how cold does it have to be to evaporate boiling water

The volume of 8.8g of carbon dioxide at STP is 4.38 L.

1 mole of any gas will take up 22.4 L of space at standard temperature and pressure (STP). A balanced chemical equation and the Ideal Gas Law can be used to determine the amount or mass of gas consumed or created in a chemical process.

n = m/M

where m is the molar mass of carbon dioxide and M is its mass in terms of molecules.

Considering that the molar mass of carbon dioxide is 44.01 g/mol:

n = 8.8 g / 44.01 g/mol

n = 0.1998 mol

Next, we can plug in the values of n, R, P, and T into the ideal gas law and solve for V:

V = (nRT)/P

V = (0.1998 mol x 0.0821 L·atm/(mol·K) x 273.15 K) / 1 atm

V = 4.38 L

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It will take approximately 8.26 days for the amount of iodine-131 to drop from 50.0 mg to 17.5 mg.

To determine the number of days it will take for the amount of iodine-131 (I-131) to drop from 50.0 mg to 17.5 mg, we can use the radioactive decay formula:

Amount(t) = Amount(0) * e^(-λt)

Where:

- Amount(t) is the amount of I-131 at time t.

- Amount(0) is the initial amount of I-131.

- λ (lambda) is the decay constant.

- t is the time elapsed.

We can rearrange the formula to solve for t:

t = (1/λ) * ln(Amount(0) / Amount(t))

Substituting the given values:

- Amount(0) = 50.0 mg

- Amount(t) = 17.5 mg

- λ = 0.0864 1/days

t = (1/0.0864) * ln(50.0 / 17.5)

Using a calculator, we can compute the value:

t ≈ 8.26 days

Therefore, it will take approximately 8.26 days for the amount of iodine-131 to drop from 50.0 mg to 17.5 mg.

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The principle of faunal succession is a key concept in the study of prehistoric life and the age of sedimentary rocks. It is based on the idea that the fossilized remains of different species of animals and plants found in sedimentary rocks can be used to infer the relative age of the rocks and the conditions that existed when they were formed.

The principle of faunal succession states that over time, the species of animals and plants that lived in a particular area changed and evolved. As a result, the fossilized remains of different species found in sedimentary rocks can be used to infer the relative age of the rocks.

This principle is based on the idea that the fossil record is a record of the evolution of life on Earth. In addition, the principle of faunal succession also provides insight into the ancient environment and climate. For example, the presence of certain types of fossils, such as coral reefs or tropical plants, may indicate that the area was once a warm, shallow sea.

In all, the principle of faunal succession is a powerful tool that connects prehistoric life to the age of sedimentary rocks. By studying the fossilized remains of different species found in sedimentary rocks, scientists can infer the relative age of the rocks and the conditions that existed when they were formed.

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1 mole of CO2 is 6.022 x 10^23 molecules of CO2. It is also 44.01 g of CO2. Here 44.01 g comes as the sum of individual atoms of CO2 i.e. 12.01 + 16 + 16 i.e. 44.01 g

CO2 is composed of one carbon atom and two oxygen atoms, which have the atomic masses of 12.01 g/mol and 16.00 g/mol respectively. So, the molar mass of CO2 is the sum of the atomic masses of the atoms that make up CO2, which is 12.01 + 16.00 + 16.00 = 44.01 g/mol. Carbon dioxide (CO2) is a naturally occurring compound made up of one carbon atom and two oxygen atoms. It is a colorless, odorless gas and is a byproduct of many biological and industrial processes. CO2 is a greenhouse gas, which means it helps trap heat in the Earth's atmosphere and contributes to global warming.

Therefore, one mole of CO2 weighs 44.01 grams.

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Using an excess of a reactant in a chemical reaction ensures complete reaction, increases yield, compensates for side reactions or losses, and facilitates reaction monitoring.

It's is a common practice for several reasons:

Ensuring Complete Reaction: By providing an excess of one reactant, it ensures that the other reactant is entirely consumed in the reaction. This is particularly important when the stoichiometry of the reaction requires a specific ratio between the reactants.

Having an excess ensures that the limiting reactant is not exhausted prematurely, allowing the reaction to proceed to completion.

Increasing Reaction Yield: In some cases, having an excess of a reactant can increase the overall yield of the desired product. This is especially true when the excess reactant is less expensive or easier to handle than the other reactant.

By ensuring a surplus of the cheaper or more accessible reactant, the reaction can maximize the production of the desired product.

Compensation for Side Reactions or Losses: In complex reactions, side reactions or losses can occur, leading to a decrease in the yield of the desired product.

Having an excess of one reactant can help compensate for these losses by providing an ample supply to continue the main reaction pathway.

Facilitating Reaction Monitoring: In some cases, the excess reactant can act as a reference or marker, making it easier to monitor the progress of the reaction.

By tracking the consumption of the excess reactant, it becomes simpler to determine the extent of the reaction and the reaction rate.

It's important to note that the decision to use an excess of a reactant depends on the specific reaction and its requirements. Factors such as cost, reactant availability, and desired product yield need to be carefully considered when determining the appropriate stoichiometry for a reaction.

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A chemical reaction is a process where reactants are transformed into new products.

Reactants are the initial chemicals, and products are the new chemicals that are generated. There are times when the amount of reactants utilized in a reaction is more than the amount theoretically needed. This is known as an excess of reactants. The excess of reactants can be added for various reasons.

The reasons are as follows:

1.Incomplete reaction:

When a reaction is incomplete due to a lack of sufficient amounts of reactants, the reaction does not proceed to completion.

Therefore, to guarantee that the reaction goes to completion, it is critical to use an excess of reactants.

2. Reaction Yield:

Using excess reactants increases the yield of the desired product. This means that more products are generated.

3. Catalyst:

In certain reactions, the excess of reactants serves as a solvent or diluent that keeps the catalyst in an optimal concentration, hence allowing the reaction to continue at a faster pace.

For instance, in a reaction that employs sulfuric acid as a catalyst, excess sulfuric acid will keep the reaction going at a rapid pace.

4. Error margin:

When conducting experiments, it is important to have a good margin of error. Adding an excess of reactants ensures that there are enough reactants to get the desired product. The correct amount of reactants can be determined by calculating the percentage yield.

For example, if the theoretical yield is 100 g but the actual yield is only 150 g, the percentage yield will be (150 / 100) x 100 = 150 percent.

The given terms used in the answer are:

1. 1502. Excess3. Chemical

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To determine the solution with the lowest amount of ions or molecules dissolved in water, we need to calculate the total number of ions or molecules in each solution.

1. 500 ml of 2.25 M \(CH_3OH\):

  Methanol \(CH_3OH\) does not ionize or dissociate in water. Therefore, the total number of ions or molecules in this solution is equal to the number of moles of \(CH_3OH\). Since the molarity is given as 2.25 M, the number of moles can be calculated as follows:

  Moles of  \(CH_3OH\)= molarity × volume

  Moles of  \(CH_3OH\)= 2.25 M × 0.5 L (converting 500 ml to liters)

  Moles of  \(CH_3OH\) = 1.125 mol

  Thus, this solution contains 1.125 moles of  \(CH_3OH\):.

2. 500 ml of 0.75 M NaI:

  Sodium iodide (NaI) dissociates into Na+ and I- ions in water. The total number of ions in this solution can be calculated as follows:

  Moles of NaI = molarity × volume

  Moles of NaI = 0.75 M × 0.5 L

  Moles of NaI = 0.375 mol

  Since NaI dissociates into one Na+ ion and one I- ion, the total number of ions in this solution is twice the number of moles of NaI:

  Total ions = 2 × Moles of NaI

  Total ions = 2 × 0.375 mol

  Total ions = 0.75 moles of ions

  Thus, this solution contains 0.75 moles of ions.

3. 1.5 L of 0.5 M \(Na_3PO_4\):

  Sodium phosphate  \(Na_3PO_4\) dissociates into three Na+ ions and one \(PO_4^{3-}\) ion in water. The total number of ions in this solution can be calculated as follows:

  Moles of  \(Na_3PO_4\)  = molarity × volume

  Moles of  \(Na_3PO_4\) = 0.5 M × 1.5 L

  Moles of  \(Na_3PO_4\) = 0.75 mol

  Since  \(Na_3PO_4\) dissociates into three Na+ ions and one \((PO)_4^{3-}\) ion, the total number of ions in this solution can be calculated as follows:

  Total ions = 3 × Moles of  \(Na_3PO_4\) + 1 × Moles of  \(Na_3PO_4\)

  Total ions = 3 × 0.75 mol + 1 × 0.75 mol

  Total ions = 3.75 moles of ions

  Thus, this solution contains 3.75 moles of ions.

4. 20 L of 225 M CuCl:

  Copper chloride (CuCl) dissociates into one Cu2+ ion and two Cl- ions in water. The total number of ions in this solution can be calculated as follows:

  Moles of CuCl = molarity × volume

  Moles of CuCl = 225 M × 20 L

  Moles of CuCl = 4500 mol

  Since CuCl dissociates into one Cu2+ ion and two Cl- ions, the total number of ions in this solution can be calculated as follows:

  Total ions = 1 × Moles of CuCl + 2 × Moles of CuCl

  Total ions = 1 × 4500 mol + 2 × 4500 mol

  Total ions = 13500 moles of ions

  Thus, this solution

contains 13,500 moles of ions.

5. 1.75 L of 1.25 M HBO:

  Boric acid (HBO) does not fully dissociate in water. Therefore, we need to consider the undissociated molecules in this solution. The total number of molecules in this solution can be calculated as follows:

  Moles of HBO = molarity × volume

  Moles of HBO = 1.25 M × 1.75 L

  Moles of HBO = 2.1875 mol

  Thus, this solution contains 2.1875 moles of HBO molecules.

Comparing the total number of ions or molecules in each solution, we can conclude that the solution with the lowest amount of ions or molecules dissolved in water is 500 ml of 2.25 M CH3OH, which contains only 1.125 moles of CH3OH molecules.

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Answer:

Explanation: Of course the negative charge of the electron cloud is balanced by the positive charge of the atomic nucleus for neutral molecules. ... If we were doing this again today, we would designate the electronic charge as positive (and of course the nuclear charge would thus be NEGATIVE!)

Explanation:

Answer

- What is an electron?

An electron a stable subatomic particle with a negative charge of electricity, it is found in all atoms and acting as the primary carrier of electricity in solids.

- How does the electrons movement creates an electric current?

Electrons flow in a certain rate, creating an electric current. So the electrons moving freely from one place to another place will conduct electric current.

Answer:

The temperature is kept constant. What new volume does the gas occupy? Two hundred liters of gas at zero degrees Celsius are kept under a pressure of 150 kPa.

Explanation:

Oxygen gas is at a temperature of 40°C when it occupies a volume of 2.3 liters. 

Answer:

S + HNO3 = H2SO4 + NO2 + H2O

Explanation:

Answer:

Based on stoichiometry HNO3 to H2O is 6:2

Use 9 grams to find the moles of HNO3

9 grams/63g/mol=0.143 moles of HNO3

HNO3:H2O

6:2

0.143*2/6=0.048

H2O moles is 0.048moles

Mass of water =0.048moles*18g/mol=0.864g

To the nearest tenth=0.9grams

Explanation:

I think this is right

Answer:

D.) 1.71 M NaCl

Explanation:

Molarity equation: M= n/v

n= moles of solute

v=liters of solution

NaCl= 58.443 g/mol

30g NaCl / 58.443g/mol = 0.5133(this is n)

0.5133 mols/0.300 L=1.71115674 M

Answer:

products, it's answer A.

Answer:

products

Explanation:

It will take approximately 196 years for a 70-mg sample of strontium-90 to decay to a mass of 56 mg.

Radioactive decay is a process in which unstable atomic nuclei lose energy by emitting radiation. The rate at which radioactive decay occurs can be described using a parameter called the half-life. The half-life is the time it takes for half of the radioactive material to decay.

In this case, the half-life of strontium-90 is given as 28 years. This means that after 28 years, half of the initial amount of strontium-90 will decay.

To calculate the time it takes for the sample to decay to a mass of 56 mg, we can use the concept of half-lives.

Initially, we have a 70-mg sample of strontium-90. After the first half-life of 28 years, the mass will be reduced to 35 mg (half of 70 mg). After the second half-life, it will be reduced to 17.5 mg (half of 35 mg). This process continues until we reach a mass of 56 mg.

By calculating the number of half-lives required to reach a mass of 56 mg, we can determine the time it takes.

Starting with 70 mg, we need to divide it by 2 repeatedly until we reach 56 mg:

70 mg ÷ 2 = 35 mg

35 mg ÷ 2 = 17.5 mg

17.5 mg ÷ 2 = 8.75 mg

8.75 mg ÷ 2 = 4.375 mg

4.375 mg ÷ 2 = 2.1875 mg

2.1875 mg ÷ 2 = 1.09375 mg

1.09375 mg ÷ 2 = 0.546875 mg

0.546875 mg ÷ 2 = 0.2734375 mg

It takes a total of 7 half-lives to reach a mass of approximately 56 mg. Since each half-life is 28 years, we multiply the number of half-lives by the length of each half-life:

7 half-lives × 28 years/half-life = 196 years

Therefore, it will take approximately 196 years for a 70-mg sample of strontium-90 to decay to a mass of 56 mg.

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Answer:

Copper siliconquadoxide

Explanation:

We have that the first step is to put the Power source into an on state,Thereby powering the Light point and the Spectrophotometer.

From the question we are told

identify the first step in preparing a spectrophotometer for use.

Generally

This is a device is out there to help scientist i the mostly in the field of chemistry.

Therefore

The first step is to put the Power source into an on state,Thereby powering the Light point and the Spectrophotometer.

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The summer solstice occurs when the earth is in a position so that the North Pole is tilted most directly toward the sun.

The summer solstice happens when a pole on either the northern hemisphere or southern hemisphere, is found most inclined toward the sun.

In conclusion, the summer solstice occurs when the earth is in a position so that the North Pole is tilted most directly toward the sun.

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Answer: B and D also hi

Explanation:

The mechanism of glyceraldehyde 3-phosphate dehydrogenase in glycolysis  does not include phosphorylation of the substrate using ATP. Hence, option a is false.

Glyceraldehyde 3-phosphate dehydrogenase, or GAPDH, is an enzyme with a molecular mass of approximately  37 kDa that catalyzes glycolysis' sixth stage, converting glucose into energy and carbon molecules.

Initially, the carbonyl group of GAP is attacked by a cysteine residue in the active site of GAPDH, resulting in the formation of a hemithioacetal intermediate (covalent intermediate).

At the active site of the enzyme, a histidine residue deprotonates the hemithioacetal . In the ensuing thioester intermediate, deprotonation promotes the reformation of the carbonyl group and the ejection of a hydride ion. Not any step include the use of ATP. Thus, option a is false.

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Your question is incomplete. But, your complete question probably was:

The mechanism of glyceraldehyde-3-phosphate dehydrogenase does NOT involve. true or false?

A phosphorylation of the substrate using ATP.

B oxidation and phosphorylation of the substrate.

C a covalent intermediate.

D an active site histidine to serve as a proton acceptor.

Approximately 162 grams of N2 are needed to produce 35 grams of H2.

The balanced chemical equation for the reaction between nitrogen gas (N2) and hydrogen gas (H2) to produce ammonia (NH3) is:

N2 + 3H2 → 2NH3

From this equation, we can see that the mole ratio of N2 to H2 is 1:3. This means that for every 1 mole of N2 used, 3 moles of H2 are consumed.

To calculate how many grams of N2 are needed to produce 35 grams of H2, we first need to convert the mass of H2 to moles:

moles of H2 = mass / molar mass

molar mass of H2 = 2.016 g/mol

moles of H2 = 35 g / 2.016 g/mol ≈ 17.37 mol

Since the mole ratio of N2 to H2 is 1:3, the number of moles of N2 needed is one-third of the number of moles of H2:

moles of N2 = (1/3) × moles of H2

moles of N2 = (1/3) × 17.37 mol ≈ 5.79 mol

We can convert the moles of N2 to grams using the molar mass of N2:

molar mass of N2 = 28.02 g/mol

mass of N2 = moles × molar mass

mass of N2 = 5.79 mol × 28.02 g/mol ≈ 162 g

Therefore, approximately 162 grams of N2 are needed to produce 35 grams of H2.

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Answer:

where the slope of the titration curve is the greatest

The titration curve can be used to identify the equivalency point of the titration.The volume of titrant is where the titration curve has the steepest slope.

How do you find the equivalence point on a titration curve?

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Answer:

a.  P=188mmHg

Explanation:

A gas undergoing a change of volume and pressure at constant temperature (and not changing the number of molecules), follows Boyle's Law:  \(P_1V_1=P_2V_2\)

The units of these quantities can be any measure of pressure and volume, so long as long as the units are the same between beginning and ending conditions.

Substitute and solve:

\(P_1V_1=P_2V_2\)

\((685[mmHg])(131[mL])=P_2(478[mL])\)

\(\dfrac{(685[mmHg])(131[mL\!\!\!\!\!\!\!\!\!{--}])}{478[mL\!\!\!\!\!\!\!\!\!{--}]}=\dfrac{P_2(478[mL]\!\!\!\!\!\!\!\!\!\!\!\!\!\!\!\!\!\!\!\!\!\!{----})}{478[mL] \!\!\!\!\!\!\!\!\!\!\!\!\!\!\!\!\!\!\!\!\!\!{----}}\)

\(187.730125523[mmHg]=P_2\)

Accounting for significant figures, \(P_2=188[mmHg]\)

They give us the balanced equation of the reaction.

3 KOH + H3PO4 → K3PO4 + 3H2O

So we can continue with the calculations.

We first find the moles of K3PO4 that will be formed. For that we look at the stoichiometric coefficients of the reaction. The K3PO4 to KOH ratio is 1/3. So the moles of K3PO4 will be:

To find the mass we must multiply the moles found by the molar mass of potassium phosphate. The molar mass of potassium phosphate is:212.3g/mol

Answer: The mass of potassium phosphate produced is 149 grams

Answer:

Chemical Change

Explanation:

It became white and became solid which makes it a chemical change.

The cost of using 14,400 watts hour would be  $43.2.

Energy is defined as the capacity to do work.

It is given in the question that

A 1600 watts electric oven is used for 9 hours

Power * Time

power = 1600 watts

Time = 9 hours

Total energy consumed = 1600 watts * 9 hours
= 14,400 watts hour

energy is measured in Kilowatts hour

= 14,440 watts hour

14,440/1000 kwh

= 14.4 kwh

It is given that the cost per unit of energy is $3.00 per kwh

Therefore , the cost of using 14,400 watts hour would be 14.4 * 3

= $43.2

The function of Voltmeter and Ammeter is to measure Voltage and Current respectively.

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Answer:

Definetly Nitrogen

Explanation:

Nitrogen is the most electronegative

What a person will sell in a business venture depends on the population age distribution of the target population.

Business refers to any venture that an individual or group of individuals indulges in for the purpose of making profit. You do not get into a business blindly. You need accurate information about the business before you can engage in it.

What a person will sell in a business venture depends on the population age distribution of the target population.

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248.4 °C

Explanation:

Boiling point: -246 °C

Atomic mass: 20.1797 u

Symbol: Ne

The formula C₁₂H₂₂O₁₁, which describes sugar, is an example of the symbolic domain.

In this context, the macroscopic domain refers to the observable properties and behavior of substances at a larger scale, while the microscopic domain refers to the structure and interactions at the molecular or atomic level. The symbolic domain, on the other hand, involves the use of symbols, such as chemical formulas, to represent substances.

The formula C₁₂H₂₂O₁₁ represents a sugar molecule. It provides information about the composition and ratio of atoms in the molecule, allowing us to identify and differentiate it from other substances. This representation belongs to the symbolic domain because it employs chemical symbols (C, H, and O) to represent the elements and subscripts to denote the number of atoms in the molecule.

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Answer: A

Explanation: Based on the Law of conservation of mass the total mass of the reactants will equal to the total mass of the products. This happens as matter is not destroyed.