what is the maximum amount of heat in joules that 23 grams of water at 95oc can lose before freezing completely?

Answers

Answer 1

23 grams of water at 95°C can lose a maximum of 8883.64 Joules of heat before freezing completely.

To answer your question, we need to calculate the heat loss required to lower the temperature of 23 grams of water from 95 degrees Celsius to 0 degrees Celsius, which is the freezing point of water. The specific heat capacity of water is 4.184 Joules per gram per degree Celsius.

So, the initial energy of the water is:

E1 = m x c x ΔT
E1 = 23 g x 4.184 J/g°C x (95°C - 0°C)
E1 = 8883.64 J

Where E1 is the initial energy of the water, m is the mass of water, c is the specific heat capacity of water, and ΔT is the change in temperature.

The final energy of the water at 0°C is:

E2 = m x c x ΔT
E2 = 23 g x 4.184 J/g°C x (0°C - 0°C)
E2 = 0 J

So, the maximum amount of heat in joules that 23 grams of water at 95°C can lose before freezing completely is:

ΔE = E1 - E2
ΔE = 8883.64 J - 0 J
ΔE = 8883.64 J

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Related Questions

mercury has the widest variation in surface temperatures between night and day of any planet in the solar system.

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Mercury has the widest variation in surface temperatures between night and day of any planet in the solar system.

This statement is true. Mercury experiences the greatest temperature variation between night and day due to several factors. The main reasons are its proximity to the Sun, slow rotation, and lack of atmosphere.

During the daytime, temperatures on Mercury can reach up to 800°F (430°C) due to its close proximity to the Sun. This extreme temperature difference is due to the fact that Mercury's thin atmosphere is unable to regulate temperature and its slow rotation causes one side of the planet to be constantly facing the sun while the other is in perpetual darkness.

At night, temperatures can drop as low as -290°F (-180°C) because of its slow rotation and the lack of an atmosphere to retain heat. This results in the widest variation in surface temperatures between night and day of any planet in our solar system.

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Mercury indeed has the widest variation in surface temperatures between night and day of any planet in the solar system. This is primarily due to its thin atmosphere, which cannot effectively retain heat, leading to extreme temperature fluctuations.

Mercury, being the closest planet to the sun, experiences extreme variations in temperature between its day and night sides. During the day, when the sun is overhead, the surface temperature on Mercury can rise to a scorching 430°C (800°F), which is hot enough to melt lead. However, as Mercury rotates and the sun sets, the temperature drops drastically to as low as -180°C (-290°F) at night.

The main reason for this extreme temperature variation is that Mercury has no atmosphere to regulate its surface temperature. Unlike Earth, which has an atmosphere that helps to distribute heat around the planet, Mercury's surface is directly exposed to the sun's radiation. This means that when the sun is shining on Mercury's surface, it heats up quickly and intensely, causing the temperature to rise to extreme levels.

Overall, the lack of an atmosphere and Mercury's proximity to the sun are the main factors contributing to the extreme temperature variations on the planet.

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which of the following is true about the absorption and metabolism of alcohol? alcohol is metabolized by most tissue and organs in the body. the majority of alcohol is absorbed in the stomach. men and women do not metabolize alcohol at significantly different rates. acetaldehyde produced during alcohol metabolism is highly toxic.

Answers

The statement "acetaldehyde produced during alcohol metabolism is highly toxic" is true about absorption and metabolism of alcohol. Option 4 is correct.

Acetaldehyde is a byproduct of alcohol metabolism, and it is a toxic substance that can cause various symptoms such as facial flushing, nausea, and headache. Acetaldehyde is rapidly converted to acetate by the enzyme aldehyde dehydrogenase, which is then metabolized further to carbon dioxide and water.

However, if alcohol is consumed at a high rate, the liver may not be able to metabolize all of the acetaldehyde, leading to a buildup of this toxic substance in the body. This can result in more severe symptoms such as vomiting, rapid heartbeat, and difficulty breathing. Therefore, it is important to consume alcohol in moderation and allow enough time for the liver to metabolize the alcohol and its byproducts. Hence Option 4 is correct.

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a 1.25 g sample of co2 is contained in a 750. ml flask at 22.5 c. what is the pressure of the gas, in atm?

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The pressure of gas is 1.05 atm when a 1.25 g sample of CO₂ is contained in a 750ml flask at 22.5°C.

Molecular weight of CO₂ is 1.25g ,Volume of CO₂ is 750ml,Temperature of CO₂ is 22.5°C and the gas constant is 0.08206 L atm/mol K.

Using the ideal gas law equation the pressure is found to be 1.05 atm.

To calculate the pressure of the gas, we can use the ideal gas law equation: [tex]PV=nRT[/tex]
Where P is the pressure, V is the volume, n is the number of moles, R is the gas constant, and T is the temperature in Kelvin.
First, we need to convert the volume to liters by dividing by 1000: 750 ml = 0.75 L.
Next, we need to calculate the number of moles of CO₂ present in the flask. We can use the molecular weight of CO₂ to convert from grams to moles:

[tex]1.25 * (1 /44.01 ) = 0.0284 mol[/tex]
Now we can plug in the values into the ideal gas law equation:

[tex]PV=nRT[/tex]
[tex]P * 0.75 L = 0.0284 mol  * 0.08206 L*atm/mol*K * (22.5 + 273.15) K[/tex]
Simplifying and solving for P, we get:
[tex]P = (0.0284 * 0.08206 * 295.65) / 0.75 = 1.05 atm[/tex]
Therefore, the pressure of the gas in the flask is 1.05 atm.

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a normal penny has a mass of about 2.5g. if we assume the penny to be pure copper (which means the penny is very old since newer pennies are a mixture of copper and zinc), how many atoms of copper do 9 pennies contain?

Answers

9 pennies contain approximately [tex]2.13 x 10^23[/tex] atoms of copper.

To solve this problem, we need to use the following steps:

Determine the molar mass of copper.

Convert the mass of 9 pennies from grams to moles.

Use Avogadro's number to calculate the number of atoms of copper.

Step 1: The molar mass of copper (Cu) is approximately 63.55 g/mol.

Step 2: The mass of 9 pennies is:

9 pennies x 2.5 g/penny = 22.5 g

Converting this mass to moles, we get:

22.5 g / 63.55 g/mol = 0.354 moles

Step 3: Using Avogadro's number ([tex]6.022 x 10^23 atoms/mol)[/tex], we can calculate the number of atoms of copper:

Therefore, 9 pennies contain approximately[tex]2.13 x 10^23 a[/tex]toms of copper.

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you have 400 grams (g) of a substance with a half life of 10 years. how much is left after 100 years?

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After 100 years, there will be 6.25 grams of the substance remaining.

What is half life?

Half-life is the time it takes for half of the radioactive atoms in a sample to decay or for the concentration of a substance to decrease by half.

Amount remaining = initial amount x (1/2)^(number of half-lives)

In this case,  half-life of the substance is 10 years, which means that after 10 years, half of the substance will have decayed. After another 10 years (20 years total), half of remaining substance will decay, leaving 1/4 of the original amount. After another 10 years (30 years total), half of that remaining amount will decay, leaving 1/8 of the original amount. This process continues every 10 years.

To find the amount of substance remaining after 100 years, we need to know how many half-lives have occurred in that time: 100 years / 10 years per half-life = 10 half-lives

Amount remaining = 400 g x (1/2)¹⁰= 6.25 g

Therefore, after 100 years, there will be 6.25 grams of the substance remaining.

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4. if 1 drop of acid is equal to 50 microliter. calculate the concentration of h ion and the ph of the solution when 1 drop of 0.25 m hcl is added to 3 ml water. does that conform to your observation in part d. if not, why?

Answers

We are given that 1 drop of 0.25 M HCl is added to 3 mL of water, and we need to find the concentration of H+ ions and the pH of the solution is  2.39

First, let's determine the volume of the HCl solution in the mixture. Since 1 drop of acid is equal to 50 microliters, we have 50 microliters = 0.05 mL

Now, let's find the total volume of the mixture (HCl + water):
0.05 mL (HCl) + 3 mL (water) = 3.05 mL

Next, we need to calculate the moles of H+ ions from the HCl solution. We know that the concentration of the HCl solution is 0.25 M, so:
moles of H+ = (0.25 mol/L) × (0.05 L/1000) = 0.0000125 mol

To find the concentration of H+ ions in the mixture, we divide the moles of H+ by the total volume of the mixture:
[H+] = (0.0000125 mol) / (3.05 L/1000) = 0.004098 mol/L

Now we can calculate the pH of the solution using the formula:
pH = -log10[H+]
pH = -log10(0.004098) ≈ 2.39

The pH of the solution is approximately 2.39 after adding 1 drop of 0.25 M HCl to 3 mL of water.

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Please show explanation: If 1 drop of acid is equal to 50 microliter. Calculate the concentration of H+ ion and the pH of the solution when 1 drop of 0.25 M HCl is added to 3 mL water?

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phenacetin can be prepared from p-acetamidophenol, which has a molar mass of 151.16 g/mol, and bromoethane, which has a molar mass of 108.97 g/mol. the density of bromoethane is 1.47 g/ml. what is the yield in grams of phenacetin, which has a molar mass of 179.22 g/mol, possible when reacting 0.151 g of p-acetamidophenol with 0.12 ml of bromoethane?

Answers

The theoretical yield of phenacetin is 0.17922 g. However, the actual yield may be lower due to factors such as incomplete reaction, loss during purification, or experimental error.

To calculate the theoretical yield of phenacetin, we need to first determine the limiting reagent. The limiting reagent is the reactant that will be completely consumed in the reaction, thus limiting the amount of product that can be produced.

First, we need to convert the volume of bromoethane given in milliliters to grams, using its density:

0.12 ml x 1.47 g/ml = 0.1764 g bromoethane

Next, we can use the molar masses of p-acetamidophenol and bromoethane to determine the number of moles of each:

moles p-acetamidophenol = 0.151 g / 151.16 g/mol = 0.001 mol

moles bromoethane = 0.1764 g / 108.97 g/mol = 0.00162 mol

Since the reaction requires a 1:1 molar ratio of p-acetamidophenol to bromoethane, and the number of moles of p-acetamidophenol is smaller than the number of moles of bromoethane, p-acetamidophenol is the limiting reagent.

The theoretical yield of phenacetin can be calculated using the molar mass of phenacetin and the number of moles of p-acetamidophenol:

moles phenacetin = 0.001 mol p-acetamidophenol

mass phenacetin = 0.001 mol x 179.22 g/mol = 0.17922 g

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PLEASE ANSWER ASAP
1. How many atoms are present in 8.500 mole of chlorine atoms?
2. Determine the mass (g) of 15.50 mole of oxygen.
3. Determine the number of moles of helium in 1.953 x 108 g of helium.
4. Calculate the number of atoms in 147.82 g of sulfur.
5. Determine the molar mass of Co.
6. Determine the formula mass of Ca3(PO4)2.
IT WOULD BE HELPFUL

Answers

1) 5.1167 x 10²⁴atoms of chlorine. 2) 248.00 g. 3) 4.8825 x 10⁷ moles of helium. 4) 2.7757 x 10²⁴ atoms of sulfur.  5) Molar mass of Co (cobalt) is 58.93 g/mol.  6) Formula mass =  310.18 g/mol.

What is meant by formula mass?

Sum of the atomic masses of all the atoms in chemical formula is called formula mass

1.)  Number of atoms = 8.500 moles x 6.022 x 10²³ atoms/mole = 5.1167 x 10²⁴ atoms of chlorine.

2.) Molar mass of oxygen is 16.00 g/mol. Therefore:

Mass of 15.50 moles of oxygen = 15.50 moles x 16.00 g/mol = 248.00 g.

3.) Molar mass of helium is 4.00 g/mol. Therefore, the number of moles of helium in 1.953 x 10⁸ g is:

Number of moles = 1.953 x 10⁸ g / 4.00 g/mol = 4.8825 x 10⁷ moles of helium.

4.) Molar mass of sulfur is 32.06 g/mol. Therefore, the number of moles of sulfur in 147.82 g is:

Number of moles = 147.82 g / 32.06 g/mol = 4.6084 moles of sulfur.

To find the number of atoms, we can use Avogadro's number again:

Number of atoms = 4.6084 moles x 6.022 x 10²³ atoms/mole = 2.7757 x 10²⁴ atoms of sulfur.

5.) Molar mass of Co (cobalt) is 58.93 g/mol.

6.) Ca₃(PO₄)₂ contains 3 calcium atoms, 2 phosphorus atoms, and 8 oxygen atoms.

Atomic masses of these elements are:

Calcium (Ca) = 40.08 g/mol

Phosphorus (P) = 30.97 g/mol

Oxygen (O) = 16.00 g/mol

Therefore, formula mass of Ca₃(PO₄)₂ is:

Formula mass = (3 x 40.08 g/mol) + (2 x 30.97 g/mol) + (8 x 16.00 g/mol)

= 120.24 g/mol + 61.94 g/mol + 128.00 g/mol

= 310.18 g/mol.

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how many atmospheres of pressure would there be if you started at 5.75 atm and changed the volume from 5 l to 1 l ?

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The pressure would be 28.75 atm if the volume is changed from 5 L to 1 L, starting from an initial pressure of 5.75 atm.

To solve this problem, we can use the combined gas law equation, which relates the pressure, volume, and temperature of a gas:

P1V1/T1 = P2V2/T2

where P1 and V1 are the initial pressure and volume, T1 is the initial temperature, P2 and V2 are the final pressure and volume, and T2 is the final temperature. Since the temperature is constant in this problem, we can simplify the equation to:

P1V1 = P2V2

Substituting the given values, we get:

5.75 atm × 5 L = P2 × 1 L

Solving for P2, we get:

P2 = (5.75 atm × 5 L) / 1 L = 28.75 atm.

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addictive substances, for which demand is inelastic, are products for which producers can pass higher costs on to consumers.

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The statement is correct. Producers of addictive substances, for which demand is inelastic, can pass higher costs on to consumers.

Inelastic demand refers to a situation where changes in price have little effect on the quantity demanded of a product. Addictive substances, such as tobacco or drugs, often have inelastic demand because users are willing to pay high prices for the product regardless of changes in price.

Producers of addictive substances can take advantage of this inelastic demand by increasing prices without seeing a significant decrease in demand. This means that they can pass on any higher costs, such as increased taxes or production costs, to the consumers, who are likely to continue purchasing the product even at a higher price.

This is often seen in the tobacco industry, where governments may increase taxes on cigarettes as a way to discourage smoking, but the tobacco companies can simply pass on the higher costs to consumers who continue to buy the product.

Therefore, it can be concluded that producers of addictive substances, for which demand is inelastic, can pass higher costs on to consumers.

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The cloud droplets in a cloud are formed by water vapor molecules and: A) protons. B) ions. C) molecules of air. D) condensation nuclei.

Answers

Answer:

condensation nuclei

Explanation:

What is the concentration (in molality) of an aqueous solution of NaCl made by adding
4.56 g of NaCl to enough water to give 20.0 mL of solution. Assume the density of the
solution is 1.03 g/mL

Answers

Answer:

data given

mass of NaCl 4.56

dissolved volume 20ml(0.02l)

density of solution 1.03g/ml

Required molality

Explanation:

molarity=m/mr×v

where

m is mass

mr molar mass

v is volume

now,

molarity=4.56/58.5×0.02

molarity =3.9

: .molarity is 3.9mol/dm^3

According to molal concentration, the concentration (in molality) of an aqueous solution of NaCl is 0.0047 mole/kg.

What is molal concentration?

Molal concentration is defined as a measure by which concentration of chemical substances present in a solution are determined. It is defined in particular reference to solute concentration in a solution . Most commonly used unit for molal concentration is moles/kg.

The molal concentration depends on change in volume of the solution which is mainly due to thermal expansion. Molal concentration is calculated by the formula, molal concentration=mass/ molar mass ×1/mass of solvent in kg.

In terms of moles, it's formula is given as molal concentration= number of moles /mass of solvent in kg.

Substitution in formula gives the answer but first mass of solution is determined which  is density×volume= 1.03×20=20.6 g , mass of solvent= 20.6-4.56=16.05, thus molal concentration=4.56/58.5×1/16.05=0.0047 moles/kg.

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how many moles of naf must be dissolved in 1.00 liter of a saturated solution of pbf2 at 25˚c to reduce the [pb2 ] to 1 x 10–6 molar? (ksp pbf2 at 25˚c = 4.0 x 10–8)

Answers

The moles of NaF that must be dissolved in 1.00 liter of a saturated solution of PbF₂ at 25˚C to reduce the [Pb²⁺] to 1 x 10⁻⁶ molar is 2.0 x 10⁻⁵.

The solubility product expression for PbF₂ is given by:

Ksp = [Pb²⁻][F-]²

At equilibrium, the product of the ion concentrations must be equal to the solubility product constant. We are given that the [Pb²⁺] in the saturated solution is 1 x 10⁻⁶ M. Therefore, we can use the Ksp expression to calculate the concentration of F- in the solution:

Ksp = [Pb²⁺][F⁻]²4.0 x 10⁻⁸ = (1 x 10⁻⁶)([F⁻]²)[F⁻]² = 4.0 x 10⁻²[F⁻] = 2.0 x 10⁻¹

Now, we can calculate the amount of NaF needed to reduce the [F⁻] concentration to 2.0 x 10⁻¹ M. Since NaF is a 1:1 electrolyte, the concentration of F- will be equal to the concentration of NaF added.

Number of moles of NaF = (2.0 x 10⁻¹) mol/L x 1.00 L = 2.0 x 10⁻¹ moles

However, we need to dissolve this amount of NaF in a saturated solution of PbF₂. Therefore, we need to check that the amount of NaF we added will not exceed the maximum amount that can dissolve in the solution at 25˚C.

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a sample of nobr was placed on a 1.00l flask containing no no or br 2 at equilibrium the flask contained

Answers

At equilibrium, the concentrations of NO, Br2, and NOBr in the flask will remain constant. However, without specific values for the initial concentration of NOBr or the equilibrium constant (Kc), it's not possible to determine.

.Based on the provided information, it seems that a sample of NOBr was placed in a 1.00 L flask at equilibrium, which means that the NOBr has decomposed into NO and Br2.

At equilibrium, the concentrations of NO, Br2, and NOBr in the flask will remain constant. However, without specific values for the initial concentration of NOBr or the equilibrium constant (Kc), it's not possible to determine the exact concentrations of these substances in the flask.

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A sample of NOBr being placed in a 1.00 L flask containing no NO or Br2 at equilibrium, I'll first provide the balanced chemical equation for the reaction:

[tex]2 NOBr (g) ⇌ 2 NO (g) + Br2 (g)[/tex]

At equilibrium, the concentrations of the reactants and products remain constant. To determine the concentrations of NOBr, NO, and Br2 at equilibrium, we need to follow these steps:

1. Write the expression for the equilibrium constant (Kc) based on the balanced chemical equation:
[tex]Kc = [NO]^2 [Br2] / [NOBr]^2[/tex]

2. Set up an ICE (Initial, Change, Equilibrium) table to determine the equilibrium concentrations of the species involved in the reaction. The initial concentrations of NO and Br2 are 0 since they are not initially present in the flask.

      NOBr      NO      Br2
I      C0        0        0
C     -2x        +2x      +x
E     C0-2x     2x       x

3. Substitute the equilibrium concentrations from the ICE table into the Kc expression:
[tex]Kc = (2x)^2 * x / (C0-2x)^2[/tex]


4. To solve for x, you need the value of Kc for the reaction. Look up the Kc value for this reaction in a reference or use provided information. Once you have Kc, substitute it into the equation and solve for x.

5. Calculate the equilibrium concentrations of NOBr, NO, and Br2 by substituting the value of x back into the ICE table:

[NOBr] = C0-2x
[NO] = 2x
[Br2] = x

By following these steps, you can determine the concentrations of NOBr, NO, and Br2 in the 1.00 L flask at equilibrium.

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Eight years ago Zack& Co. had purchased an equipment fo: $1,200,000. This equipment was being depreciated on a straight line basis over a 12 year period to a 300,000 salvage value. The equipment has six more years of economic life. During this period the annual revenues and operating costs assocaited with this machine are expected to be $388,000 and $87,500, respectively. Zack is now considering replacing this machine with a more modern one. The old equipment can now be sold for $180,000. Investment in net working capital is expected to increase by $132,000 as a result of the investment. The new machine will cost $1,500,000 and another $120,000 will be needed to modify it. This machine falls into the ACRS 5-year class life. It. is also expected to have an economic life of SiX years. The annual revenue and operating costs from the new machine are expected to be $750,000 and $58,000, respectively. At the sixth year Zack expects to sell the nes machine for $180,000. Zack's marginal tax rate is 34%. The equipment will be equity financed. (14 pts.) 1 Please calculate Zack's Net Investment and the Net Cash flows for the next six years if the replacement decision is made. 3. Haz un grfico con los datos de la tabla adjunta. Empieza en el ao 0 y termina en 2007. Responde:a. A qu tipo de crecimiento corresponde, lineal o exponencial?b. Qu bucle de retroalimentacin coincide con este crecimiento? Enumera algunos factores que hayan contribuido a este aumento progresivo de la poblacin mundial. greg is paid for the number of hours he works or for the number of units he produces, whichever is higher. which form of compensation does greg receive? 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Restex's corporate tax rate is 38%, and its market capitalization is $185 million. a.If Restex's free cash flow is expected to be $10 million one year from now and will grow at a constant rate, what expected future growth rate is consistent with Restex's current market value? b.Estimate the value of Restex's interest tax shield. a.If Restex's free cash flow is expected to be $10 million one year from now and will grow at a constant rate, what expected future growth rate is consistent with Restex's current market value? If Restex's free cash flow is expected to be $10 million in one year, the expected future growth rate is ____%. (Round to two decimal places.) b.Estimate the value of Restex's interest tax shield. Interest tax shield value is $____million. (Round to the nearest million.)