobic respiration to survive.

Autotrophic plants use the energy from the sun and uncomplicated substances like carbon dioxide and water to store energy in food (glucose and starch). Instead of getting their energy from other living things, they get it directly from sunshine.

An organism is referred to as a heterotroph if it consumes other plants or animals for food and energy. Its origins are in the Greek words hetero, which means "other," and trophe, which means "nutrition."

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Which of the following reactions would have a decrease in entropy? A 2S*O_{3}(g) -> 2S*O_{3}(g) + O_{3}(g); 2N*H_{3}(g) -> N_{3}(g) + 3H_{3}(g); 2N*O_{2}(g) -> N_{3}*O_{4}(g) D. 2H_{g}*O(g) -> 2H_{g}(g) + O_{g}(g)

Answers

Answer:

D. 2H_{g}*O(g) -> 2H_{g}(g) + O_{g}(g)

The reaction 2N*H_{3}(g) -> N_{3}(g) + 3H_{3}(g) would have a decrease in entropy. In this reaction, the number of moles of gas on the right side of the equation is greater than on the left side, so the entropy increases. The other reactions would have an increase in entropy.

Find ΔrH for the combustion of naphthalene at 298 K

Answers

The  ΔrH for the combustion of compound of  naphthalene at 298 K is -5133 kJ/mole which is a standard value.

What is a compound?

Compound is defined as a chemical substance made up of identical molecules containing atoms from more than one type of chemical element.

Molecule consisting atoms of only one element is not called compound.It is transformed into new substances during chemical reactions. There are four major types of compounds depending on chemical bonding present in them.They are:

1)Molecular compounds where in atoms are joined by covalent bonds.

2) ionic compounds where atoms are joined by ionic bond.

3)Inter-metallic compounds where atoms are held by metallic bonds

4) co-ordination complexes where atoms are held by co-ordinate bonds.

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What are the properties of the aluminum in the can? Check all that apply

Answers

Answer: If you are looking for the number its 13.

Explanation:

if you can show your question for better understanding

The selection is 1-10 for the question

Answers

The number that would be written in front of the water in the formula is 2.85

How to calculate?

The mass of the hydrate is 1.55 g,

the mass of the anhydrate (CoCl2) is 1.11 g and

the mass of the water lost is 0.44 g.

We will use the information to calculate the number of moles of each substance present in the hydrate.

1.11 g of CoCl2 is equal to 1.11 g / ( molecular weight of CoCl2) = moles of CoCl2

= 1.11/ 129.839 g/mol

= 0.00854 moles of CoCl2

0.44 g of water is equal to 0.44 g / ( molecular weight of H2O) = moles of water

=  0.44 / 18.015

= 0.0244 moles of water

x = moles of water / moles of CoCl2

x = 2.85

The number that would be written in front of the water in the formula is 2.85

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How many moles of Fe₂O3 are produced when 0.75 mol O₂ reacts with iron?

Answers

When 0.75 mol O₂ reacts with iron, it will produce 1.5 moles of Fe₂O3.

What is moles?

Moles are small, burrowing mammals found throughout much of the world. They have a cylindrical body, covered in short, velvety fur, and stocky legs. They have a rounded snout and small eyes, and their fur is usually black, brown, or gray. Moles feed mainly on earthworms, insects, and grubs, and use their powerful front paws to dig extensive tunnel systems in gardens and lawns. Moles are solitary creatures, living and foraging alone, and they are active both day and night.

This is because the balanced chemical equation for the reaction is: 2Fe + 3O₂ → Fe₂O₃. Since there is a 2:3 ratio of iron atoms to oxygen atoms, for every 0.75 moles of oxygen, 1.5 moles of Fe₂O₃ will be produced.

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a hot and concentrated solution of kbr was slowly cooled down to facilitate the crystallization of kbr, as the kbr crystals grew, the entropy of the system (the mixture of water and kbr) will group of answer choices stay the same decrease there is not enough information. increase

Answers

As the KBr crystals form from the hot and concentrated solution, the entropy of the system decreases. This is because the process of crystal formation is an ordered process, leading to a decrease in the number of available microstates, thus reducing entropy. As the solution cools, the solute molecules slow down and start to arrange themselves into a highly ordered lattice structure, which results in the formation of KBr crystals. This decrease in entropy is compensated by an increase in the entropy of the surroundings, such as the air or the container, in order to maintain the overall increase in entropy required by the second law of thermodynamics.

About Kbr

Potassium bromide (KBr) is widely used in life, one example is in the form of salt. Potassium bromide, is a typical ionic salt. This salt is completely dissociated and approaches pH 7 in aqueous solution. This compound serves as a source of bromide ion.

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How many moles are in 1.75 kg of iron Hint:mass of Fe/ MW Fe (55.85g)

Answers

There are around 31 moles in 1.75 kg of iron.

Molecular Mass is equal to 1 mole.

So, no. of moles = mass given/ molecular mass.

∴ no. of moles = 1.75 / (55.85 ÷ 1000)

∴ no. of moles = 31.33

What is molecular mass?

The total sum of the mass of all the atoms present in a substance is called molecular mass.

What is mass?

Mass is the quantity of matter in a body.

What is mole?

Mole is the amount of substance which contains as many entities as there are atoms in 0.012 kilogram of carbon 12

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