Nitrogen monoxide is produced by combustion in an automobile engine. For the following reaction, 4.36 grams of nitrogen monoxide are mixed with excess oxygen gas . The reaction yields 5.46 grams of nitrogen dioxide . nitrogen monoxide ( g ) oxygen ( g ) nitrogen dioxide ( g ) What is the theoretical yield of nitrogen dioxide

Answer:

This is required answer.

Explanation:

Given that,

The neutralization reaction between methylamine and acetic acid

We know that,

According to proton theory of acid and base,

An acid is a substance which denotes the hydrogen as proton.

Base is a substance which accept the proton.

We need to draw curved arrows to indicate the direction of electron flow

According to diagram,

Diagram shows the movement of electrons in this step of the mechanism.

Hence, This is required answer.

Answer: 67.5

Explanation:

Brainliest pls

The SI unit to the quantity it measures are:

Mass: The mass of an object is a measure of its amount of matter. The SI unit of mass is the kilogram (kg) or gram (g).

Temperature: Temperature is a measure of the average kinetic energy of the particles in a substance. The SI unit of temperature is the kelvin (K).

Time: Time is a measure of the interval between two events. The SI unit of time is the second (s).

Electric current: Electric current is a measure of the flow of electric charge. The SI unit of electric current is the ampere (A).

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Complete question:

Drag the tiles to the correct boxes to complete the pairs. Not all tiles will be used.

Match each SI unit to the quantity it measures.

Answer:

pOH = -log[OH-]

Explanation:

Starting from the equation of [OH-], we can obtain the pOH formula clearing pOH, where 10 passes to the other side of the equation as the base of log, and then the negative sign is passed:

Answer:

\(\mathbf{ \Delta H_{rxn} = -1936 \ kJ/mol}}\)

Explanation:

The equation for the reaction is given as:

\(\mathbf{ CH_{4(g)} + 4 F_{2(g)} \to CF_{4(g)} + 4 HF_{(g) }}\)

At standard conditions; the bond energies are as follows;

Bond       Bond Energies (kJ/mol)

C-H           413

F-F            155

C-F            485

H-F            567

\(\mathbf{\Delta \ H_{rxn} = \sum \Delta H ( reactant) - \sum \Delta H (product)}\)

\(\mathbf{\Delta \ H_{rxn} = \sum [\Delta H \ 4( C-H) + \Delta H \ 4(F-F) ]- \sum[ \Delta H \ 4( C-F)+\Delta H \ 4( H-F)] (product)}\)

\(\mathbf{\Delta \ H_{rxn} = \sum{ \Delta \ H (4*413) + \Delta \ H (4*155) - \Delta \ H (4(485)) + \Delta H (4(567) }}\)

\(\mathbf{ \Delta H_{rxn} = \sum ({ (1652 + 620) - (1940 + 2268)})}\)

\(\mathbf{ \Delta H_{rxn} = \sum ({2272- 4208})}\)

\(\mathbf{ \Delta H_{rxn} = -1936 \ kJ/mol}}\)

The number of mole of CaCO₃ in antacid tablet containing 0.512 g of CaCO₃ is 5.12×10⁻³ mole

The mole of a substance is related to it's mass and molar mass according to the following equation:

Mole = mass / molar mass

From the question given above, the following data were obtained:

The number of mole in 0.512 g of CaCO₃ can be obtained as follow:

Mole = mass / molar mass

Mole of CaCO₃ = 0.512 / 100

Mole of CaCO₃ = 5.12×10⁻³ mole

Thus, 5.12×10⁻³ mole of CaCO₃ is present in the antacid tablet

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To determine the temperature of the air inside the tire when the pressure increases to 87.3 kPa, we can use the ideal gas law equation:

PV = nRT

Where:

P = pressure

V = volume

n = number of moles

R = gas constant

T = temperature

Assuming the volume of the tire remains constant, we can rearrange the equation as follows:

P₁/T₁ = P₂/T₂

Where:

P₁ = initial pressure (82.0 kPa)

T₁ = initial temperature (26.0 °C + 273.15 K) [converting Celsius to Kelvin]

P₂ = final pressure (87.3 kPa)

T₂ = final temperature (unknown)

Substituting the values into the equation:

82.0 kPa / (26.0 °C + 273.15 K) = 87.3 kPa / T₂

Now, let's solve for T₂:

T₂ = (87.3 kPa * (26.0 °C + 273.15 K)) / 82.0 kPa

Calculating the expression:

T₂ ≈ 299.19 K

To convert this temperature back to Celsius:

T₂ ≈ 299.19 K - 273.15 ≈ 26.04 °C

Therefore, the temperature of the air inside the tire, when the pressure increases to 87.3 kPa, is approximately 26.04 °C.

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Answer:

B

Explanation:

Answer:

definetly b

Explanation:

The expression of the Ksp is Ksp =  [Ca²+] [2OH-]^2

In the balanced chemical equation for the solute's dissolution, Ksp is defined as the product of the ion concentrations in a saturated solution, each concentration being raised to the power of its stoichiometric coefficient.

Ksp is temperature-dependent and varies with different compounds. It is used to predict the maximum amount of a compound that can dissolve in a given solvent under specific conditions.

We know that we can be able to use the expression that has been given in the problem to arrive at the fact that;

Ksp =  [Ca²+] [2OH-]^2

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Answer:

Electrons repel each other due to electrostatic force of attraction between both of them as a result prevent the electron from entering the nucleus preventing it from collapsing

Electrons repel each other because they have the same charge present in

them.

Law of magnetism states that:

Electrons are subatomic particles which are negatively charged which

depicts them possessing like poles.

This explains why electrons which are in contact with each other will repel as

a result of the repulsive force present in like poles.

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The temperature of the water after thermal equilibrium is obtained is 30.97 °C

From the question given above, the following data were obtained:

The equilibrium temperature can be obtained as illustrated below:

Heat loss = Heat gain

MC(T – Tₑ) = MᵥᵥC(Tₑ – Tᵥᵥ)

20 × 0.129 (500 – Tₑ) = 300 × 4.18(Tₑ – 30)

2.58(500 – Tₑ) = 1254(Tₑ – 30)

Clear bracket

1290 – 2.58Tₑ = 1254Tₑ – 37620

Collect like terms

1290 + 37620 = 1254Tₑ + 2.58Tₑ

38910 = 1256.58Tₑ

Divide both side by 1256.58

Tₑ = 38910 / 1256.58

Tₑ = 30.97 °C

Thus, the equilibrium temperature is 30.97 °C

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Answer:

the spiral type of galaxy

Our earth is situated in the Milky Way galaxy. The Milky Way galaxy is a spiral galaxy. Therefore, the correct option is option C.

The Milky Way constellation is indeed a huge spiral formation containing hundreds of trillions of stars, along with the Sun. the irregularly formed belt of stars and gas clouds visible from Earth that spans the sky. despite the reality that Earth is positioned within the Milky Way constellation, astronomers do not completely understand its nature, despite its proximity with other external star systems.

A dense layer of interstellar dust obscures the majority of the Galaxy from optical observatories, and astronomers can only understand its massive building with the assistance of radio and infrared telescopes, which can detect the forms of light that may travel through the obscuring material. Our earth is situated in the Milky Way galaxy. The Milky Way galaxy is a spiral galaxy.

Therefore, the correct option is option C.

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Answer:

28.12 kg

Explanation:

Here we are given that the density of copper is 8.92 g/ cm³ .

\(\sf \longrightarrow \rho_{(copper)}= 8.92 g/cm^3\\ \)

And we are interested in finding out the mass of the given block . The dimensions of the block is 0.052m × 311mm × 19.5 cm .

\(\sf \longrightarrow Volume_{cuboid}= length * breadth * height \\ \)

\(\sf \longrightarrow Volume = (0.052)(100) * (311\div 10) *(19.5) cm^3 \\ \)

\(\sf \longrightarrow Volume = 5.2 * 31.1 * 19.5 cm^3 \\ \)

\(\sf \longrightarrow Volume = 3153.54 cm^3\\ \)

Now we may use Unitary Method to find out the mass of the block as ,

Mass of 1cm³ of copper is 8.92 g .

Mass of 3153.54 cm³ of copper will be 8.92*3153.54 g = 28129.57 g

\(\sf \longrightarrow \underline{\boxed{\bf Mass_{Cu}= 28.12 \ kg }} \\ \)

Answer:

https://quizizz.com/admin/quiz/5902a3fd8d05b2100088880a/cat-1-chemistry-review

Explanation:

Answer:

atomic? hope this helps!

Explanation:

Answer:

Either direction

Explanation:

If you cook food it would go from cold to hot. If you were to put a drink in the fridge it would go from hot to cold. So it is either direction.

Those little lines on instrument are called markings or readings and make it easier to measure a substance.

These are the lines which are usually found on an instrument and signifies the pattern or the appropriate measurement which is contained in it. It is found in measuring instruments such as ruler etc and in some musical instrument.

The markings are usually very accurate so as to ensure that the results gotten are the same in any part of the world. This helps to reduce confusion and other issues which may arise from it thereby making it the most appropriate choice.

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Answer:

maalat ang salt

Explanation:

7.54 *\(10^8\) meters is  75.4 nanometers.

To convert 7.54 *  \(10^8\) meters to nanometers, you can multiply the value by \(10^9\)

as,  \(10^9\)nanometers = 1  meter.

7.54 * \(10^8\) m * \(10^9\) =  7.54 x \(10^1\) nm

Therefore, 7.54 *\(10^8\) meters is equal to 75.4 nanometers.

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To convert 7.54 x 10^-8 meters to nanometers, you multiply 7.54 x 10^-8 by 1 x 10^9 to get 75.4 nanometers.

To convert meters to nanometers, you need to know that 1 meter is equivalent to 1 x 109 nanometers. Therefore, if you were to convert 7.54 x 10-8 m to nanometers, you would multiply 7.54 x 10-8 by 1 x 109.

Here's how you'd do it: 7.54 x 10-8 m * 1 x 109 nm/m = 75.4 nm. So, 7.54 x 10-8 meters is equivalent to 75.4 nanometers.

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The vapor pressure lowering of water in this solution is 1165 torr.

What is vapor pressure?
The pressure that a vapour exerts on its condensed phases in a closed system at a specific temperature is known as the vapour pressure or equilibrium vapour pressure. An indicator of a liquid's evaporation rate is the equilibrium vapour pressure. It has to do with how easily liquid-borne particles tend to elude detection (or solid). Volatile is a term used to describe a chemical that, at room temperature, has a high vapour pressure. Vapor pressure is the force that a vapour cloud exerts over a liquid surface. The kinetic energy of a liquid's molecules increases along with the temperature. The number of molecules vaporising also rises as a function of the molecules' rising kinetic energy, which raises the vapour pressure.

the vapor pressure of water and the mixture is 355 torr and 760 torrs. Therefore, the value of vapor pressure of oxygen would be,

Ptotal=PO2+PH2O

760=PO2+355

760−355=PO2

405=PO2

So, at the temperature, the vapor pressure of  Ethylene is 405 torr.

When volume reduces to 50ml, the pressure of the oxygen would be,

P1V1=P2V2

where P1 and P2 are the pressure and V1 and V2 are the volumes.

P1V1=P2V2

P1V1/V2=P2

405×100 / 50=P2

810=P2

So, when the volume is 50ml the vapor pressure of the oxygen is 810 torr.

Now the total pressure of water-saturated oxygen at 50 ml volume is,

Ptotal=PO2+PH2O

Ptotal=810+355

Ptotal=1165

So, the total vapor pressure is 1165 torr.
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1) List the known and unknown quantities.

Initial conditions.

Concentration: 1.75 M NaF.

Volume: unknown.

Final conditions.

Concentration: 0.234 M NaF.

Volume: 681 mL.

2) Set the equation.

3) Plug in the known quantities and solve for V1.

We need 91.06 mL of a 1.75 M NaF solution to make 681 mL of a 0.234 M NaF solution.

.

Answer:

molar mass of H2CO3 = 72.0228

Answer:

62.02 g/mol

Explanation:

Took the test and got it right. if you have enough faith in brainly youll choose the right answer

A. Substance A will resist changing temperature the most since it has a higher specific heat than substance B. This means that it requires more energy to change its temperature by 1 degree Celsius compared to substance B.

B. Substance B will require the least amount of energy to change its temperature by 15 degrees Celsius since it has a lower specific heat than substance A. The amount of energy required to change the temperature of a substance is calculated by multiplying its specific heat by its mass and the temperature change.

C. To determine which substance would have a higher final temperature after 350 J of energy is applied, we need to use the formula:

Q = m * c * ΔT

where Q is the amount of energy applied, m is the mass of the substance, c is the specific heat, and ΔT is the change in temperature.

Let's assume that both substances have the same mass. For Substance A, we have:

350 J = m * 2.11 J/gC * ΔT

Solving for ΔT, we get:

ΔT = 350 J / (m * 2.11 J/gC)

Similarly, for Substance B, we have:

350 J = m * 0.38 J/gC * ΔT

ΔT = 350 J / (m * 0.38 J/gC)

Since we are assuming that both substances have the same mass, we can cancel out the "m" term in both equations.

Now we can compare the values of ΔT for each substance.

ΔT for Substance A = 350 J / (m * 2.11 J/gC) = 165.87 C

ΔT for Substance B = 350 J / (m * 0.38 J/gC) = 921.05 C

Therefore, Substance B would have a higher final temperature after 350 J of energy is applied to both samples of equal masses.

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Answer:

No it is not an exception to this principle

Explanation:

Work was carried out by this compressor to reduce the entropy of ice. What this means is that the ice gave out heat which is as a result  of the work that the compressor was putting in. there are violations of this principle

the entropy principle has that the entropy of the universe is always going to be more than 0 (system + surrounding). in this question, the that of the system is negative while that of the surrounding is positive.  As the refrigerator was cooling the water, the air outside was getting heated.  Outside this refrigerator, the gain in entropy is more than the entropy that was lost in the water.

the entropy of the universe once again is more than 0.

The correct answer is B. 8 molecules \(SO_3\). Option B

In the given reaction:

S(s) + \(O_2\)(g) → \(SO_3\)(g)

The stoichiometric coefficient in front of the \(SO_3\)molecule is 8, which indicates that 8 molecules of \(SO_3\)are formed as a product. This coefficient represents the ratio of the number of molecules involved in the reaction.

Option A (8 atoms \(SO_3\)) is incorrect because it only mentions the number of atoms, not molecules. The stoichiometric coefficient does not represent the number of atoms, but rather the number of molecules.

Option C (80.07g \(SO_3\)) is incorrect because it mentions a specific mass. The stoichiometric coefficient does not directly represent the mass of the substance, but rather the relative amount of molecules involved in the reaction.

Option D (32 \(SO_3\)) is incorrect because it mentions a specific volume. The stoichiometric coefficient does not directly represent the volume of the substance, but rather the relative amount of molecules involved in the reaction.

Therefore, the correct way to describe the \(SO_3\)component in the reaction is option B: 8 molecules \(SO_3\). This represents the ratio of the number of molecules of \(SO_3\)that are produced in the reaction.

Option B

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Answer:

no of moles=mass in gm÷molar mass so let x be the mass in gm

4.5=x÷35.5×2

x=4.5×35.5×2 grams

x=319.5 gm

Explanation:

formula

Answer:

Volume = 3.4 L

Explanation:

In order to calculate the volume of CO₂ produced when 15.2 g of CaCO₃ is heated, we need to first write out the balanced equation of the thermal decomposition of CaCO₃:

CaCO₃ (s) + [Heat] ⇒ CaO (s) + CO₂ (g)

Now, let's calculate the number of moles in 15.2 g CaCO₃:

mole no. = \(\mathrm{\frac{mass}{molar \ mass}}\)

                 = \(\frac{15.2}{40.1 + 12 + (16 \times 3)}\)

                 = 0.1518 moles

From the balanced equation above, we can see that the stoichiometric molar ratios of CaCO₃ and CO₂ are equal. Therefore, the number of moles of CO₂ produced is also 0.1518 moles.

Hence, from the formula for the number of moles of a gas, we can calculate the volume of  CO₂:

mole no. = \(\mathrm{\frac{Volume \ in \ L}{22.4}}\)

⇒ \(0.1518 = \mathrm{\frac{Volume}{22.4}}\)

⇒ Volume = 0.1518 × 22.4

                 = 3.4 L

Therefore, if 15.2 g of CaCO₃ is heated, 3.4 L of CO₂ is produced at STP.

0.6988M

Explanation:

Cobalt (II) chloride = CoCl2 Molar mass = 129.839 g/mol

Molarity = moles/liter of solution

\(Moles = 22.7g \times \frac{1mol}{129.893g} = 0.1747moles\)

\(Liters \: of \: solution = 250 ml \times \frac{1 L}{1000 ml} = 0.250 L\)

\( Molarity = \frac{0.1747 moles}{0.250 L}=0.6988 M\)

Answer:

Mass =  142.25 g

Explanation:

Given data:

Mass of Ca(OH)₂ = ?

Number of moles of Ca(OH)₂ = 1.92 mol

Solution:

Formula:

Mass = number of moles × molar mass

Molar mass of Ca(OH)₂ = 74.09 g/mol

by putting values,

Mass = 1.92 mol × 74.09 g/mol

Mass =  142.25 g

Answer:

B.

Explanation:

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Answer:

2nd One is correct