A counter-flow heat exchanger is used as a water-cooled condenser for ammonia. The ammonia enters the condenser as superheated vapor at 68∘C, and leaves as saturated liquid at 50∘C. The water, which flows on the outside, enters at 27∘C and leaves at 42∘C. The mass flow rate of the ammonia is 0.3 kg/s, and the condenser heat load is Q˙​cond​= 12 kWth​. Determine the following: a. The water mass flow rate in kg/s b. The product of the overall heat transfer coefficient and the area, UAs​, in W/∘C

Answer:

The higher your price, the less volume you have to produce for a given dollar amount of profit! Even a small price increase can generate significant additional profit. ... When a business comes out with a new product or service and they are the first to market, they may be able to charge high prices initially.

Explanation:

Answer:

V = 127.57 mL

Explanation:

In this case, we are having an acid base titration, and this, according to the overall reaction:

2H₃PO₄ + 3Ca(OH)₂ -----> Ca₃(PO₄)₂ + 6H₂O

This reaction was neutralized, so, it's a neutralization reaction, therefore, we can use the following expression for neutralization reactions:

n₁ = n₂  (1)

This is because, in the equivalence point, both moles of the reagents are the same. Now we need to do a relation between this and the actual moles that we have according to the overall reaction.

In this case, we have 2 moles of acid reacting with 3 moles of base, so, the equation (1) is re-written like this:

2n₁ = 3n₂   (2)

Knowing this, and that we have values of concentrations and volume, we can write the expression of moles in terms of molarity and volume:

n = M * V    replacing in (2):

2M₁V₁ = 3M₂V₂   From here, we can solve for V₂ which is the volume of the base:

V₂ = 2M₁V₁ / 3M₂   (3)

Now, all we have to do is replace the given values to obtain the volume of the base:

V₂ = 2 * 1.6 * 59.8 / 3 * 0.5

Answer:

\(V_{Ca(OH)_2}=0.287L=287mL\)

Explanation:

Hello,

In this case, given the reaction:

\(2 H_3PO_4 + 3 Ca(OH)_2 \rightarrow Ca_3(PO_4)_2 + 6 H_2O\)

We first compute the moles of phosphoric acid that are actually reacting given the volume (must be in litres) and the molarity:

\(n_{H_3PO_4 }=1.60\frac{mol}{L}*59.8mL*\frac{1L}{1000mL} =0.0957molH_3PO_4\)

Next, we compute the moles of calcium hydroxide that are reacting by using the 3:2 molar ratio with phosphoric acid:

\(n_{Ca(OH)_2}=0.0957molH_3PO_4*\frac{3molCa(OH)_2}{2molH_3PO_4} =0.144molCa(OH)_2\)

Finally, by knowing the 0.500 M of the calcium hydroxide solution we compute the required volume:

\(V_{Ca(OH)_2}=\frac{n_{Ca(OH)_2}}{M_{Ca(OH)_2}}=\frac{0.144mol}{0.500\frac{mol}{L} } \\ \\V_{Ca(OH)_2}=0.287L=287mL\)

Best regards.

Answer:

Chemists make observations on the macroscopic a scale that lead to conclusions about microscopic features

Explanation:

Many important chemical observations are made on the macroscopic scale. This is because, many of the scientific equipments available are not presently able to provide direct evidence about microscopic processes. Evidences obtained from macroscopic observations could serve as important insights into the nature of certain microscopic processes.

This is evident in the study of the structure of the atom. Most of the evidences that led to the deduction of the atomic structure were obtained from macroscopic evidence but ultimately provided important information about the microscopic structure of the atom.

Answer:

Not balanced.

Explanation:

It a double displacement reaction of a base and acid. The balanced equation is:

3Hg(OH)2 + 2H3PO4 → Hg3(PO4)2 + 6H2O

Based on the information provided, it is possible that the elongated crystals are tourmaline.

Tourmaline is a silicate mineral that contains boron, and it is known for its pyroelectric properties, meaning it can develop a charge on its ends when subject to heat or pressure. Tourmaline crystals can have a variety of colors and often have triangular terminations that are rounded or pointed. Tourmaline crystals are also known for their elongate and sometimes cylindrical shape, which could fit the description of the unknown crystals in question. However, without further information or analysis, it is difficult to definitively identify the crystals as tourmaline.

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A calcium-selective electrode typically uses a glass membrane. A calcium-selective electrode is a type of ion-selective electrode (ISE) that is used to measure the concentration of calcium ions in a solution.

The electrode consists of a membrane that is selective to calcium ions and a reference electrode. The membrane is designed to only allow calcium ions to pass through while blocking other ions. This allows the electrode to selectively measure the concentration of calcium ions in a solution. The type of membrane used in a calcium-selective electrode is usually made of glass or liquid. Glass membranes are commonly used because they are highly selective and stable, providing accurate and reliable measurements. Liquid membranes, on the other hand, are less stable but are more flexible and can be customized to suit specific applications. The membrane of a calcium-selective electrode contains a calcium-sensitive ionophore, which is a chemical that binds to calcium ions and generates a measurable electrical signal.

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The number of moles of substance present in the sample is 1.80 moles.

The number of moles of substance present in the sample is calculated by using the molar enthalpy of vaporization and the amount of energy required to vaporize the substance.

The amount of substance is calculated as follows;

moles = energy required / molar enthalpy of vaporization

moles = 57.0 kJ / 31.6 kJ/mol

moles = 1.80 mol

Therefore, the sample contains 1.80 moles of the substance

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Answer:

New Hampshire is the most in proverty.

Explanation:

I learned this before.

Answer:

Oklahoma state

Explanation:

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Molarity of the solution is 0.087 M, and the molality of the solution is 0.097 m.

To calculate the molarity, first, we need to convert the given mass of resveratrol to moles using its molar mass. The molar mass of resveratrol is (14 x 12.01 g/mol) + (12 x 1.01 g/mol) + (10 x 16.00 g/mol) = 228.25 g/mol. Therefore, the number of moles of resveratrol is 19 g / 228.25 g/mol = 0.0832 mol. Then we divide the moles of solute by the volume of the solution in liters (450 mL = 0.45 L) to get the molarity: 0.0832 mol / 0.45 L = 0.087 M.

To calculate the molality, we need to use the mass of the solvent, which is equal to the mass of the solution minus the mass of the solute. The mass of the solution is 19 g + (0.81 g/mL x 450 mL) = 382.5 g. Therefore, the mass of the solvent is 382.5 g - 19 g = 363.5 g. We convert the mass of the solvent to moles using its molar mass, which is the same as for the solvent.

The molar mass of the solvent is (12 x 1.01 g/mol) + (16 x 16.00 g/mol) = 80.08 g/mol. Therefore, the number of moles of the solvent is 363.5 g / 80.08 g/mol = 4.54 mol. Finally, we divide the moles of solute by the mass of the solvent in kilograms (363.5 g = 0.3635 kg) to get the molality: 0.0832 mol / 0.3635 kg = 0.097 m.

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The complete question is:

A student dissolves 19. g of resveratrol (C14H1,0) in 450. mL of a solvent with a density of 0.81 g/ml. The student notices that the volume of the solvent Calculate the molarity and molality of the student's solution. Be sure each of your answer entries has the correct number of significant digits. does not change when the resveratrol dissolves in it.

molarity _____

molality _____

An example of a physical change is the process of tempering steel to form a knife blade.

physical properties include melting, transition to a gas, change of strength, change of durability, changes to crystal form, textural change, shape, size, color, volume and density.

Answer:

The correct answer is slump

Explanation:

slump,  which occurs when rock and soil slide quickly down a steep slope. Such mass movement is common where road builders have cut highways through hills or mountains.

Answer:

slump

Explanation:

2021 edge

Answer:

about 900 degree Fahrenheit

Explanation:

Answer: B.has the highest air pressure

Explanation:

1.00 mol of water contains the most hydrogen atoms.

1 mol of water(H2O) contains 2 mol of hydrogen atoms

molar mass of hydrogen = 1.01 g/mol,

so 1 mol of water contains 21.01 = 2.02 g of hydrogen.

1 mol of Ammonia (NH3) contains 1 mol of hydrogen atoms

molar mass of hydrogen = 1.01 g/mol,

so 1 mol of ammonia contains 11.01 = 1.01 g of hydrogen.

hydrogen in 10.0 g of water  = 4.83 ×\(10^(22)\) hydrogen atoms

hydrogen in  15.00 g of ammonia = 1.48  ×\(10^(23)\) hydrogen atoms.

1 mol of water contains the most hydrogen atoms. This is because water, chemically represented as H2O, contains two hydrogen atoms for every oxygen atom. While 1 mol of ammonia(NH3) contains 1 mol of hydrogen atoms, 1 mol of water contains 2 mol of hydrogen atoms.

Therefore, 1 mol of water contains more hydrogen atoms than 1 mol of ammonia, and that's why option 3 -1 mol of water contains the most hydrogen atoms out of the options provided.

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Answer:

The correct answer is - 5 carbon compounds due to low to high intermolecular forces between their molecules.

Explanation:

Bottle C has gas in it and we know that alkane has carbon and hydrogen only which means they have a single sigma bond between them and very low intermolecular forces in between molecules and are present mostly at gaseous state. Thus, bottle C has alkane.

Alcohols have -OH group that can form rarely two pi bonds which means they have intermediate intermolecular force whereas acids have -cooH group with a high molecular force so bottle B with liquid is alcohol and A has acid.

Answer:

because in the different countries it is distributed unevenly.

Explanation:

hope this helps

In the biochemistry, Where reactants are normally dissolved in water, The strongest bond or interaction in the water is polar covalent bonds.

Water is a good solvent for polar and ionic compounds. the polarity and hydrogen bonding capability of water makes excellent solvent for polar molecules.In water ionic bonds come apart much more than covalent bonds.

The polarity  of water molecules is what makes a widely good solvent . The positive part of the water molecules attract negative part of solute and negative part of water attract positive part of solute.

Water greatly weaken the electrostatic forces and hydrogen bonding between ionic and polar molecules by competing for their attraction.

Hydrogen bonds are weaker than ionic bond and covalent bonds but stronger than dipole dipole interaction.  

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Answer:

and the siren goes wee-woo to what ever the circut

decides.Explanation:

Explanation:

7.2×1024 moleas

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A graph enables you to easily denote the relationship between variables as positive or negative.

This question is incomplete but I will try to help you as much as I can. A graph is one of the numerous was of data representation in science. A graph has two axes; the vertical ( Y - axis) and the horizontal (X - axis).

A graph enables you to easily denote the relationship between variables as positive or negative. A graph is sometimes called a scatter plot.

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According to the statement, the density of the metal is 2.702 g/ml.

The density of the metal can be calculated using the formula:

density = mass / volume

Where the mass is in grams (g) and the volume is in milliliters (ml).

Substituting the given values, we have:

density = 227.30 g / 84.2 ml

Calculating this gives:

density = 2.702 g/ml

Therefore, the density of the metal is 2.702 g/ml.

Knowing the density of a material can be useful in many applications, such as in engineering, construction, and manufacturing. It can help determine if a material is suitable for a particular use, such as whether it will sink or float in water, or whether it will be able to support a certain amount of weight. Additionally, the density of a material can help in identifying an unknown substance, as different materials have different densities.

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Option A - Linear.If all of the bonding electrons in a molecule are bonded in two hybrid sp orbitals,  the molecule most likely have linear shape.

An atom arrangement that is linear (less than a 180° angle) is referred to as a molecule. The centre atom of molecules with linear electron-pair geometries undergoes sp hybridization.

The two oxygen atoms are doubly linked to the carbon atom, which is the main atom of carbon dioxide. It can form bonds because it is tetravalent. The 180° angle formed by the electrons around the atom gives the molecule its linear molecular geometry.

A molecule is linear if it contains 2 bonds and 0 lone pairs. A molecule is trigonal planar if it contains 3 bonds but no lone pairs. A molecule is bent or angular if it contains 3 bonds and 1 lone pair.

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Answer:

The alkanes comprise a series of compounds that are composed of carbon and hydrogen atoms with single covalent bonds. This group of compounds comprises a homologous series with a general molecular formula of C n H 2 n+2 , where equals any integer.

Explanation:

The general formula for the alkane series is CnH2n+2

In this formula:

"Cn" shows how many carbon atoms are in the alkane molecule.

"H2n+2" shows the amount of hydrogen atoms in the alkane compound, with "n" being the number of carbon atoms.

Alkanes are a group of hydrocarbons that only have single bonds between their carbon atoms. The formula says that each carbon atom is connected to two hydrogen atoms. And the total number of hydrogen atoms in an alkane molecule is two more than double the number of carbon atoms.

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Running a blank solution is crucial in spectrophotometry experiments to establish the zero %T and account for background absorbance. Without running a blank, the results can be affected by systematic errors.

It is important to run a blank solution to set the zero %T in both Parts 1 and 2 of the experiment because it helps to account for any background absorbance or interference from the solvent or other components in the sample. Running a blank solution allows us to establish a baseline measurement of the solvent or the solution without the analyte, which helps in accurately measuring the absorbance caused by the analyte of interest.

If a blank solution is not run, the results can be affected in several ways:

Systematic Error: The absence of a blank solution can introduce a systematic error, causing a constant offset in the measured absorbance values. This offset can lead to incorrect calculations and interpretations.

Overestimation or Underestimation: Without running a blank, the measured absorbance may include contributions from the solvent or other interfering substances. This can lead to overestimation or underestimation of the analyte concentration, affecting the accuracy of the results.

Distorted Beer's Law Plot: In the absence of a blank, the plot obtained may not accurately represent the linear relationship between concentration and absorbance according to Beer's Law. This can lead to incorrect calculations of the slope (molar absorptivity) and affect the accuracy of future concentration determinations.

In spectrophotometry, the blank solution serves as a reference for setting the zero %T (transmittance) or absorbance value. By measuring the blank, we can account for any absorbance caused by the solvent, impurities, or other components in the sample. The blank solution typically contains all the components except the analyte of interest. It is measured under the same conditions as the sample solutions.

The blank measurement allows us to subtract any background absorbance from the sample measurements, providing a more accurate representation of the absorbance caused solely by the analyte. This helps in obtaining reliable and precise measurements for concentration determination using Beer's Law.

Running a blank solution is crucial in spectrophotometry experiments to establish the zero %T and account for background absorbance. Without running a blank, the results can be affected by systematic errors, inaccurate concentration determinations, and distorted Beer's Law plots. It is important to always include a blank solution to ensure accurate and reliable measurements.

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If 0.01 mol of neon gas at a particular temperature and pressure occupies a volume of 0.225 L, then 0.05 mol of neon gas would occupy a volume of 1.125 L under the same conditions.

Given:

Number of moles of neon gas (n₁) = 0.01 mol

Volume of neon gas (V₁) = 0.225 L

We are required to find the volume of neon gas (V₂) when the number of moles (n₂) is 0.05 mol under the same conditions.

The relationship between the number of moles, volume, and pressure of a gas is given by the ideal gas law: PV = nRT, where P is the pressure, V is the volume, n is the number of moles, R is the ideal gas constant, and T is the temperature.

Since the temperature and pressure are the same in this case, we can rearrange the ideal gas law equation to solve for the volume:

V = (n₁ * V₁) / n₂

Substituting the given values into the equation:

V₂ = (0.01 mol * 0.225 L) / 0.05 mol

V₂ = 0.00225 L / 0.05 mol

V₂ = 0.045 L/mol

Therefore, 0.05 mol of neon gas would occupy a volume of 1.125 L under the same conditions.

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KF makes up 1.669 gms of the mixture's mass. The total of all the atomic masses or mass numbers of the constituent elements in a compound or molecule constitutes this quantity.

Given;

Total weight of mixture \($(L i F+K F)=5.97 \mathrm{gms}$\)

Let, mass of KF in the mixture be xg m s.

\($\Longrightarrow$\) mass of L i F$ in mixture = (5.97 - x) gms.

Note:

Atomic weight of F=19 gms.

Atomic weight of L i=7gms.

Atomic weight of K=39 gms.

moles = mass  molecular weight

Thus, moles of K F=x / 58

and moles of LiF = (5.97 - x) / 26

F atoms make up 1 mole in 1 mole of KF. Likewise, there are 1 mol of F atoms in 1 mol of LiF. Thus,

\($& \text { moles of } \mathrm{F} \text { in } K F=\text { molesof } K F=x / 58--(1) \\\)

\($& \text { moles of } \mathrm{F} \text { in } L i F=\text { molesof } L i F=(5.97-x) / 26--(2)\)

From (1) \& (2), we get;

Total moles of Fluorine = (x / 58) + ((5.97 - x) / 26)

Hence, total weight of Fluorine in sample = moles ×  Atomic weight

=((x / 58)+((5.97-x) / 26)) ×  19 gms

=3.90 gms .-\text {--(given) }

Now, solving the equation for x, we get;

26x + (5.97 ×  58) - 58x = 3.9 × 58 ×  26 / 19

22x = 346.26-309.537

Therefore, x = 36.723 / 22

=1.669 gms

Thus, mass of KF in the mixture is 1.669 gms

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Answer:

Salt molecules block water molecules from packing together when temperature is lowered. It then prevents them from becoming ice. More water molecules leave the solid phase than the ones entering the solid phase. Freezing point depression occurs when the freezing point of the liquid is lowered by addition of solute.

Explanation: