The rate constant for the decomposition of reactant a is 0. 0092 s-1. How long will it take for 80% of the reactant to decompose? please answer in seconds and round your answer to one decimal place.

Answer:

No.of copper atoms= no.of moles x No x atomicity

(No - avagardro's number )

= wt / atomic mass x No x 1

= 198 x 10 ^3 g / 63.5 x No

= 3.118 x 10^3 x 6.02 x 10^23

= 18.77 x 10^26 atoms.

Answer: See below

Explanation:

\(\mathrm{At \ constant \ pressure \ the \ heat \ generated \ and \ change \ in \ enthalpy \ are \ equal:} \\\begin{aligned}Q &=\Delta H=n C_{p} \Delta T \\&=2 \times(37.11)(277-250) \\&=2003.94 \mathrm{~J} \\Q &=\Delta H=2.0 \times 10^{3} \mathrm{~J}\end{aligned}\)

\(\mathrm{Calculate \ the \ change \ in \ internal \ energy:} \\$$\begin{aligned}\Delta H &=\Delta U+\Delta(P V) \\\Delta U &=\Delta H-n R \Delta T \\&=(2003.94)-(2 \times 8.314 \times(277-250)) \\&=(2003.94)-(448.96) \\\Delta U &=1554.98 \mathrm{~J}\end{aligned}\)

Answer:

Molarity = 1.12 mol/L

Explanation:

To make an aqueous solution of Na₂O, the concentration will be calculated by: concentration (c) (or molarity) = number of moles present (n) ÷ volume needed (V) (in litres)

since we don't have moles, we can calculate moles by:

number of moles (n) = mass present (m) (in grams) ÷ molar mass (M) (in grams per mole), which we can find using a standard IUPAC Periodic Table

∴ n(Na₂O) = m/M = 34.8/(22.99×2+16.00) = 0.56147 mol

Now we have the number of moles present, we can calculate concentration:

∴ c(Na₂O) = n/V = 0.56147/0.50L = 1.12 mol/L

sodium and chlorine Because Sodium and chlorine make Salt which are ionic compound.

The response to the question is that the polymer's molar mass is (7.99 × 10^-3 g/torr-L)

Avogadro's quantity (6.022 x 1023) of atoms or formula units make up one mole of a substance. The volume of mole of a substance of a chemical is indicated by its molar mass.

The Van 't Hoff method may be used to get the polymer's molarity from its osmotic pressure: = iRT/V.

where P is the gas constant, I the van 't Hock factor (number of nanoparticles per molecule), R the osmotic, T the temp in Kelvin, and V the volume a mole of solute occupies.

By rewriting the equation and inserting therefore first, one may get the molar mass (M):

Substituting the given values:

M = (i)(0.0821 Latm/molK)(303 K)/(26.9 torr)(0.251 L) =

7.99 × 10^-3 g/torr-L

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This problem is providing the equilibrium reaction whereby SO3 is produced and asks for the value of the equilibrium constant. After the calculations, the answer turns out to be 0.124.

In chemistry, when a chemical reaction attempts to go to completion, it might experience a limitation known as equilibrium; a condition where it is not able to proceed any further.

In such a way, for the given reaction:

\(2SO_2(g)+O_2(g)\rightleftharpoons 2SO_3(g)\)

We can write the equilibrium expression as:

\(K=\frac{p_{SO_3}^2}{p_{SO_2}^2p_{O_2}}\)

Hence, given the total pressure at equilibrium, we can add the pressures of all the species at equilibrium including the reaction extent, x:

\(P_{eq}=p_{SO_3}+p_{SO_2}+p_{O_2}\\\\3.80=(2x)+(2.98-2x)+(1.18-x)\)

Thus, we solve for x to obtain:

\(3.80-2.98-1.18=2x-2x-x\\\\-0.36=-x\\\\x=0.36bar\)

Hence, we plug it in into the equilibrium expression to obtain the equilibrium constant as follows:

\(K=\frac{(2x)^2}{(2.98-2x)^2(1.18-x)}\\\\K=\frac{(2*0.36)^2}{(2.98-2*0.36)^2(1.18-0.36)}\\\\K=0.124\)

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Answer:

the teacher said she would like me 50,000 to the class on Friday night so we will have a lot to discuss with the team to make fries for a little while watching a game and a few of them just like the other car I am going for the first day and the only way to go to the game was for a little more than one hour or so to see the game in a Regents way that is not the only reason you want it was the same

Answer:

166,600J

Explanation:

Kinetic energy (K.E), which is the energy due to motion of a body, can be calculated by using the formula;

K.E = 1/2 × m × v²

Where;

K.E = kinetic energy (joules)

m = mass of body (kg)

v = speed or velocity (m/s)

According to this question, the mass of the roller coaster is 833.0 kg while its velocity/speed is 20.0m/s.

K.E = 1/2 × 833 × 20²

K.E = 1/2 × 833 × 400

K.E = 1/2 × 333200

K.E = 166,600

Therefore, the kinetic energy of the roller coaster car is 166,600J.

Materials generally become warmer when they are "absorbed" by light, this statement is more detailed. So, the correct answer is "absorbed by them."

Explanation: When a material absorbs light, it receives energy from the light, which leads to an increase in temperature. When light is absorbed by a material, the energy of the light is transformed into internal energy in the material. The temperature of a material can increase as a result of this energy absorption.

This is due to the fact that the increased internal energy of the molecules in the material causes them to vibrate more quickly and hence results in a temperature rise.

The light reflects or transmits when it passes through the material. When light reflects off a surface, it bounces back in the opposite direction. Transmitted light travels through a material without being absorbed by it.

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M = 2 . 8 . 2

Valence Electron of M = 2

M ==>  M⁺²  +  2 e⁻

a. M⁺² +  OH⁻   ==>   M(OH)₂

b. M⁺² +  PO₄⁻³  ==>  M₃(PO₄)₂

Answer:

By Convection

Explanation:

Answer:

Monkey have tail we come from monkey

Answer:

The coccyx, or tailbone, is the remnant of a lost tail. ... The coccyx serves as an attachment site for tendons, ligaments, and muscles.  Tailbones helped our ancestors with mobility and balance

Explanation:

double-replacement reaction

Answer:

4 mol MgO

Explanation:

convert the limiting reactant to product by using dimensional analysis in order to see how many moles total can be created of the product

4 mol Mg x \(\frac{2 mol MgO}{2 mol Mg}\) = 4 mol MgO

When two miscible fluids are mixed, they form a homogeneous mixture at any proportion of the component fluids.  

When two miscible fluids are mixed, they form a homogenous mixture at any ratio of the component fluids. This means that the resulting mixture is uniform throughout and the individual components cannot be easily separated. An example of miscible fluids are water and ethanol, which can be mixed together in any proportion to form a homogeneous mixture.

By contrast, substances are said to be immiscible if there are certain proportions in which the mixture does not form a solution. For one example, oil is not soluble in water, so these two solvents are immiscible. As another example, butanone (methyl ethyl ketone) is significantly soluble in water, but these two solvents are also immiscible because in some proportions the mixture will separate into two phases

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Explanation:

We have to balance the following equation:

__ H₂O + __ F₂ -------> __ HF + __ O₂

First we have to determine the number of atoms of each element that we have on both sides of the equation.

__ H₂O + __ F₂ -------> __ HF + __ O₂

O: 1 O: 2

H: 2 H: 1

F: 2 F: 1

We have 2 atoms of O on the right side and 1 atom of O on the left side. To balance the O atoms we can change the coefficient for H₂O and write a 2 in front of it.

2 H₂O + __ F₂ -------> __ HF + __ O₂

O: 2 O: 2

H: 4 H: 1

F: 2 F: 1

Then we have 4 atoms of H on the left and 1 atom of H on the right side of the equation. We can change the coefficient for HF to balance the H atoms.

2 H₂O + __ F₂ -------> 4 HF + __ O₂

O: 2 O: 2

H: 4 H: 4

F: 2 F: 4

And finally we have 2 atoms of F on the left and 4 atoms of F on the right. We can change the coefficient for F₂ and write a 2 there.

2 H₂O + 2 F₂ -------> 4 HF + __ O₂

O: 2 O: 2

H: 4 H: 4

F: 4 F: 4

The equation is balanced.

Answer: 2 H₂O + 2 F₂ -------> 4 HF + O₂

Answer:

Explanation:

In first picture,

When rock was not in the cylinder,

Volume of water

\( = {18cm}^{3} \)

In second picture,

When rock is in the cylinder,

Volume of water

\( = {36cm}^{3} \)

Hence,

Volume of rock

\( = 36 {cm}^{3} - {18cm}^{3} \)

\( = 18 {cm}^{3} (ans)\)

Explanation:

Hey there!

Your answer is: acid X having ph value 2.

The reason is when we see on an indicator, we find that different ph values of acids and bases. Generally, acids are located in left side of an indicator. 1,2,3 are most strong acid and 4,5,6 are weak acid according to the indicator's study.

So, we can derive that " X " acid is strong.

Hope it helps...

Answer: Exothermic reactions are reactions or processes that release energy, usually in the form of heat or light.

Explanation: In an exothermic reaction, energy is released because the total energy of the products is less than the total energy of the reactants.

The energy of a photon that has a frequency of 2.3 x 10¹⁴ Hz is 1.524 × 10-¹⁹J

HOW TO CALCULATE ENERGY OF A PHOTON:

E = hf

Where;

E = energy of photon (J)

h = Planck's constant (6.626 × 10-³⁴J)

f = frequency of photon (Hz)

E = 6.626 × 10-³⁴ × 2.3 × 10¹⁴

E = 15.24 × 10-³⁴+¹⁴

E = 15.24 × 10-²⁰J

E = 1.524 × 10-¹⁹J

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The heat of combustion for TNT( 3406 kJ/mole) is smaller than that of sugar (5639 kJ/mole) because TNT is an explosive material.

As sugar is a non electrolyte, it is comparatively more stable. That is why, more energy is required to decompose the sugar. Therefore, heat of combustion value is 5639kJ/mol which is high.

The heat of combustion of TNT is about 3406 kJ/mol and this value is a good indicator of the energy available from the detonation of TNT.

TNT is sometimes used as a reagent in chemical synthesis, but is best known as an explosive material with convenient handling properties.

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In a liquid H2-O2 rocket, the ratio of H2 to O2 introduced into the combustion chamber is 11,500 moles of H2 for every 5000 moles of O2 per second.

Assuming complete reaction and frozen flow in the nozzle, we need to determine the moles per second of H2, O2, and H2O exiting the rocket nozzle.

(a) To find the moles per second of each component exiting the nozzle, we need to consider the stoichiometry of the reaction. From the given ratio, for every 11,500 moles of H2, 5000 moles of O2 are present. Since the reaction is complete, all the H2 and O2 react to form H2O. Therefore, the moles per second of H2 exiting the nozzle is 11,500, the moles per second of O2 exiting the nozzle is 5000, and the moles per second of H2O exiting the nozzle is also 11,500.

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Answer:

62,790J

Explanation:

Q=mcT

= 250g*4.186J/gc*80-20

=250*4.186*60=62,790J

A chemical formula is a group of chemical symbols and numbers that express the elements and the number of atoms of each element that compose a compound.

A chemical formula of a compound offers information about the proportions of each chemical element in a given chemical compound or molecule.

The chemical formula of a compound can be written by including the chemical symbols of elements, numbers as subscripts, and symbols, such as plus (+) and minus (−) signs, dashes, commas, and brackets.

A chemical formula exhibits no words but simple chemical structures can be drawn but not full structures. Chemical formulae must be limited in power rather than chemical structural formulae.

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17.41°C is the temperature of the Ethanol increase

q=mct

t=q/mc

t=2090/50×2.43

t=17.41°C

Heat or cold are measured in terms of temperature. It may be defined in terms of a number of arbitrary scales and shows how heat energy naturally moves from a hotter to a cooler substance (one at a lower temperature). Even if a match burns at a considerably greater temperature than an iceberg, an iceberg has a lot higher overall heat energy. The energy of a thermodynamic system differs from temperature.

Temperature, along with pressure, density, and other related qualities, is referred to as an intense property—one that is independent of the amount of material being addressed—in contrast to broad characteristics like mass or volume.

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Answer:

I think, you should!

Explanation:

Thank you for your points, and please give me Brainlest!

the standard heat of combustion of propane is `-2220.1KJ mol^(-1)` .