If the enthalpy change for the combustion 2. 00 g of propane, C3H8, was determined to be −102. 5 kj by calorimetry, what is the calculated enthalpy change for the combustion of one mole of propane under the same conditions?

Answer:

Potassium (K)

Explanation:

Out of the four options, Potassium is the only one to fill a total of 4 energy levels.

Both Cesium (Cs) and Rubidium (Rb) fill more than three energy levels, with Cesium filling 6 and Rubidium filling 5.

Sodium (Na) only fills 3 energy levels.

Thus, that leaves Potassium (K), which has 4 energy levels.

Hope this helped ^-^

The proportional gain \($K_p$\) is 0.775.

Proportional gain, often denoted as Kp, is a parameter used in control systems to adjust the output of a controller proportional to the error signal. In other words, it is the gain applied to the error signal to produce a corrective action.

In a closed-loop control system, the proportional gain is multiplied by the error signal, which is the difference between the setpoint and the process variable, to generate the controller output. A higher value of Kp results in a larger output for the same error signal, meaning that the control action is more aggressive. On the other hand, a lower value of Kp results in a smaller output, meaning that the control action is more gentle.

Proportional gain is just one of several parameters that can be adjusted in a control system to achieve the desired performance. The selection of the appropriate gain values depends on the dynamics of the process being controlled, as well as the desired response characteristics of the closed-loop system.

The transfer function of the closed-loop system is given by:

\($$G_c(s) = \frac{K_p G(s)}{1 + K_p G(s)}$$\)

The characteristic equation of the closed-loop system is given by:

\($$1 + K_p G(s) = 0$$\)

The desired closed-loop pole location is given by:

\($$s_{c\ desired} = -\zeta w_n + jw_n\sqrt{1-\zeta^2}$$\)

Substituting the given values, we get:

\($$s_{c\ desired} = -8.32 + j12.6$$\)

Since the closed-loop pole is a complex conjugate pair, the open-loop transfer function must have a pole at the same location. Therefore, we set:

\($$s_{p\ desired} = -\zeta w_n = -8.32$$\)

Solving for \($K_p$\) using the desired pole location, we get:

\($$K_p = \frac{w_n^2}{a} \cdot \frac{1}{|s_{c\ desired} + 22 + 2|} = 0.775$$\)

Therefore, the proportional gain \($K_p$\) is 0.775.

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Answer: With each input, there is an output, a recipe requires certain ingredients, and certain amounts of each. A recipe calls for measurements, missing something can ruin it, just like a chemical formula, take something out or add something else, you get something completely different. when putting things together to make something you have to make sure what your putting in, will give you the product you want as the output.

Explanation:

Answer:

a. a part of ionic bond with Cl

Answer: A. The free-moving electrons transmit heat quickly.

Explanation:

Answer:

the free-moving electrons transmit heat quickly.

Explanation:

i just took the test

Answer: Lower Left!

Explanation: I just took the quiz.

Answer:

A.All Mixtures Are Made Up Of Solutions

Explanation:

Since the water increased by 7 degrees for the peanut and 3 degrees for the chip, the conclusion would be that the peanut has more energy than the chip.

Calorimetry is the science of measuring the quantity of energy, usually in the form of heat, that is released during a reaction.

In this case, the energy released by the peanut and the chip were measured using calorimetry. The energy released was captured by the water and helps raise the temperature of the water.

The more energy released by the substances, the more the temperature of the water is raised.

Thus, since the peanut raised the temperature of the water by 7 degrees while the chip was only able to raise it by just 3 degrees, one can effectively conclude that the peanut has more energy than the chip.

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Answer:

HFusion*mass + Spec.Heat*mass*ΔT + HVap*mass

80cal/g*50.0g + 1.00cal/g°C*50.0g*(100°C-0°C) + 540cal/g*50g

3.60x10⁵cal

Explanation:

Using the HFusion we can find the heat needed to convert the ice to liquid water.

With specific heat capacity we can find the heat needed to increase the temperature of water from 0 to 100°C.

With HVap we can find the heat to convert the liquid water into steam.

The equations are:

Computing the values:

36000cal =

Answer:

2.6299

its easy

The main minerals that may contribute to hypertension when consumed in excess include sodium, potassium, and calcium.

Eating too much of certain minerals can lead to hypertension, a condition that can cause high blood pressure.

Too much sodium can cause the body to retain water, leading to increased blood pressure.

Potassium can also affect blood pressure, as it influences the amount of sodium in the body.

Calcium is important for regulating the contraction and relaxation of muscles, including those of the heart. When calcium levels become too high or excess, it may lead to hypertension.

Therefore, it is important to keep an eye on your mineral intake to ensure that it remains within healthy limits.

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Answer:

nickel, cobalt would decrease in size when it became an iron

The given reaction of silver nitrate with sodium chloride is an example of double displacement reaction where, two groups replaces each other. Thus, option D is correct.

Displacement reaction is a type of reaction in which a species from a reactant is displaced by other species or group from reagent. There are single displacement reaction as well as double displacement reaction.

In single displacement reaction, only one group is displaced by another group from the second reactant. Whereas in double displacement reaction, two groups are displaced each other between two reactants.

In the reaction between silver nitrate and sodium chloride, the nitrate group and chloride group interchange between the metals silver and sodium as written in the reaction. Hence, it is a double displacement reaction.

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Your question is incomplete, but your complete question probably was:

Jose and Sue were investigating the formation of precipitates in chemistry lab. They

mixed a silver nitrate solution with a sodium chloride solution and immediately a

white solid appeared in the bottom of the test tube. This white solid is a precipitate

of silver chloride. The reaction is represented with the equation:

AgNO3(aq) + NaCl (aq) → AgCl (s) + NaNO3(aq)

The equation represents a ________________ reaction.

A) synthesis

B) decomposition

C) neutralization

D) double replacement

Answer:

A

Explanation:

HCl and NaOH is a strong acid and strong base, respectively, and hence dissociates completely and reacts to form water:

\(\displaystyle \text{H}_\text{(aq)}^+ + \text{OH}_\text{(aq)}^- \longrightarrow \text{H$_2$O}_\text{($\ell$)}\)

We are given that 25.0 mL of 0.333 M NaOH was used to neutralize 15.0 mL of HCl.

Convert from moles of NaOH used to moles of HCl reacted:
\(\displaystyle \begin{aligned} 25.0\text{ mL} & \cdot \frac{0.333\text{ mol NaOH}}{1\text{ L}} \cdot \frac{1\text{ L}}{1000\text{ mL}} \cdot \frac{1\text{ mol OH}^-}{1\text{ mol NaOH}}\cdot \\ \\ & \cdot\frac{1\text{ mol H}^+}{1\text{ mol OH}^-} \cdot \frac{1\text{ mol HCl}}{1\text{ mol H}^+}\\ \\ & = 8.33\times 10^{-3}\text{ mol HCl}\end{aligned}\)

Therefore, the molarity of the original HCl solution is:
\(\displaystyle \begin{aligned} \ [\text{HCl}] & = \frac{\text{ mol HCl}}{\text{L soln.}} \\ \\ & =\frac{8.33\times 10^{-3}\text{ mol HCl}}{15.0\text{ mL}} \cdot \frac{1000\text{ mL}}{1\text{ L}} \\ \\ & = 0.555\text{ M}\end{aligned}\)

In conclusion, our answer is A.

Answer:

I will try to solve these problems

If we assume that Geraldine knows the empirical formula and the molar mass of the compound , then the molecular formula is C2H4O2 .

we need to first calculate the empirical formula mass by adding the atomic masses of all the atoms in the empirical formula. Then, we can divide the molar mass by the empirical formula mass to determine the molecular formula's "multiplicity factor." Finally, we multiply the subscripts in the empirical formula by the multiplicity factor to obtain the molecular formula.

if the empirical formula mass of the compound is 30 grams per mole and the molar mass is 60 grams per mole, the multiplicity factor would be 2. Therefore, if the empirical formula is CH2O, the molecular formula would be C2H4O2.

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Answer:

-4452 kJ is given off from 5.00 moles of CH4.

-4763.64 kJ is given off from 85.6 grams of CH4.

Explanation:

First, let's write the equation:

a. We want to know how much energy is given off when 5.00 moles of CH4 are burned, so if we 'multiply' all the coefficients by 5.00 moles, the enthalpy change (ΔH) will also be multiplied by 5.00, so we're going to have:

-4452 kJ is given off from 5.00 moles of CH4.

Now, to find how much energy is released when 85.6 g of CH4 are burned, we have to find the number of moles using the molar mass of CH4 which is 16 g/mol (you can calculate the molar mass of a compound using the periodic table). The conversion will look like this:

We have 5.35 moles of CH4, so we have to follow the same steps that we did before:

-4763.64 kJ is given off from 85.6 grams of CH4.

Explanation:

A prism is a solid geometric figure with two identical parallel bases that are both polygons, and the lateral faces are parallelograms with pairs of opposite sides of equal length.

Answer:

solute and solvent

Explanation:

Answer:

from 10-14

Explanation:

the pH of potassium hydroxide is extremely high and is a strong base although the exact value depends on the concentration of the base in water.

Answer:

We use the following formula as given below Use the formula below to find the lone pair on the oxygen atom of the SO3 molecule. L.P (O) = V.E (O) – N.A (S-O) Lone pair on the terminal oxygen atom in SO3 = L.P (O)

Explanation:

The element that can be found in both plays and stories is "characters."

Characters are an essential element of both plays and stories. They are the individuals or entities that drive the narrative, interact with each other, and contribute to the development of the plot. In plays, characters are typically portrayed by actors who perform their roles on stage, while in stories, characters are described and depicted through written words.

Characters can be central or supporting figures in a play or story, and they play a vital role in engaging the audience or readers. They have distinct personalities, motivations, and relationships that influence the events and conflicts within the narrative. Through their actions, dialogue, and character development, they contribute to the overall themes and messages conveyed by the play or story.

Whether it is a theatrical production or a written narrative, the presence and portrayal of characters are fundamental to creating engaging and compelling plays and stories.

Thus, the element that can be found in both plays and stories is "characters."

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Aluminum's mass is 78.39 grams.

You may calculate the mass of aluminum using a substance's density.

Aluminum's density is 2.70.

Volume of aluminum (al) = mass of aluminum (m) = m/v = m/29 glml

Algebraic density divided by hydrogen density gives the specific gravity.

H2O's density is 1 glml.

m = 2.7 * 29 = 78.39; 2.70 = m/29 glml /1 glml m/29 = 2.70

Aluminium mass = 78.39.

Aluminum, for instance, has a density of 2.7 g/cm3. The phrase "every cubic centimeter of aluminum has a mass of 2.7 g" is another way to state this. Its mass is 5.4 g if you have 2 cubic centimeters of space. An object with a 3 cm3 volume would weigh 8.1 g.

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Answer:

Explanation:

The Tacoma Narrows Bridge is the historical name given to the twin suspension bridge—originally built in 1940—that spanned the Tacoma Narrows strait. It collapsed just four months later due to aeroelastic flutter. Since then, this topic has become popular, with several case studies discussing the failure phenomenon of suspension cable bridges.

In the state of Washington, the construction of the Tacoma Narrows Bridge was completed and opened to the traffic on July 1st, 1940. It was the very first bridge to incorporate a series of plate girders as roadbed support, and the first bridge of its type (cable suspension). It was also the third largest suspension bridge of its time, with a 2800-foot central span and two side spans of 1100 feet each.

A west-side approach had a continuous steel girder of 450ft, while the east side had a long reinforced concrete frame of 210ft.  It had two cable anchorages of 26ft. along roadways, two 5ft. sidewalks and two 8ft. deep stiffening girders. Among several other structural details, the suspension cable anchorages to which the cables were connected were made of 20,000 cubic yards of concrete, 6 lakh pounds of structural steel, and 2.7 lakh pounds of reinforcing steel. Because of its extremely long length, it was considered a ‘narrow bridge’. The overall construction cost was estimated to be a whopping $6 Million in 1940. Considering inflation, this is equivalent to almost $1 Billion, and all of this for something that lasted just four months and seven days. Yet, this remains a great engineering feature for civil engineers to ponder over.

Explanation:

47.0g is the mass of ammonia

There are 3 number of lab groups with 5 students each if there are 39 students in the class and groups are divided by 4 or 5 students each. This is calculated by solving the linear equations.

Let us consider the number of groups of 4 = x

and group of 5 = y

There are 39 students in Ms. Salazar's chemistry class. If Ms. Salazar divides the class into 9 lab groups of 4 or 5 students each.so,

4x + 5y = 39

Mr. Salazar divided the class into 9 groups.so,

x + y = 9

here, the Linear equations consist of 2 variable x and y.

Linear equation is an algebraic equation in the form y=mx + b. involving only a constant and a linear term, where m is the slope and b is the y-intercept. This is also called a linear equation of two variables where y and x are the variables. To solve the equation we have to multiply each equation by a suitable number so that the two equations have the same leading coefficient. Subtract the second equation from the first. then solve the new equation for y. then substitute the value of y into either Either the first equation or the second equation and solve for x.

by solving these 2 linear equations we get,

x = 6

y = 3

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Along with the Aufbau principle and Hund's rule, the Pauli Exclusion principle is one of the key concepts governing the arrangement of electrons in an atom.

According to the Pauli exclusion principle, no two electrons may simultaneously hold the same set of quantum numbers or quantum states. A distinct quantum number and set of quantum states should exist for every electron.We learned from the definition of the Pauli exclusion principle that no two electrons with the same spin can be placed together at once, and no two electrons with the opposite spin can be ordered in a single quantum state. The Pauli exclusion principle is just as significant in chemistry as it is in physics.

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Answer:

The correct option is;

D Global warming would decrease the surface tension of water, making it harder for water striders to walk on water

Explanation:

Global warming involves the heating of the ecosystems on Earth due to human activity, which results in rising temperatures

As the temperature of the water rises due to global warming the surface tension decreases due to the increasing ratio of the force of higher kinetic energy water molecule to inter-molecular cohesive forces pulling the water together, which tends to weaken the effect of the cohesive forces and thus reduce the surface tension

As the surface tension has been reduced, the water striders will find it difficult to walk on the water surface as the maximum weight the water surface can lift without shearing, due to surface tension is reduced.