What is the correct order of star colors from hottest to coolest?

white, yellow, red, blue
yellow, orange, white, red
red, orange, yellow, blue-white
blue, white, yellow-white, orange

306.178 liters is the volume of O2 at STP, required for the complete combustion of 125g octane (\(C_{8}H_{18}\)) to \(CO_{2}\) and H20

To calculate the volume of \(O_{2}\) required for the complete combustion of octane (\(C_{8}H_{18}\)) to \(CO_{2}\) and \(H_{2}O\) at STP (Standard Temperature and Pressure), we need to consider the stoichiometry of the balanced chemical equation.

The balanced equation for the combustion of octane is:

\(C_{8}H_{18}\) + 12.5\(O_{2}\) -> 8\(CO_{2}\) + 9\(H_{2}O\)

From the equation, we can see that 1 mole of octane requires 12.5 moles of \(O_{2}\) to completely combust. The molar mass of octane (\(C_{3}H_{18}\)) is approximately 114.22 g/mol.

To calculate the moles of octane, we divide the given mass by the molar mass:

Moles of octane = 125 g / 114.22 g/mol ≈ 1.093 mol

Since the molar ratio between octane and \(O_{2}\) is 1:12.5, the moles of \(O_{2}\)required can be calculated as:

Moles of \(O_{2}\) = 1.093 mol * 12.5 ≈ 13.663 mol

Now, we can use the ideal gas law, PV = nRT, to calculate the volume of \(O_{2}\) at STP. At STP, the temperature is 273 K, and the pressure is 1 atm.

Using the molar volume of an ideal gas at STP (22.4 L/mol), the volume of \(O_{2}\) required is:

Volume of \(O_{2}\) = Moles of \(O_{2}\) * Molar volume = 13.663 mol * 22.4 L/mol ≈ 306.178 L

Therefore, approximately 306.178 liters of \(O_{2}\) at STP would be required for the complete combustion of 125 grams of octane (\(C_{8}H_{18}\)) to \(CO_{2}\) and \(H_{2}O\)

Know more about combustion here:

https://brainly.com/question/10458605

#SPJ8

The atomic mass of sulfur trioxide (SO3) is 82 amu.

Sulfur trioxide (SO3) has one sulfur atom and three oxygen atoms.

The atomic mass of sulfur can be calculated by subtracting the total mass of the oxygen atoms in sulfuric acid (3 x 16 amu) from the mass of sulfuric acid (98 amu) and then subtracting the mass of the remaining oxygen atom:

The atomic mass of sulfur is 34 amu.

To find the atomic mass of sulfur trioxide, we add the atomic masses of one sulfur atom and three oxygen atoms:

Therefore, the atomic mass of sulfur trioxide (SO3) is 82 amu.

Learn more about sulfur trioxide here : brainly.com/question/1458186

#SPJ1

Answer: Energy of reactants = 30, Energy of products = 10

Exothermic

Activation energy for forward reaction is 10.

Explanation:

Exothermic reactions are defined as the reactions in which energy of the product is lesser than the energy of the reactants. The total energy is released in the form of heat and \(\Delta H\) for the reaction comes out to be negative.

Energy of reactants = 30

Energy of products = 10

Thus as energy of the product < energy of the reactant, the reaction is exothermic.

Activation energy \((E_a)\) is the extra energy that must be supplied to reactants in order to cross the energy barrier and thus convert to products.

\(E_a\) for forward reaction is (40-30) = 10.

The given reaction releases 906 kJ of heat energy when 4 moles of ammonia react.

So, the amount of heat energy released when 1 mole of ammonia reacts is:

906 kJ ÷ 4 mol = 226.5 kJ/mol

To produce 453 kJ of heat energy, we can use the following proportion:

226.5 kJ/mol = 453 kJ/x

where x is the number of moles of ammonia required.

Solving for x, we get:

x = (453 kJ × 4 mol) ÷ 906 kJ

x ≈ 2 mol

Therefore, 2 moles of ammonia must react to produce 453 kJ of heat energy.

Learn more about balanced equation from

https://brainly.com/question/28722049

#SPJ1

The given reaction releases 906 kJ of heat energy when 4 moles of ammonia react.

So, the amount of heat energy released when 1 mole of ammonia reacts is:

906 kJ ÷ 4 mol = 226.5 kJ/mol

To produce 453 kJ of heat energy, we can use the following proportion:

226.5 kJ/mol = 453 kJ/x

where x is the number of moles of ammonia required.

Solving for x, we get:

x = (453 kJ × 4 mol) ÷ 906 kJ

x ≈ 2 mol

Therefore, 2 moles of ammonia must react to produce 453 kJ of heat energy.

Learn more about balanced equation from

brainly.com/question/28722049

#SPJ1

A.) The solubility of nitrogen at a pressure of 2.00 atm is \(1.36 \times 10^{(-3)} M.\)

B.) The solubility of nitrogen at a pressure of 688 mmHg is \(6.17 \times 10^{(-4)} M.\)

To calculate the solubility of nitrogen (N2) in M (molarity) at different pressures, we need to use Henry's Law, which states that the solubility of a gas in a liquid is directly proportional to the partial pressure of the gas above the liquid. The equation for Henry's Law is:

C = k * P

Where:

C is the solubility of the gas in M (molarity)

k is the Henry's Law constant

P is the partial pressure of the gas

For nitrogen, the Henry's Law constant (k) is approximately 6.8 x 10^(-4) M/atm.

a) To calculate the solubility of nitrogen at a pressure of 2.00 atm:

C = (6.8 x 10^(-4) M/atm) * (2.00 atm)

C = 1.36 x 10^(-3) M

Therefore, the solubility of nitrogen at a pressure of 2.00 atm is 1.36 x 10^(-3) M.

b) To calculate the solubility of nitrogen at a pressure of 688 mmHg:

First, we need to convert mmHg to atm by dividing by 760 (since 1 atm = 760 mmHg).

P = 688 mmHg / 760 mmHg/atm

P = 0.905 atm

C = (6.8 x 10^(-4) M/atm) * (0.905 atm)

C = 6.17 x 10^(-4) M

Therefore, the solubility of nitrogen at a pressure of 688 mmHg is 6.17 x 10^(-4) M.

It's important to note that the solubility of a gas can also depend on temperature, so these calculations assume a constant temperature. Additionally, Henry's Law is an approximation and may not hold true for all gas-liquid systems, especially at high pressures or when there are significant intermolecular interactions between the gas and liquid.

For more question on pressure visit:

https://brainly.com/question/24719118

#SPJ8

The carbohydrate molecule would have more atoms than the glucose molecule.

We need to know what is a monomer and what is a polymer. It is important to note that the polymer is made from the agglomeration of the small units of the compound that combine together.

We ought to know that glucose is a monomer and that carbohydrate is the polymer. The monomer is composed of a few atoms but there are many more atoms in the polymer as the atoms join together. This is because the carbohydrate is made up of many atoms much more than glucose.

Learn more about polymer:https://brainly.com/question/17354715

#SPJ1

Answer: unlike, will not scatter

Explanation:

Colloids are unlike solutions because their dispersed particles are much larger than those of a solution. The dispersed particles of a colloid cannot be separated by filtration, but they scatter light, a phenomenon called the Tyndall effect.

Answer:

312.1 moles H₂ (4 sig.figs. based on -9551Kj value given).

Explanation:

Given N₂(g) + 3H₂(g) => 2NH₃(g);  ΔH° = -91.8Kj*

One mole of H₂ consumed will give -91.8Kj/3 = -30.6Kj/mole (exothermic)

moles H₂ consumed that gives -9551Kj (exothermic) = -9551Kj/-30.6Kj/mole H₂

= 312.124183moles H₂ (calculator answer) ≅ 312.1 moles H₂ (4 sig.figs. based on -9551Kj value given).

*Note: The ∆H° = -91.8 kJ/mol units should be only 'Kj' as the heat flow value applies to substances with three different coefficient values in the standard equation. FYI :-)  

For the production of -9551 kJ energy, 313.55 mol of hydrogen has been consumed.

According to the balanced chemical equation,

3 moles of hydrogen have been consumed to give -91.8 kJ/mol energy.

The energy produced by 1 mole of hydrogen = \(\rm \dfrac{-91.38}{3}\)kJ/mol

The energy produced by 1 mole of hydrogen = -30.46 kJ/mol.

For the production of -30.46 kJ/mol energy, the moles of hydrogen used are 1.

So, for the production of -9551 kJ energy, the moles of hydrogen consumed are:

- 30.46 kJ/mol = 1 mole Hydrogen

-9551 kJ = \(\rm \dfrac{1}{-30.46}\;\times\;-9551\)

= 313.55 moles of hydrogen.

For the production of -9551 kJ energy, 313.55 mol of hydrogen has been consumed.

For more information about heat energy, refer to the link:

https://brainly.com/question/19606835

Answer:

b is the answer

Explanation:

non metals are not shiny, brittle, unmalleable, and are poor conductors of thermal energy and electrical current.

A nonmetal is brittle, dull, and low in density.  

• Non-metals refer to the elements that produce negative ions by gaining or accepting electrons. The non-metals generally possess 4, 5, 6, or 7 electrons in their valence shell. The non-metals are those, which are devoid of all the metallic properties.  

• The non-metals in their solids-state are brittle, thus, they lack ductility and malleability exhibited by the metals.  

• The non-metals are not shiny like metals, they are dull in color.  

• The non-metals seem to possess low density, primarily as non-metals seem to prevail either in a liquid or solid-state. The non-metals lack the dense and closed packing in the lattice, which is seen in metals.  

Thus, non-metals are brittle, dull, and low in density.  

To know more about:

https://brainly.com/question/17811524

Answer:

give more details

Explanation:

Nadia will take 8 seconds to reach her friend's house.

Speed is the measure of the distance traveled by an object per unit of time. It is a scalar quantity and is typically expressed in units such as meters per second (m/s), miles per hour (mph), or kilometers per hour (km/h).

To calculate the time Nadia will take to reach her friend's house, we can use the formula;

time = distance / speed

where distance is the amount of space traveled by an object, and time is the duration of travel.

Put the values given in the problem, we have:

time = 24 meters / 3 m/s

time = 8 seconds

Therefore, Nadia will take 8 seconds.

To know more about time here

https://brainly.com/question/15356513

#SPJ1

A scientist has data for the speed of light and energy variables. E = mc²  form of the equation should the scientist use to determine the mass of an object.

Albert Einstein proposed the theory of relativity, which states that space and time are relative, and that all motion must be relative to a frame of reference.

Mathematically this equation is correct, but in terms of the meaning that people derive from it is totally wrong.

E = mc²

Some statements are mass is a condensed form of energy or energy is available in every mass.

On the original paper that Einstein published that he stated the equation as :

m = E / c²

This implies that the more energy the object has, it’s mass keeps on increasing.

So, mathematically E = mc² is correct, but not physically.

Thus, E = mc² form of the equation should the scientist use to determine the mass of an object.

To learn more about the theory of relativity, follow the link;

https://brainly.com/question/28289663

#SPJ1

Explanation:

three things that you would notice a chemical reaction is the change of color and change in odor and the change in temperature

One mole or 12 g of carbon reacts with one of oxygen molecule weighs 32 g will produce one mole of carbon dioxide. One mole of carbon dioxide weighs 44 g.

Carbon dioxide is an inorganic gas formed by the covalent bonding between carbon and oxygen gas. Carbon dioxide is an essential gas to maintain the living atmosphere in earth.

The balanced chemical equation of the reaction between oxygen gas and carbon is given below:

\(\rm C+O_{2} \rightarrow CO_{2}\)

As per this equation, one mole of carbon reacts with one mole of oxygen gas:

Atomic mass of carbon = 12g

molecular mass of oxygen = 32 g

then molar mass of carbon dioxide = 32+ 12 = 44 h=g.

Therefore, 44 g of carbon dioxide is produced in this reaction.

Find more on CO₂:

https://brainly.com/question/29827893

#SPJ1

Answer:

The empirical formula for the compound is C3H4O3

Explanation:

The following data were obtained from the question:

Carbon (C) = 40.92%

Hydrogen (H) = 4.58%

Oxygen (O) = 54.50%

The empirical formula for the compound can be obtained as follow:

C = 40.92%

H = 4.58%

O = 54.50%

Divide by their molar mass

C = 40.92/12 = 3.41

H = 4.58/1 = 4.58

O = 54.50/16 = 3.41

Divide by the smallest i.e 3.41

C = 3.41/3.41 = 1

H = 4.58/3.41 = 1.3

O = 3.41/3.41 = 1

Multiply through by 3 to express in whole number

C = 1 x 3 = 3

H = 1.3 x 3 = 4

O = 1 x 3 = 3

The empirical formula for the compound is C3H4O3

Answer:

the answer to this is non impact

Answer:

Mass = 365.45 g

Explanation:

Given data:

Number of moles of HNO₃ = 5.8 mol

Mass of HNO₃ = ?

Solution:

Formula:

Mass = number of moles × molar mass

Molar mass of HNO₃ = 63.01 g/mol

by putting values,

Mass = 5.8 mol ×  63.01 g/mol

Mass = 365.45 g

The standard enthalpy change for the reaction 2A+B⇌2C+2D is  664 kJ/mol and The heat that is absorbed when 3.70 mol of A reacts is 2456.8  J

The heat changes that take place as reactants combine to generate a product are measured by the enthalpy of a reaction.

The following formula can be used to determine the enthalpy change of a reaction:

Hess's law states that

Enthalpy of reaction =  product's enthalpy - the reactant's enthalpy.

Considering the given reaction: 2A + B ⇌ 2C + 2D  

Enthalpy of reaction =  product's enthalpy - the reactant's enthalpy.

Enthalpy of reaction (ΔH°f) = (2 C + 2 D) - (2 * A + B)

Enthalpy of reaction  (ΔH°f)  = {[2(223) + 2(-523)] - [2(-245) + 2(-387)]}

Enthalpy of reaction  (ΔH°f)  = 664 kJ/mol

ΔH = q ÷ n

ΔH = molar enthalpy (heat) of solution

q = amount of energy (heat) released or absorbed

n = moles of solute

so. q = ΔH xn

q = ΔH xn

q = 664 kJ/mol x 3.70 mol

Q= 2456.8  J

Learn more about enthalpy of reaction at:

brainly.com/question/14291557

#SPJ1

In order to test for ammonia, a moist red litmus paper should be held over the test tube containing the ammonia.  Option 3.

Ammonia is a substance that is alkaline in nature. All alkaline substances are able to turn red litmus paper to blue. This is in opposition to acidic substances that turn blue litmus paper to red.

Thus, the first test that can be used to determine if a substance is ammonia would be to hold a moist red litmus paper over the test tube containing the suspected substance.

Since ammonia is gas at room temperature, the substance suspected to be ammonia will diffuse from the test tube to turn the moist red litmus paper to blue.

Other methods to test for ammonia include passing a test tube containing hydrochloric acid over the test tube containing the substance. A white fume of ammonium chloride will confirm the presence of ammonia.

More on tests for ammonia can be found here: https://brainly.com/question/29345206

#SPJ1

Answer:

IUPAC name literally is a chemical organic name given to an organic compound bashing on the IUPAC naming rules.

• Brady's reagent → 2,4-dinitrophenylhydrazine

It is used to confirm presence of carbonyl compounds (compounds with a carbonyl carbon).

• Tollen's reagent → Silver ammonical nitrate solution

It is used to distinguish between terminal and non-terminal alkyns (compounds with carbon to carbon tripple bonds)

• Fehling's solution → Copper (II) sulphate and Silver nitrate solution [ Copper (I) nitrate solution ]

It is used to distinguish between alkanols and aldehydes.

Also it distinguishes between terminal and non terminal alkyns

\({}\)

The strand 1 of hydrocarbons is used to produce plastic, hence option D is correct.

Raw resources like natural gas, oil, or plants that have been processed into ethane and propane are used to make plastics. The subsequent "cracking" procedure uses heat to transform ethane and propane into ethylene and propylene. To produce various polymers, these components are mixed.

Propylene is a substance found in large quantities in petroleum. In order to speed up chemical processes, refiners combine heated propylene with a catalyst to create plastic. Propylene molecules start to cluster together like beads on a thread as a result.

Learn more about plastic, here:

https://brainly.com/question/28420086

#SPJ1

Answer:

_ NH4NO3 -> _ N2O + 2 H2O

Explanation:

By having 2 water molecules, we reach the 4 H atoms and 3 O atoms that are present on the left side. We don't add any other coefficients because we already have enough N atoms and we don't have to manipulate the left side at all.

Answer: A. 212

Explanation:

Answer:

PCl₅: 0.1192M

PCl₃: 0.0734M

Cl₂: 0.0734M

Explanation:

Based on the reaction:

PCl₅ ⇄ PCl₃ + Cl₂

K of reaction is defined as:

K = [PCl₃] [Cl₂] / [PCl₅]

Replacing with concentrations of gases in equilibrium:

K = [0.119] [0.119] / [0.313]

K = 0.0452

Moles of each gas is:

PCl₅: 7.40L × (0.313mol / L) = 2.3162 moles

PCl₃: 7.40L × (0.119mol / L) = 0.8806 moles

Cl₂: 7.40L × (0.119mol / L) = 0.8806 moles

When the volume of the container is increased the system will produce more moles, (That is, produce more products) in order to keep constant the pressure of the container -Le Chatelier's principle-. In equilibrium, molarity of each gas is:

PCl₅: 2.3162 moles - x / 16.6L

PCl₃: 0.8806 moles + x / 16.6L

Cl₂: 0.8806 moles + x / 16.6L

Where X is reaction coordinate.

Replacing in K formula:

0.0452 = [0.05305 + X/16.6] [0.05305 + X/16.6] / [0.13953 - X/16.6]

6.3068x10⁻³ - 2.723x10⁻³ X = 0.0028143 + 0.00639157 X + 0.00362897 X²

0 = -0.0034925 + 0.00911457X + 0.00362897 X²

Solving for X:

X = -2.8 → False answer. There is no negative concentrations

X = 0.3378 moles

Replacing:

PCl₅: 2.3162 moles - 0.3378 / 16.6L = 0.1192M

PCl₃: 0.8806 moles + 0.3378 / 16.6L = 0.0734M

Cl₂: 0.8806 moles + 0.3378 / 16.6L = 0.0734M

Beeing these concentrations the concentrations in equilibrium of the three gases

The question requires us to identify the type nuclear decay that releases a photon of light energy and does not change the atom's mass or atomic number.

As we are talking about a nuclear decay that doesn't provoke a change in the atom's mass or atomic number, we can rule out both alpha and beta decay. Remember that an alpha particle contains two protons and two neutros, therefore an alpha decay changes both mass and atomic number. Similarly, the emission of an beta particle also changes the atomic number.

Then, we can analyze the remaining options: gamma decay and electron capture decay.

Electron capture decay is i process in which a proton-rich nucleus of an electrically neutral atom absorbs an inner atomic electron, causing the change of a proton to neutron and causes the emission of a neutrino.

Gamma decay, on the other side, an atomic nucleus changes from a higher energy-state to a lower energy-state through the emission of electromagnetic radiation (a photon). Since it doesn't occur the emission of a particle, there is no change to the number of protons or neutrons and the atom's mass and atomic number remains unchanged.

Therefore, the best option would be letter A, "Gamma decay".

Answer:

To determine the change in mass of A over the given time period, we need to find the difference between the initial mass of A and the final mass of A.

From the given table, we can see that the initial mass of A at t = 0 (start time) is 12.4 g and the final mass of A at t = 60 minutes (end time) is 6.2 g.

Therefore, the change in mass of A over 60 minutes is:

Final mass of A - Initial mass of A

= 6.2 g - 12.4 g

= -6.2 g

The negative sign indicates that the mass of A decreased over time, which means that A underwent some kind of reaction or process that caused it to lose mass.

The change in mass of A over 60 minutes is -6.2 grams.

To determine the change in mass of A over 60 minutes, we need to compare the initial mass to the final mass.

From the given information, we can see that the mass of A decreases over time.

Let's calculate the change in mass.

Initial Mass of A: 12.4 g

Final Mass of A: 6.2 g

Change in Mass of A = Final Mass of A - Initial Mass of A

= 6.2 g - 12.4 g

= -6.2 g

The change in mass of A over 60 minutes is -6.2 grams.

Note that the negative sign indicates a decrease in mass.

For such more questions on mass

https://brainly.com/question/1838164

#SPJ8