Please help, I’ll mark your answer as brainliest.

The standard enthalpy change for the reaction 2A + B ⇌ 2C + 2D   is 195 kJ/mol.

The enthalpy of a reaction is a measure of the heat changes that occur when reactants form a product in a given reaction.

The enthalpy change of a reaction can be calculated using the formula given below:

Enthalpy of reaction = sum of enthalpies of the products  - sum of enthalpies of the reactants

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

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

Enthalpy of reaction = {[2 * 177 + 2 * (-515)] - [2 * (-231) + (-409)]}

Enthalpy of reaction = 195 kJ/mol

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The final temperature of the sample of nitrogen dioxide gas that occupies 625 cm³ at 70.0 °C and 15.0 psi is 299.12K.

The temperature of a gas can be calculated by using the combined gas law formula as follows:

P₁V₁/T₁ = P₂V₂/T₂

Where;

According to this question, a sample of nitrogen dioxide gas occupies 625cm³ at 70.0 °C and 15.0 psi. The final temperature can be calculated as follows:

15 × 625/343 = 15 × 545/T

27.33T = 8175

T = 299.12K

Therefore, 299.12K is the final temperature of the sample of nitrogen dioxide gas.

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The wavelength is same.

What is wavelength?

Wavelength can be defined as the distance between two successive by throughs of a wave.

The question wants you to determine the energy that is the incoming photon by the  must have in order to the accept the electron that melted  it tob the jump to 2 to 1.

A good starting point here will be to calculate the energy of to the photon emitted when the electron falls from  1 to 2

by applying the Rydberg equation.

1/π = R

λ

 si the wavelength of the emittted photon R

 is the Rydberg constant, equal to 1.907.

This means that you haveλ=

4.10

So, you know that when an electron falls from the

to  

a photon of wavelength by the

410 nm

 is emitted. This implies by  that in order to the for the electron by jump to  the 2 to 1 .

 it must absorb a photon of the same wavelength.

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Answer:

A

Explanation:

Fluorine is a REACTIVE nonflammable gas or liquid which will enhance combustion of other materials.

Answer:

Explanation:

1. No, I simply would not feel safe.

2. Power plant manager

3. exposure to chemicals

The enthalpy of reaction for the formation of sulfur tetrafluoride monoxide is 16 kJ/mol.

The enthalpy of a reaction measures the sum total of the heat that is absorbed or liberated in a given reaction when reactants react to form products.

The enthalpy change of a reaction can be calculated using the formula given below:

The equation of the given reaction is as follows:

SF₄ + ¹/₂ O₂-----> SF₄O

Enthalpy of reaction = (4 * S-F + S-O) - (4 * S-F + ¹/₂ * O-O)

Enthalpy of reaction = (4 * 310 + 265) -  (4 * 310 + /₂ * 498)

Enthalpy of reaction = 16 kJ/mol

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Answer:

3 grams C₅H₁₀O₅

Explanation:

To find the mass of ribose needed to prepare the sample, you need to

(1) convert the volume from mL to L (1,000 mL = 1 L)

(2) calculate the number of moles (M = moles / L)

(3) convert moles to grams (using the molar mass of ribose)

The molecular formula of ribose is C₅H₁₀O₅. It is important to arrange all of the ratios/conversions in a way that allows for the cancellation of units.

(Step 1)

 200 mL C₅H₁₀O₅                   1 L
----------------------------  x  ----------------------  =  0.2 L C₅H₁₀O₅
                                           1,000 mL

(Step 2)

Molarity (M) = moles / volume (L)                 <----- Molarity ratio

0.1 M = moles / 0.2 L                                     <----- Insert values

0.02 = moles                                                  <----- Multiply both sides by 0.2 L

(Step 3)

Atomic Mass (C): 12.011 g/mol

Atomic Mass (H): 1.008 g/mol

Atomic Mass (O): 15.999 g/mol

Molar Mass (C₅H₁₀O₅): 5(12.011 g/mol) + 10(1.008 g/mol) + 5(15.999 g/mol) = 150.13 g/mol

 0.02 moles C₅H₁₀O₅              150.13 g
----------------------------------  x  -------------------  =  3 grams C₅H₁₀O₅
                                                  1 mole

According to the Lewis structures, SF₂ is unstable as it has 2 lone pairs of electrons.

Lewis  structures are also called as electron dot structures and can be drawn if the molecular formula of a compound is known. It provides information regarding the nature of bond and the position of atoms .

They are also capable of exhibiting the lone pair if any present in a molecule or compound.Lewis defined a base to be an electron pair donor and an acid to be an electron pair acceptor.

They are capable of reflecting electronic structure of elements and even the pairing of electrons . In the diagram, each dot represents an electron while a pair of dots represent a bond between the atoms.

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Answer:

KE=1\2mv2

KE=0.5 *0.15*(36)2

97.2j

Answer:

a

Explanation:

bc i think it is and pls i wany to have ajebehhe

Answer:

if it burns

Explanation:

The temperature change of the resulting solution, given that the soluton has a specific heat of 1 cal/g·°C is 18.7 °C

We know that heat released is related to change in temperature according to the following formula:

Q = MCΔT

Where

Using the above formula, the temperature change of the solution can be obtained as follow:

Q = MCΔT

-8.8×10² = 47 × 1 × ΔT

-8.8×10² = 47 × ΔT

Divide both side by 47

ΔT = -8.8×10² / 47

ΔT = -18.7 °C

Thus, the temperature change is 18.7 °C

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Answer:

What is the pH of an aqueous solution with a hydrogen ion concentration of [H+]=7.7×10−4 M?

The pH of an aqueous solution with a hydrogen ion concentration of [H+]=7.7×10−4 M is 3.11.

[tex]{ \blue{ \sf{Albumin}}}[/tex] is a soluble and globular monomeric protein encoded by chromosome 4 that comprises about half of the protein found in blood serum. It functions as a carrier protein for steroids, fatty acids, and thyroid hormones as well as stabilizing extracellular fluid volume.

The mass of [tex]CO_2[/tex] that will be produced when 25.0 g of [tex]C_8H_{18[/tex] reacts completely in the equation would be 154.035 g.

From the balanced equation of the reaction which goes thus:

[tex]C_8H_{18} + 25 O_2 -- > 16 CO_2 + 18 H_2O[/tex]

The mole ratio of [tex]C_8H_{18[/tex] that reacts and the [tex]CO_2[/tex] that is produced is 1:16.

Recall that: mole = mass/molar mass

The molar mass of [tex]C_8H_{18[/tex] is 114.23 g/mol

Mole of 25.0 g  [tex]C_8H_{18[/tex] = 25/114.23

                                     = 0.22 mol

Since the mole ratio is 1:16, the moles of [tex]CO_2[/tex] that will be produced by 0.22 mol of [tex]C_8H_{18[/tex] would be:

0.22 x 16 = 3.50 mol

The molar mass of [tex]CO_2[/tex] is 44.01 g/mol, thus, the mass of 3.50 mol of the gas can be determined as:

Mass = mole x molar mass

         = 3.5 x 44.01

         = 154.035 g

In other words, the mass of [tex]CO_2[/tex] that will be produced when 25.0 g of [tex]C_8H_{18[/tex] reacts completely in the equation would be 154.035 g.

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To solve such this we must know the concept of displacement reaction. Therefore, the correct option is option C that is displacement reaction.

Chemical reaction is a process in which two or more than two molecules collide in right orientation and energy to form a new chemical compound. The mass of the overall reaction should be conserved. There are so many types of chemical reaction reaction like combination reaction, double displacement reaction.

when zinc reacts with copper oxide then zinc displace copper from copper oxide as zinc is more reactive than copper on the reactivity series. So, copper is displaced by zinc.

Therefore, the correct option is option C that is displacement reaction.

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As you can see the picture, in the three given compounds i.e. ethane, ethene and ethyne, ethyne have shortest bond. Bond length of ethyne is very short when compared to the ethane and ethene. Shorter the bond, bond strength will be more. Hence, our answer is ethyne.

Answer:

ethyne has shortest bond

According to stoichiometry and balanced chemical equation  10 moles of lithium metal react to yield 5.00 mole of hydrogen gas.

Stoichiometry is the determination of proportions of elements or compounds in a chemical reaction. The related relations are based on law of conservation of mass and law of combining weights and volumes.

Stoichiometry is used in quantitative analysis for measuring concentrations of substances present in the sample.

In the  balanced chemical equation as 2 moles of lithium produce 1 mole of hydrogen.

∴for 5 moles of hydrogen to be liberated,5×2/1=10 moles of lithium are required.

Thus, 10 moles of lithium are required to react to yield 5 moles of hydrogen gas.

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The net force on the man is 10 newtons forward. The parachute is pushing the man forward with 10 newtons of force. Therefore, option A is correct.

The vector sum of the forces exerted on a particle or object is known as the net force. The original forces' impact on the motion of the particle is replaced by the net force, which is a single force.

In accordance with Newton's second rule of motion, it causes the particle to accelerate at a rate equal to the sum of all those actual forces.

The vector sum of all forces exerted on an object is known as the net force. The net force acting on an object is zero when it is in equilibrium, whether it is at rest or moving at a constant speed. Only when all of a vector's components are zero can a vector have a magnitude of zero.

Thus, option A is correct.

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Answer: A

Explanation:

Average kinetic energy is the average sum of all kinetic energy of all the molecules of gases. Therefore, the new kinetic energy is 48 times the original kinetic energy.

It is a energy which is possess  by a moving object. It is very difficult to find the correct value of kinetic energy so we find average kinetic energy. Which is very easy to calculate as compared to calculating kinetic energy

Average kinetic energy is directly proportional to temperature. It is not dependent on the type of gases or mass of gases

Mathematically,

K.E=2/3KT

Where,

K= Boltzmann constant

T is the temperature

Gases at higher temperature will have higher average kinetic energy. For every 10 degree rise in temperature, kinetic energy of reaction gets double. There are 24 times 10 between the given temperature  -49C to 287C. So, the new kinetic energy is 48 times the original kinetic energy.

Therefore, the new kinetic energy is 48 times the original kinetic energy.

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Answer:

an inference is an educated answer based on a piece of information you have been given

Explanation:

e.g. they had pigtails in their long blonde hair.

from this we can infer that I am speaking about a girl

Answer:The pressure exerted by the gas is 100kPa

Explanation:Let's apply the Charles Gay Lussac law, to solve the question.

At constant volume, the pressure varies proportionally with the temperature.

P initial / T° initial = P final / T° final

50kPa / 20°C = P final / 40°C

Temperature has increased the double, so the pressure will be increased, the double too.

100 kPa

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Answer:

GL

Explanation:

Answer:

ethyl ethanoate

Explanation:

it helps you

sorry it's not clear anyway hope you can see the H and C .. the hydrogen atoms are 8

Answer:

Molar mass of dye = 225.8 g/mol

Mass of dye = 17.26 mg

Volume of stock solution = 500.0 mL

Concentration of dye (M) = (17.26 mg/225.8 g/mol) / (500.0 mL/1000 L) = 0.000769 M

Concentration of dye (mM) = 0.769 mM

According to the molar concentration, the concentration of the dye in the stock solution is 15.04×10⁻³M and 15.04×10⁻⁶mM.

Molar concentration is defined as a measure by which concentration of chemical substances present in a solution are determined. It is defined in particular reference to solute concentration in a solution . Most commonly used unit for molar concentration is moles/liter.

The molar concentration depends on change in volume of the solution which is mainly due to thermal expansion. Molar concentration is calculated by the formula, molar concentration=mass/ molar mass ×1/volume of solution in liters.

In terms of moles, it's formula is given as molar concentration= number of moles /volume of solution in liters.

Substitution of values in formula gives, M= 0.017/225.8×1/0.5=15.04×10⁻³ M or 15.04×10⁻⁶ mM.

Thus, the concentration of the dye in the stock solution is 15.04×10⁻³M and 15.04×10⁻⁶mM.

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To solve this type of question we must know the concept of rate law for first order kinetics and first law related to this. Therefore, the half-life of the given compound is 12.8hr.

There are two kinds of rate law in chemical kinetics one is differential rate law and other is integrated rate law.

The expression for half life for first order reaction is

[tex]t_{1/2} = \frac{0.693}{K}[/tex]

k= rate constant= 5.40×10⁻²/hr

Substituting all the given values in the above equation, we get

[tex]t_{1/2} = \frac{0.693}{ 5.40 *10^{-2}}[/tex]

On solving this, we get

half life =0.128×10²=12.8hr

Therefore, the half-life of the given compound is 12.8hr.

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As per the standard data, the heat evolved during one mole of calcium carbonate decomposes is 177.8 KJ. Thus 15 g or 0.15 moles of calcium carbonate when decomposed will produce 26.67 KJ of heat.

Reaction enthalpy of a substance is the heat evolved or absorbed during a reaction. Reaction enthalpy is negative for an exothermic reaction and positive for an endothermic reaction.

Molar mass of calcium carbonate = 100 g.

no.of moles in 15 g = 15 /100 = 0.15 moles.

One mole or 100 g of calcium carbonate decompose to evolve 177.8 KJ according to the scientific record.

Thus, heat evolved by the decomposition of 0.15 moles is 0.15 × 177.8 KJ = 26.67 KJ.

Hence, the heat evolved during the decomposition of 15 g of calcium carbonate is 26.67 KJ.

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Answer:

H/Hydrogen atoms = 12

reason:

no. of carbon=5

so it'll be C5H12

The partial pressure of oxygen is the product of its mole fraction and the total pressure. Partial pressure of O₂ here, is 0.82 atm.

Partial pressure of an individual gas in a mixture of gases is its contribution to the total pressure of the gas mixture. According to Dalton's law of partial pressures, the total pressure of the mixture is the sum of partial pressures of the individual gases.

The partial pressure of the individual gases will be the product of the mole fraction and total pressure.

mass of oxygen = 16 g/mol

number of moles in 50 g = 50 /16 = 3.125 moles.

mass of neon = 20 g/mol

moles in 50 g =  50 / 20 = 2.5 moles.

Mole fraction of oxygen =  3.125/ (3.125 + 2.5) = 0.55.

Partial pressure = mole fraction × total pressure

                           = 0.55 × 1.50 atm = 0.82 atm.

Therefore, the partial pressure of O₂ in the mixture is 0.82 atm.

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