A sample of gas in a rigid container is at 25. 0 degrees Celsius and 1. 00 atm. What is the pressure of the sample when heated to 220. 0 degrees Celsius

Answer:

EIA projects less than a quarter of the world's electricity generated from coal by 2050. net electricity generation by fuel.

Explanation:

The AH value for the combustion of ethane, as represented by the given balanced chemical equation, is -1560.6 kJ/mol. The energy is absorbed during this reaction.

In the balanced chemical equation provided, 2 moles of ethane (C₂H6) react with 7 moles of oxygen gas (O2) to produce 4 moles of carbon dioxide (CO₂) and 6 moles of water vapor (H₂O). The AH value represents the change in enthalpy, or heat, during the reaction per mole of reactant.

To determine the AH value, we can look at the coefficients of the reactants and products in the balanced equation. In this case, 2 moles of ethane react to produce 4 moles of carbon dioxide and 6 moles of water vapor. The AH value is calculated per mole of reactant, so we can divide the AH value by the number of moles of ethane (2) to get the AH value per mole of ethane.

The given value of -84.7 kJ is the AH value per mole of ethane, so we need to multiply it by the number of moles of ethane in the balanced equation (2) to get the total AH value for the reaction. Therefore, the AH value is -84.7 kJ/mol × 2 mol = -169.4 kJ.

However, it's important to note that the given AH value (-84.7 kJ) appears to be incorrect in the question. The actual value for the combustion of ethane is around -1560.6 kJ/mol. This value represents the energy released or absorbed during the reaction. In this case, the negative sign indicates that energy is absorbed, meaning the reaction is endothermic.

In summary, the AH value for the combustion of ethane is -1560.6 kJ/mol, and the energy is absorbed during the reaction.

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A molecule is made up of two or more atoms held together by chemical bonds in a stable association. The atoms may or may not belong to the same element

Molecules refer to groups of two or more atoms that are held together by chemical bonds in a stable association. This bond is formed when the electrons that orbit the atoms' nucleus intermingle. As a result, the atoms' outermost shells fill up with electrons, providing stability to the molecule. The atoms in a molecule may belong to the same element or to different elements.

When they belong to different elements, the molecule formed is called a compound molecule. For example, carbon dioxide (CO₂) is a compound molecule that consists of one carbon atom and two oxygen atoms. The bond between these atoms is formed because the carbon atom requires two more electrons to fill its outer shell while the oxygen atoms require two electrons each to fill their outer shells, resulting in a stable molecule.

Therefore, a molecule is made up of two or more atoms held together by chemical bonds in a stable association. The atoms may or may not belong to the same element.

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The heat of combustion for the unknown hydrocarbon when1 mole of an unknown hydrocarbon is burned in a bomb calorimeter and the Calorimeter increases in temperature by 12.19°C is -611.26kJ/mol

A device that is mostly used to measure combustion temperatures. The reaction occurs in a sealed area known as the calorimeter proper, in constant thermal contact with its surroundings (the jacket).

To calculate the heat of combustion we follow the given steps:

Heat released by the combustion =Cp×ΔT=1.929×12.19 kJ=23.51 kJ

Hence, ΔH=−23.51 kJ/g

A unknown hydrocarbon has an empirical formula of CH and a molar mass of 26 g/mol.

So,  ΔH combustion=−23.51×26g /mol=−611.26kJ/mol

Hence, ΔH combustion=−15.6×180 kJ/mol=−611.26kJ/mol

ΔH combustion=−611.26kJ/mol

Hence, the heat of combustion for the unknown hydrocarbon when1 mole of an unknown hydrocarbon is burned in a bomb calorimeter and the Calorimeter increases in temperature by 12.19°C is -611.26kJ/mol

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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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Answer:

dependant variable

Explanation:

:)

Answer:

Dependant variable.

It's correct

Explanation:

The mass of gum you need to chew to chew one mole of sugar is approximately 5.68 × 10-22 grams.

To calculate the mass of gum that you need to chew to chew one mole of sugar, you need to use the following steps:

Step 1: Find the molar mass of the sugar

The molar mass of sugar is 342.3 g/mol.

Step 2: Convert molar mass to gramsTo convert the molar mass to grams, you need to divide it by Avogadro's number (6.022 × 1023), which gives you 5.68 × 10-22 grams of sugar.

Step 3: Find the mass of gum needed since it is not provided how much sugar is present in a single piece of gum, we can assume that it is negligible.

Therefore, the mass of gum needed to chew one mole of sugar is approximately 5.68 × 10-22 grams.

Hence, the mass of gum you need to chew to chew one mole of sugar is approximately 5.68 × 10-22 grams.

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Answer & Procedure

To solve this problem you will need to transform all the concentrations to the equivalence of ppm, which is 1 mg of solute per 1 L of solution.

Calcium: There are 43 μg of calcium in a total volume of 87 mL.

Caffeine: There is 0.91 mg of caffeine in a total volume of 105 mL.

Trace particles: There is 0.47 mg of trace particles in a total volume of 95 dL.

Answer:

Explanation: it is true

The measure of the energy in any EM waves is electron volts (eV).

The Electromagnetic waves (EM waves) are the waves that are made up of both electric and magnetic fields that oscillates around a field.

The electromagnetic wave can be measured in electron volts (eV) because is can be described in terms of its energy—in units of measure.

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Answer:

B. - Strong bonds require more energy to form.

Explanation:

Well, process of elimination says it's B, since A, C, & D aren't correct. A is incorrect because atom size doesn't affect bond strength. C is incorrect because it is alot easier for weak bonds to form. D is incorrect because temperature doesn't affect bond strength either.

Answer: The answer is A

Explanation: All matter is made of atoms

A stair step is approximately 7 inches, or 0.58 feet, tall on average. A total height of approximately 5.8 feet can be obtained by multiplying by 10 steps.

The term "height" typically refers to the distance that separates a person or an object's bottom from its top. Height can be measured from an object's base to its highest point, whereas in the context of a person, it is typically measured from the bottom of their feet to the top of their head. Common measurements of height include meters, feet, inches, and centimeters. It is an important physical trait that can have an impact on a person's health, appearance, and ability to participate in certain activities, among other things.

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Aqueous potassium permanganate that has been diluted with carbon tetrachloride with bromine. Pentane and 1-pentane are distinguished by reagents.

An unsaturation test can be performed using the bromine in carbon tetrachloride solution. Use 100 ml of carbon tetrachloride and bromine to evaluate the unsaturation of a compound when it is insoluble in water. The bromine water turns gray as a result of how the bromine reacts with an alkene's carbon-carbon double bonds. With the help of bromine, an alkene is transformed into an alkane by breaking the carbon-carbon bond.

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Answer:10

Explanation: good job

So there are 13 hydrogen atoms in the molecule of (S)-2-methylbutanoic propanoic anhydride.

To determine how many hydrogen atoms are there in the molecule of (S)-2-methylbutanoic propanoic anhydride, let's first understand the structure of the molecule.

The molecule consists of two parts: 2-methylbutanoic acid and propanoic acid, connected by an anhydride bond. Here's the breakdown of the hydrogen atoms in each part:
1. 2-methylbutanoic acid:
- 3 hydrogens in the methyl group (CH3) at the 2nd carbon
- 6 hydrogens in the remaining 3 carbons of the main chain (2 CH2 groups and 1 CH group)
- 1 hydrogen in the (S)-stereocenter

2. Propanoic acid:
- 3 hydrogens in the methyl group (CH3) at the end of the chain
- 2 hydrogens in the remaining carbon of the main chain (CH2 group)

Now, when the anhydride bond is formed, we lose one hydrogen atom from each carboxylic acid group. So, subtract 2 hydrogens.

To calculate the total number of hydrogen atoms:
(3+6+1) + (3+2) - 2 = 13 hydrogen atoms

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A cation is an ion with a positive charge that is formed when an atom or molecule loses one or more electrons. The loss of electrons leaves the cation with more protons than electrons, resulting in a net positive charge.

Cations are usually formed by metals or other elements with low electronegativity that have a tendency to lose electrons in chemical reactions. Cations play a vital role in a wide range of biological and chemical processes, such as ion transport across cell membranes, enzyme catalysis, and precipitation reactions. They are also important in the formation of ionic compounds and in electrochemistry, where they can participate in redox reactions

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Methanol burns in oxygen to form carbon dioxide and water.

Part A. The balanced equation for the combustion of methanol is:

2CH3OH(l)+3O2(g)⇌2CO2(g)+4H2O(g)

Part B. The ΔHo rxn at 25 °C can be calculated using the standard enthalpy of formation of the reactants and products: ΔHorxn = ∑ΔHof (products) - ∑ΔHof (reactants)
ΔHorxn = [(2)(-393.5) + (4)(-285.8)] - [(2)(-115.9)] = -890.4 kJ/mol

Part C. The ΔSorxn at 25 °C can be calculated using the standard entropy of formation of the reactants and products: ΔSorxn = ∑ΔSof (products) - ∑ΔSof (reactants)
ΔSorxn = [(2)(213.7) + (4)(188.8)] - [(2)(58.3)] = 590.6 J/molK

Part D. The ΔGorxn at 25 °C can be calculated using the standard Gibbs free energy of formation of the reactants and products: ΔGorxn = ∑ΔGof (products) - ∑ΔGof (reactants)
ΔGorxn = [(2)(-878.7) + (4)(-237.1)] - [(2)(-158.9)] = -1543.3 kJ/mol

Part E. The ΔGorxn at 25 °C is negative, meaning that the combustion of methanol is spontaneous.

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Soil salinization occurs when the soil becomes too high in salt content, which can be harmful to plants. This can happen due to a variety of factors, including irrigation with salty water, natural salt deposits in the soil, or high levels of salt in the air.

One solution to prevent soil salinization is to use irrigation techniques that minimize the amount of salt that is introduced to the soil. For example, drip irrigation and other low-volume irrigation methods can help to reduce the amount of salt that is applied to the soil. Another solution is to use a soil amendment, such as gypsum, to help remove excess salt from the soil.

One disadvantage of using a soil amendment to remediate soil salinization is that it can be expensive to apply. Additionally, it may not be effective in all cases, depending on the specific cause of the soil salinization and the type of soil.

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Maple has a sample of iodine gas. She has 3.20 x 1023 molecules of iodine gas, 5kg is the mass of this sample.

What is mass ?

The basic characteristics of matter include mass. A body's mass is an indicator of how much matter is present there.  A body's mass is constant throughout its whole life. The quantity of gravity pulling on a body is measured by its weight.

What is molecules?

A molecule is a collection of two or more atoms that together make up the smallest unit that may be used to identify a pure substance while still preserving its chemical makeup and physical qualities. There are three different kinds of molecules: atom-sized, element-sized, and compound-sized.

Therefore, maple has a sample of iodine gas. She has 3.20 x 1023 molecules of iodine gas, 5kg is the mass of this sample.

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Given :

Diameter of gold , \(D = 0.506\ mm = 0.0506\ cm\) .

Density , \(d=19.3 \ g/cc\) .

To Find :

How long (in meters) should you cut a piece of wire to obtain 0.0323 moles of gold .

Solution :

Molecular mass of gold , MM =197 g/mole .

Mass of gold :

\(m = n\times MM\\\\m=0.0323\times 197\ g\\\\m=6.3631\ g\)

Volume is given by :

\(V=\dfrac{m}{d}\\\\V=\dfrac{6.3631}{19.3}\ cm^3\\\\V=0.33\ cm^3\)

Now , volume is given by :

\(V=h\pi\dfrac{d^2}{4}\\\\V=h\times \pi \times \dfrac{0.0506^2}{4}\\\\V=h\times 0.002\)

\(h\times 0.002=0.33\\\\h=\dfrac{0.33}{0.002}\ cm\\\\h=165\ cm = 1.65 \ m\)

Therefore , length of wire is 1.65 m .

Hence , this is the required solution .

D) 2.05 g N. The molar mass of N2H4 is 32.045 g/mol. To calculate the mass of N in 2.34 g of N2H4, we need to first calculate the number of moles of N2H4:

moles of N2H4 = (mass of N2H4) / (molar mass of N2H4)
moles of N2H4 = 2.34 g / 32.045 g/mol
moles of N2H4 = 0.073 mol

Since there are two N atoms in one N2H4 molecule, we need to multiply the number of moles of N2H4 by 2 to get the number of moles of N:

moles of N = 2 x moles of N2H4
moles of N = 2 x 0.073 mol
moles of N = 0.146 mol

Finally, we can calculate the mass of N:

mass of N = (moles of N) x (molar mass of N)
mass of N = 0.146 mol x 14.007 g/mol
mass of N = 2.05 g

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Answer: In spring and summer, the uppermost layer of an estuary grows warmer and mixing between this surface water and the cooler bottom water slows. As air temperatures cool through the autumn, the surface water becomes increasingly cold and increases in density.

Explanation:

hope it helps

Answer:

Explanation:

plz mark as brainilist

Answer:

BELOW !!

Explanation:

Chemical energy in food

As the bonds between the atoms in food loosen or break, a chemical reaction takes place, and new compounds are created. The energy produced from this reaction keeps us warm, helps us move, and allows us to grow. Different foods store different amounts of energy.

The electron configuration for a neutral atom of chlorine is 1s² 2s² 2p⁶ 3s² 3p⁵.

Atomic number of Chlorine  is 17. to write the electronic configuration of chlorine we need to know the number of electrons in chlorine atom. the atomic number of chlorine is 17 therefore there are 17 electrons. the first two electron enter in 1s since s can hold only 2 electrons then next two electron will enter in 2s . the next six electrons will enter in 2p since p can hold six electrons . and next two electron in 3s now reaming 5 will enter in 3p. therefore the  electron configuration for a neutral atom of chlorine is 1s² 2s² 2p⁶ 3s² 3p⁵.

Thus, the  electron configuration for a neutral atom of chlorine is 1s² 2s² 2p⁶ 3s² 3p⁵

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Answer:

Different types of hot or cold items can be stored in a thermos and power cannot enter or exit the system when the thermos lid is tightly closed

Explanation:

Closed systems are those that do not interact or do not exchange energy with the environment that surrounds them, that is why internal temperatures and conditions are maintained.

The human body is an open system, that is, it would be the opposite of the thermos since we constantly exchange energy with the environment through sweating, emission of gases, urine, feces, and the ingestion of food.

Thermoses are systems specially created to maintain a medium, it will be maintained if its lid is hermetically closed to prevent heat leakage or entry in situations of cold fluids.

Answer:

The change in entropy is negative; -ΔS

Explanation:

The entropy of a system measures the degree of randomness or energy dispersal of the system. The symbol for entropy is S.

For a given system, the change in entropy is symbolized as ΔS.

For an increase in entropy of a system, the final entropy must be greater than the initial entropy  i.e. Δfinal > Δinitial. Therefore ΔS > 0

For a decrease in entropy of a system, the final entropy must be less than the initial entropy  i.e. Δfinal < Δinitial. Therefore ΔS < 0 or ΔS is negative

A system with decreasing entropy may have a positive or negative free energy change, ΔG.

Also, a system with decreasing entropy may have a positive or negative enthalpy change, ΔH.

A free expansion of an ideal gas occurs when a valve is opened allowing a gas to expand into a bigger container, in such an expansion the temperature of the gas will remain the same.

We need to be able to represent the thermodynamic characteristics of gases as functions of pressure, temperature, and volume in order to construct the theory of thermodynamics. To achieve this, we take into account procedures in which a gas's volume varies. In order for a gas's expansion (or compression) to be a repeatable operation, the heat transfer between the system and its surroundings needs to be managed. There are two simple methods for doing this. When the system is submerged in a bath of constant temperature with a temperature equal to that of the system, or when T=0, we can say that the process is isothermal.

An isothermal process is one in which the system's temperature stays constant throughout the procedure. However, we frequently use the term to simply denote that the process takes place when the system is in thermal contact with surroundings that are at a constant temperature. In theory, the temperature of a gas experiencing a free expansion is not a significant number since the free expansion of a gas is an irreversible process. When we refer to the free expansion of a gas as being isothermal, we mean that the beginning and ultimate temperatures are same.

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No. of moles at STP = Volume at STP (litres) / Molar volume at STP (litres)

The temperature of 273 K and pressure of 1 atmosphere are known as standard temperature and pressure. At STP, one mole of any gas will have a volume of 22.4 L. This volume is known as molar volume of a gas at STP. The formula to find out the number of moles at STP is

No. of moles at STP = Volume at STP (litres) / Molar volume at STP (litres)

Example: How many moles are in 224mL of CO2 at STP?

Standard volume=22.4 L

It means that 1 mole of any atom, molecule or ion occupies 22.4 L of volume at STP (Standard Temperature and Pressure)

1 mole of CO2 = 22.4 L

Given volume = 224 mL = .224 L ( 1 L = 1000 mL)

No. of moles in .224 L = Given volume/Standard volume

= .224/22.4 = 0.01 mole

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The mass percent of acetic acid in vinegar can be calculated by dividing the mass of acetic acid by the total mass of the vinegar solution and multiplying by 100.

To calculate the mass percent of acetic acid in vinegar, you need to determine the mass of acetic acid and the total mass of the vinegar solution. Here are the steps to follow:

1. Obtain the molar mass of acetic acid (CH3COOH), which is approximately 60.05 g/mol.

2. Measure the mass of vinegar used in the calculation.

3. Prepare a known volume of vinegar solution and record the mass of the solution using an analytical balance.

4. Determine the mass of acetic acid in the solution by subtracting the mass of the empty container from the mass of the container with the vinegar solution.

5. Calculate the mass percent of acetic acid by dividing the mass of acetic acid by the total mass of the vinegar solution and multiplying by 100:

  Mass percent of acetic acid = (mass of acetic acid / total mass of vinegar solution) x 100

The resulting value will give you the mass percent of acetic acid in the vinegar solution. It represents the percentage of acetic acid by mass in the total solution.

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