Given the following chemical rxn for potassium chloride mixed with sodium hydroxide:
0.25 mol KCl is mixed with 0.25 mol NaOH in a calorimeter, the temperature of
3.33 x 102 g of the solution increases from 27.0°C to 35.5°C. The specific heat of the solution
(water) is 1.00 cal/g°C.
Calculate the quantity of energy (Q= ms x AT, x SH,) evolved in the reaction:

9(A).- AT, =
(show your calculations, print neatly)
9(B).-Q=
(show your calculations, print neatly)

+571.6 KJ and 1803.03 J/K are  the entropy (S) of system and the change of S of surrounding.

2H2O(l) --->2H2(g) + O2(g)

first step is to get dHrxn = dHf(Products) - dHf(reactants)

take dHf of reactants and products from standard thermodynamic table

dHf(H2O) = -285.8 KJ/mol

dHf(H2) =0 kj/mol

dHf(O2)= 0 kj/mol

dHrxn = 2dHf(H2) + dHf(O2) - 2dHf(H2O)

  = 2*0 + 0 - 2 [-285.8] kj =  +571.6 KJ

this is for 2 mole of H2O

for 1.88 mols H2O, dHrxn =  +571.6 KJ/2mol×1.88 mol = 537.304 kj

T =298 K

dS surrounding = - dHrxn/T = -537304 j/298 K = -1803.03 J/K

Entropy is the measurement of the amount of thermal energy per unit of temperature in a system that cannot be used for productive labor. Entropy is a measure of a system's molecular disorder or unpredictability since work is produced by organized molecular motion.

In an isolated system—one that does not exchange heat or work with its surroundings—spontaneous change for an irreversible process always moves in the direction of rising entropy, according to the Clausius form of the second law. For instance, the ice block and the stove are two components of a standalone system for which the overall entropy rises as the ice melts.

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It is the simplest whole number ratio of elements in a compound. Molecular formula is n times the empirical formula where n is integers 1,2,... The empirical formula is BH2N.

Empirical formula gives the proportion of the element that is present in a compound. It does not give information about the actual number or the arrangements of the atoms.

n= molecular formula÷ empirical formula

Molecular formula =B[tex]_3[/tex]H[tex]_6[/tex]N[tex]_3[/tex]

Molecular formula = 3×BH2N

Molecular formula =3×empirical formula

Empirical formula = BH2N

Therefore, the empirical formula for this compound B[tex]_3[/tex]H[tex]_6[/tex]N[tex]_3[/tex] is BH2N.

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It takes a sample of CO₂ 23.3 seconds escape from a container. it will take the same volume of NO₂(g) to escape from the same container is 23.4 sec.

The effusion rate gas is inversely proportional to the square root of molecular mass.

Rate ∝ √1/M

for the same volume of gases,

t1 / t2 = √ M1 / M2

molar mass of  CO₂ = 44 g/mol

molar mas of  NO₂ = 46 g/mol

23.3 / t2 = √ 44 / 46

23.3 / t2 = 6.6 / 6.7

23.3 / t2 = 0.9

t2 = 23.4 sec

Thus, It takes a sample of CO₂ 23.3 seconds escape from a container. it will take the same volume of NO₂(g) to escape from the same container is 23.4 sec.

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The molarity of the acid is the 64.3dm³

Molarity is the amount of a substance in a certain volume of solution

Here given data is

25 cm³ of a solution of 0.1 mol dm-³ NaOH reacts with 51.5 cm³ of a solution of hydrochloric acid

We have to calculate molarity = ?

So the molarity = number of moles of solute/volume of solution in L or dm³

1. 25 cm³ = 1.25ml = volume

Molarity =  51.5 cm³ × 1.25ml

Molarity = 64.3dm³

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The value of hydroxide ion concentration, [OH⁻] in the table, given that [H₃O⁺] is 2.0×10⁻⁶ M, is 5.0×10⁻⁹ M

From the defininion of pH, we understood that the relationship between hydronium ion, H₃O⁺ and hydroxide ion, OH⁻ in a solution is given as:

[H₃O⁺] × [OH⁻] = 10¯¹⁴

With the above formula, we can determine the value of the hydroxide ion, OH⁻. Details below:

[H₃O⁺] × [OH⁻] = 10¯¹⁴

2.0×10⁻⁶ × [OH⁻] = 10¯¹⁴

Divide both side by 2.0×10⁻⁶

[OH⁻] = 10¯¹⁴ / 2.0×10⁻⁶

[OH⁻] = 5.0×10⁻⁹ M

Thus, we can conclude that the hydroxide ion concentration, [OH⁻] is 5.0×10⁻⁹ M

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If Huda sees an obvious set of fingerprints on a mirror at a crime scene, the way in which she could best preserve this evidence is to: C. use clear tape to lift the prints.

In English language, an evidence can be defined as a collection of factual information that comprises empirical statistics and analysis, which are typically used to show or prove that an action, event, message, etc., is credible, reliable, truthful, and verified.

In Forensics, there are different types of evidence that are used in combatting crimes and these include the following:

Additionally, it is very important and essential that forensic experts and scientist preserve any evidence that is seen or obtained from a crime scene, especially by choosing the most efficient and effective technique (method) such as using a clear tape to lift set of fingerprints on a mirror.

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Answer: C

Explanation:

The ratio of the carbon to the rest of the atoms in the compound would be 2.49375 to 3.9901 of hydrogen, and 1.00 of oxygen.

The ratio of an atom to the rest of the atoms in a compound can be determined by knowing the empirical or molecular formula of the compound.

Now, the compound in question contains C, H, and O.

Let's divide the mol f each atom by the mol of the smallest. the smallest in this case is 2.00 moles.

C = 4.9875/2.00 = 2.49375

H = 7.9802/2.00 = 3.9901

O = 2.00/2.00 = 1.00

Thus, the ratio for carbon is 2.49375 to 3.9901 of hydrogen, and 1.00 of oxygen.

The empirical formula of the compound is [tex]C_2H_4 O[/tex].

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The ratio of C if 4.9875 mol C, 7.9802 mol H, and 2.00 mol O are present in the sample is 2.5.

Empirical formula is a notation indicating the ratios of the various elements present in a compound, without regard to the actual numbers.

The empirical ratio to derive the empirical formula can be calculated by dividing the number of moles of each element by the smallest value.

According to this question, there are 4.9875 mol C, 7.9802 mol H, and 2.00 mol O in the sample. The smallest mole is 2 moles.

Therefore, the empirical ratio of carbon in the compound is 2.5.

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2520 joule is the heat (q) when a student dissolves 5.00 g of CaCl₂ into 200.0 g of H₂O. The temperature changes from 25.0°C to 28.0°C.

H₂O mass=200.0 g

c of H₂O= 4.2 joules per gram

Δt=3 °C

q=mcΔt

q=200.0 g×4.2×3

q=2520 joule

mass of solution= (solute + solute)

mass of solution=5.00 g+200.0 g

mass of solution=700 g

Heat has a very precise meaning in thermodynamics that is distinct from how we typically use the word. Heat is the thermal energy that is transmitted when two systems with different surface temperatures come into contact. Heat is denoted by the letters q or Q and is measured in Joules.

Because it is defined in the context of a process through which energy can be transmitted, heat is occasionally referred to as a process quantity. We don't discuss the heat that a cup of coffee contains, but we may discuss the heat that the cup of hot coffee transfers to your hand. Another significant characteristic is heat.

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answer : 2.02 J/g°C

Answer:

Below

Explanation:

specific heat cap =  j / (gm c)

                = 47.5 / (13.2 *1.72) = 2.09   j / (gm-c)   or   = 2093 j/(kg-C)

Heat capacity  =  47.5 / 1.72 = 27.6 J / C

There are 5 oxygen atoms in one nitrogen pentoxide. The number of oxygen atoms in one mole of nitrogen pentoxide is 3.01 × 10²⁴.

Any  substance containing 6.022 × 10²³ atoms is called one mole of the substance. This number is called Avogadro number. Hence, one mole of every element contains Avogadro number of its atoms.

One mole oxygen contains 6.022 × 10²³ oxygen atoms. Similarly one mole of a compound contains 6.022 × 10²³  number of its constituent molecules.

Now, the number of oxygen atoms in one mole of N₂O₅ will be 6.022 × 10²³ × 5 = 3.01 × 10²⁴. Therefore, option b is correct.

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Mole measure the number of elementary entities of a given substance that are present in a given sample. 6.02 x 10²³ oxygen atoms are

present in one mole of dinitrogen pentoxide N[tex]_2[/tex]O[tex]_5[/tex]. The correct option is option 4.

The SI unit of amount of substance in chemistry is mole. The mole is used to measure the quantity of amount of substance.

One mole of any substance contains  6.02 x 10²³ number of  atoms. 6.02 x 10²³ is called Avogadro number. Mole is inversely proportional to Avogadro number.

Therefore,  6.02 x 10²³ oxygen atoms are present in one mole of dinitrogen pentoxide. The correct option is option 4.

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The pressure of 8.06 L of an ideal gas in a flexible container is decreased to one-third of its original pressure, and its absolute temperature is decreased by one-half and the final volume of gas is 12.09 L

The volume of gas in a flexible container is 8.06 L

The pressure is P1=X atm

Temperature is T1=YK

Let us calculate the volume V2 if Pressure P2=X/3 atm

Temperature T2=Y/2 K

Using the ideal gas equation, we get

P1V1/T1=P2V2/T2

V2=V1P1T2/T1P2

V2=8.06LX atm×Y/2K/YK.X/3 atm

V2=8.06x3/2

V2=12.09 L

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We cannot predict whether a spatial object is a star or a planet based on just its mass. However, Jupiter is already proven to be a planet which revolves around the sun. Thus we can't agree to the statement.

Stars are spatial things with light energy formed by gases and dust particles. They are stationary at a position in the universe. They can form groups with other stars called constellations in various shapes which are connected by the force of attraction.

Planets are revolving around a star such as in solar system, where, 8 planets including earth and Jupiter. Jupiter is the biggest planet in the solar system and it is not star.

Therefore, Jupiter is not a star and the statement is false.

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The new volume of a gas 40ml, if 50 mL at 81.0 kPa has its pressure increased to 101.3 kPa.

What is Boyle's Law?

Boyle's law is a gas law that states that the pressure exerted by a gas (with a given mass and constant temperature) is inversely proportional to its volume. In other words, as long as the temperature and amount of gas remain constant, the pressure and volume of a gas are inversely proportional to each other. Boyle's law was proposed in 1662 by the Anglo-Irish chemist Robert Boyle.

Any change in the volume occupied by a gas (at constant quantity and temperature) results in a change in the pressure exerted by it, according to Boyle's law.

In other words, the product of a gas's beginning pressure and volume is equal to the product of its end pressure and volume (at constant temperature and number of moles).

P1V1 = P2V2

Where,

P1 denotes the gas's initial pressure.

V1 denotes the gas's initial volume.

P2 denotes the gas's final pressure.

V2 denotes the gas's final volume.

The pressure-volume relationship provided by Boyle's law can be used to get this phrase. PV = k for a fixed amount of gas kept at a constant temperature. Therefore,

P1V1 = k (starting pressure * starting volume)

P2V2 = k (last pressure * last volume)

∴ P1V1 = P2V2

According to Boyle's Law

p1v1=p2v2

81x50= 101.3xv2

v2 = 140ml

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The pressure that must be applied to increase the dentisy by 0.10% is 453.48 atm.

It's important to note that isothermal compressibility simply means the fractional differential change that can be seen in the volume as a result if the change in pressure.

It should be noted that the isothermal compressibility formula will be:

= 1/v (dv/dp)

where v = volume

p = pressure

dv = 0.10% = 0.001

This will be:

2.21 × 10^(-6) = 0.001/dp

dp = 0.001 / 2.21 × 10^(-6)

dp = 452.48 atm

New pressure = 1 atm + 452.48 atm

= 453.48 atm

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Complete question

The isothermal compressibility of lead at 293 K. Calculate the pressure that must be applied to increase the dentisy by 0.10%.

The mass of antimony present in the sample is 1.65 g

The percentage mass of antimony in the sample is 20.7%.

The number of moles of antimony present in the sample is determined from the mole ratio of the reaction.

The mole ratio of the reaction is obtained from the balanced equation of the reaction as follows:

Balanced equation of the reaction:

BrO₃⁻ (aq) + 3 Sb³⁺ (aq) + 6 H⁺ ⟶ Br⁻ (aq) + 3 Sb⁵⁺ + 3 H₂O

moles of KBrO₃ in the 34.8 mL of a 0.130 M aqueous solution of KBrO₃ is determined as follows:

Moles of KBrO₃ = 0.13 * 34.8/1000

Moles of KBrO₃ = 0.004524 moles

1 mole of  KBrO₃ reacts with 3 moles of Sb³⁺

Moles of Sb³⁺ reacted = 0.004524 * 3

Moles of Sb³⁺ reacted = 0.13572 moles

The mass of antimony present = moles * molar mass

Molar mass of antimony = 121.76 g/mol

Mass of antimony = 121.76 * 0.13572

Mass of antimony = 1.65 g

Percentage mass of antimony = (1.65/7.97) * 100%

Percentage mass of antimony = 20.7%

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5 ×10^-10 equilibrium constants indicates the reaction that  gives the greatest amount of reactant.

At equilibrium, the forward and reverse reaction rates are equal, resulting in constant concentrations for all of the chemicals. Given that, it seems sense that the ratio of concentration for any given reaction at equilibrium will always keep a constant value.

The ratio of the mathematical product of a reaction's products to that of the concentrations of its reactants is known as the equilibrium constant (Keq). The balanced chemical equation raises each concentration to the power of its corresponding coefficient. K=1 when equilibrium attains. It has no units.

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If a certain piece of metal is cooled it will conduct current better is a hypothesis.

When a conductor is connected to a fluctuating magnetic flux, it induces closed loops of electric currents known as eddy currents. They create closed circuits in a plane perpendicular to the magnetic field and are subject to Faraday's law of electromagnetic induction. These currents will flow in a direction that opposes the shift required by the Lenz law.

Eddy currents are created when a conductor is traveling through a magnetic field or when the magnetic field around a conductor at rest changes over time. They arise from variations in the strength and direction of a conductor-linked magnetic field or magnetic flux.

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Answer:

1.468 M

Explanation:

The speed that reflects the average kinetic energy of the molecules is known as the root-mean-square speed. using N2 at 25 °C.

The square root of temperature and the square root of the molar mass are both exactly proportional to the rms velocity. Thus, doubling the rms velocity of the molecules when the temperature of a specific gas is quadrupled.

The root mean square velocity of gaseous hydrogen molecules equals that of oxygen molecules at 47°C at what temperature.

A gas will effuse more quickly the lighter it is; conversely, the heavier a gas is ,the slower it flows, the more. Helium (He) will have the highest rate of effusion since it has the lowest molecular weight (atomic weight, in this example).

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The amount of the concentrated solution and water needed would be 154.5 mL and 345.5 mL respectively.

The problem here can be solved using the simple dilution equation that is expressed as:

[tex]m_1v_1[/tex] = [tex]m_2v_2[/tex]

Where [tex]m_1[/tex] is the molarity of the undiluted solution, [tex]v_1[/tex] is the volume of the underlined solution needed, [tex]m_2[/tex] is the molarity of the solution to be prepared, and [tex]v_2[/tex] is the volume of the solution to be prepared.

In this case:

[tex]m_1[/tex] = 0.7280 M

[tex]v_1[/tex] = ?

[tex]m_2[/tex] = 0.2250

[tex]v_2[/tex] = 500.0 mL

Rearranging the equation to make [tex]v_1[/tex] the subject:

[tex]v_1[/tex] = [tex]m_2v_2/m_1[/tex]

Now, let's substitute the values:

[tex]v_1[/tex] = 0.2250 x 500.0/0.7280

    = 154.5 mL

This means the volume of the concentrated solution needed is 154.5 mL out of 257.4 mL available. Since our final volume is 500.0 mL, the 154.5 mL stock solution will be made up to 500 mL with water.

Thus, the amount of water required would be:

500.0 - 154.5

  = 345.5 mL

In other words, the volume of the concentrated solution needed is 154.5 while the volume of water needed is 345.5 mL.

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The complete question: If you have 257.4 mL of a 0.7280 M potassium carbonate solution and you need 500.0 mL of a 0.2250 M potassium carbonate solution, how much concentrated solution and how much distilled water do you need?

A gas evolved during a chemical reaction and has a volume of 651 mL at 38 °C and 869 torr.  the volume of this gas in mL at 110 °C and 3.87 atmospheres was 238 mL.

given that :

volume V1 = 651 mL

temperature T1 = 38 °C = 38 + 273 = 311 K

pressure P1  = 869 torr = 1.14 atm

pressure P2 = 3.87 atm

temperature T2 = 110 °C = 110 + 273 = 383 K

volume V2 ?

using ideal gas equation , we get :

P1 V1 / T1 = P2 V2 / T2

(1.14 × 651 ) / 311 = (3.87 × V2 ) / 383

2.38 = 0.010 V2

V2 = 238 mL

Thus, A gas evolved during a chemical reaction and has a volume of 651 mL at 38 °C and 869 torr.  the volume of this gas in mL at 110 °C and 3.87 atmospheres was 238 mL.

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As a pathologist, Joachim is responsible for performing autopsies which means that he will most likely be involved in dissecting human bodies to determine how someone died and is denoted as option C.

This is referred to as a surgical procedure which involves the thorough examination of a dead body by dissection to determine the cause and manner of death so as to know next line of action.

As a pathologist, the bodies have to be cut open and carefully analyzed so as to ensure that the cause of death is determined and also helps to solve crime cases during investigations.

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The most reactive alien metal are:  bazinga (Bz) , minajine (Mdj) , madmenium (Mlr) and Dancingstar (Ds).

When newly prepared, polished, or shattered, a metal exhibits a shiny look and quite good electrical and thermal conductivity. Typically, metals are malleable and ductile. The metallic link formed by the atoms or molecules of the metal gives rise to these characteristics.

Therefore, Ernst (E), highho (Hi), terriblum (T), and sississ are the metalloids (Ss). Sississ has the largest atomic mass of any metalloid. Ernst has the lowest atomic mass of any metalloid. Group 14 includes Highho and Terriblum.

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A weak base equilibrium as shown in the equation below.  the effect on Kb if  BH⁺ were added to the solution; the equilibrium constants  is remains unchanged.

The equation is given as :

B (aq) + H2O (l) ⇌ BH⁺ (aq) + OH⁻ (aq)

K = [ BH⁺ ] [ OH⁻] / [B]

the equilibrium constant  for the given reaction is remain unchanged. the equilibrium constant will only depends on the temperature of the reaction.

Thus, A weak base equilibrium as shown in the equation below.  the effect on Kb if  BH⁺ were added to the solution; the equilibrium constants  is remains unchanged.

B (aq) + H2O (l) ⇌ BH⁺ (aq) + OH⁻ (aq)

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The volume of toluene had been collected is 79.8L

Steam distillation is a process used for the recovery of volatile compounds with high boiling points and from inert and complex matrices solid and liquid using saturated or superheated steam as separation and energy agent

Here a student performed a steam distillation of toluene and water

So we have to calculate the volume of toluene = ?

So density = mass/volume

Rearranging the formula

Volume = mass × density

So mass of toluene = 92.14g/mol

Density of toulene = 867kg/m³

So Volume = mass × density

Volume = 92.14g/mol×867kg/m³

Volume = 79.8L

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The ground state electron configuration for the monoatomic ion is 1s2 2s2 2p6 3s2 3p6 4s2 3d10 4p6.

A monoatomic ion is an ion that contains only one atom. We can be able to form an ion by the addition or by the removal of an electron from the atom. We form a positive ion by the removal of an electron and we form a negative ion by the addition of an electron.

Now we have the element that is called selenium (Se) the ion that is formed by this element is Se^2-. Selenium is able to form a monoatomic ion when it gains two electrons. The electron configuration of this ion is; 1s2 2s2 2p6 3s2 3p6 4s2 3d10 4p6.

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This reaction is exothermic reaction and the q value is -484 kJ

An exothermic reaction is a chemical reaction that involves the release of energy in the form of heat or light

Here given reaction is

2H2(g) + O2(g) → 2H₂O(g)

In this reaction we can see that heat is released so if heat is released after completion of the reaction such reaction are called as exothermic reaction and thus given reaction is exothermic reaction

The fuel is hydrogen it react with oxygen from the air this is an exothermic reaction

So because of exothermic reaction ΔH = -ve

That why the q value is also negative so it is q = -484 kJ

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The formula to find the mass in grams is =  number of moles × Molecular mass

A mole is defined as 6.02214076 × 1023 of the chemical unit, be it atoms, molecules, ions, or others as well. The mole is a convenient unit to use because of the great number of atoms, molecules, or others that are present in any substance.

To find number of moles we use the formula that is weight divided by molecular mass

From this we can find out the mass as well;

Mass = Number of moles × Molecular mass

Mass = 3.6 × 98.070 ⇒ 353.08 grams

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Answer:

0.11 m

Explanation:

H Ci + NaOH H2 O+ NaC1

by titration

0.0025 L of 0.13 mol Na OH = 0.00325 Mol NaOH

L

0.00325 Mol NaOH 1 Mol Hcl/I Mol NaOH = 0.00325 Mol hcl

now 0.00325 mol Hcl/ 0.030 L = 0.0108 M hcl