Chem hess’s law

Calculate AH for the reaction: C2H4 (9) + H2 (9) -> CaH6 c) from the following

Answer:

A

Explanation:

just do it

The amount remaining after 18 hours, given that you started with 24 mg and that the sample has a half-life of 4.5 hours, is 1.5 mg

First, we shall obtain the number of half-life that has elapsed in 18 hours. This is shown below:

n = t / t½

n = 18 / 4.5

n = 4

Haven obtained the number of half-lives that has elapsed, we shall determine the amount remaining. Details below:

N = N₀ / 2ⁿ

N = 24 / 2⁴

N = 24 / 16

N = 1.5 mg

Thus, the amount remaining is 1.5 mg

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The interaction of sodium hydroxide (NaOH), hydronium ion (H₃O⁺), and 2-nitropentane. It appears to involve both acid-base reactions and nucleophilic substitution. Here is a theory for the reaction's mechanism:

Step 1: Deprotonation

Strong base NaOH sodium hydroxideinteracts with hydrogen ion H₃O⁺ to produce water (H₂O) and sodium hydronium ion (NaH₃O⁺):

H₃O⁺ + NaOH → H₂O + NaH₃O⁺

Step 2: Nucleophilic Attack

The carbon-nitrogen double bond in NaH₃O⁺ is attacked by the deprotonated nitropentane anion, which is produced from 2-nitropentane, acting as a nucleophile:

NaH₃O⁺ + Nitropentane → Na+ + Nitropentane Anion

Step 3: Protonation

The end product, 2-nitropentanol, is created when water (H₂O), acting as a proton donor, donates a proton to the nitropentane anion:

Nitropentane Anion + H₂O → 2-Nitropentanol

The complete reaction can be summarized as follows:

2-nitropentane + NaOH/H₃O⁺ → 2-nitropentanol + Na⁺ + H₂O

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When designing a scientific question, you should ensure the question is:

A scientific question is an inquiry that scientists examine via methods such as observation, experimentation or data collection leading to an answer.

They often require specific parameters for setting up experiments along with means for measuring outcomes or phenomenon under investigation while also needing testable results to establish validity. As such successful ones must possess traits like precision in defining boundaries within which observations will take place making them measurable so they may produce documented evidence supporting the validity of their findings

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In step 4 of measuring masses of the reactants for Reaction 1, the objective is to determine the mass of each reactant involved in the chemical reaction. This step is crucial for accurately calculating the stoichiometry of the reaction and determining the amount of each reactant needed.

To measure the mass of the reactants, you will typically use a balance or scale that can measure mass with precision. Here's how you can perform this step: Set up the balance: Make sure the balance is clean and calibrated properly. Follow the manufacturer's instructions for any specific procedures or precautions.

Tare the balance: Place an empty container or weighing paper on the balance and press the "tare" or "zero" button to reset the balance to zero. This accounts for the mass of the container, ensuring accurate measurements of the reactants.

Add the reactant: Carefully measure and transfer the desired amount of the first reactant into the container on the balance. Record the mass of the reactant. Repeat for other reactants: If there are multiple reactants in the reaction, repeat the process for each one, recording their individual masses.

Calculate the total mass: Sum up the masses of all the reactants to obtain the total mass of the reactant mixture. It is essential to handle the reactants with care to prevent contamination and accurately measure the masses. Accurate mass measurements are crucial for subsequent calculations, such as determining the mole ratios and performing stoichiometric calculations.

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Answer:

Mass of HCI: 100.50 g

Mass of Solid: 0.20 g

Next answer:

Total mass of reactants: 100.70 g

Explanation:This is the right answer on edge ik cuz im also doing the Lab......Hope this helps!! :D

Approximately 79.05 mL of the 3.00 M HCl solution would be required to react with 25.5 mL of the 4.65 M Ba(OH)2 solution based on the stoichiometry of the balanced chemical equation.

To determine the volume of a 3.00 M hydrochloric acid (HCl) solution required to react with 25.5 mL of a 4.65 M barium hydroxide (Ba(OH)2) solution, we need to use the balanced chemical equation for the reaction between the two compounds:

2HCl + Ba(OH)2 -> BaCl2 + 2H2O

From the equation, we can see that the stoichiometric ratio between HCl and Ba(OH)2 is 2:1. This means that two moles of HCl are required to react with one mole of Ba(OH)2.

First, we need to calculate the number of moles of Ba(OH)2 in 25.5 mL of the 4.65 M solution:

Moles of Ba(OH)2 = Volume (in L) x Concentration (in M)

= 0.0255 L x 4.65 M

= 0.118575 moles

Since the stoichiometric ratio is 2:1, we know that 0.118575 moles of Ba(OH)2 will react with 2 x 0.118575 moles of HCl.

Therefore, the moles of HCl required = 2 x 0.118575 moles = 0.23715 moles

Now we can calculate the volume of the 3.00 M HCl solution containing 0.23715 moles:

Volume (in L) = Moles / Concentration

= 0.23715 moles / 3.00 M

= 0.07905 L

Finally, we convert the volume to milliliters:

Volume (in mL) = 0.07905 L x 1000 mL/L

= 79.05 mL

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To determine the temperature of the air inside the tire when the pressure increases to 87.3 kPa, we can use the ideal gas law equation:

PV = nRT

Where:

P = pressure

V = volume

n = number of moles

R = gas constant

T = temperature

Assuming the volume of the tire remains constant, we can rearrange the equation as follows:

P₁/T₁ = P₂/T₂

Where:

P₁ = initial pressure (82.0 kPa)

T₁ = initial temperature (26.0 °C + 273.15 K) [converting Celsius to Kelvin]

P₂ = final pressure (87.3 kPa)

T₂ = final temperature (unknown)

Substituting the values into the equation:

82.0 kPa / (26.0 °C + 273.15 K) = 87.3 kPa / T₂

Now, let's solve for T₂:

T₂ = (87.3 kPa * (26.0 °C + 273.15 K)) / 82.0 kPa

Calculating the expression:

T₂ ≈ 299.19 K

To convert this temperature back to Celsius:

T₂ ≈ 299.19 K - 273.15 ≈ 26.04 °C

Therefore, the temperature of the air inside the tire, when the pressure increases to 87.3 kPa, is approximately 26.04 °C.

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The amount of energy absorbed by the calorimeter is 5597.92 J. Option A.

Using the formula:

Q = mcΔT

Where Q is the heat absorbed by the calorimeter, m is the mass of the water, c is the specific heat capacity of water, and ΔT is the change in temperature.

Now, let's calculate the heat absorbed by the calorimeter:

Q = (640 g)(4.18 J/g °C)(-2.1 °C)

Q = -5597.92 J

Note that we have a negative value for Q because the calorimeter is absorbing heat from the water mixture.

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The amount of kilocalories of energy Kennith released after blowing up an AMG C 63 is 127 kcal.

To convert from kilojoules to kilocalories, multiply by 0.239. Therefore, the amount of kilocalories of energy released is 530 kJ × 0.239 = 127 kcal.

No, energy cannot be created. Energy can only be converted from one form to another. For example, when you burn a piece of wood, the chemical energy in the wood is converted into heat energy and light energy.

No, energy cannot be destroyed. Energy can only be converted from one form to another. For example, when you turn on a light switch, the electrical energy in the power grid is converted into light energy.

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Answer:1.55x

Explanation: just do it

Answer: b.2

Explanation:

The amount of heat energy absorbed by the cup, given that 50 g of hot water at 72 °C was poured into the styrofoam cup with 50 g of water at 25 °C is 2301.2 J

First, we shall obtain the heat absorbed by the cold water. Details below:

Q = MCΔT

Q = 50 × 4.184 × 18

Q = 3765.6 J

Next, we shall obtain the heat release by the hot water

Q = MCΔT

Q = 50 × 4.184 × -29

Q = -6066.8 J

Note: The negative shows that heat is released.

Finally, we shall obtain the heat absorbed by the cup. Details below:

Heat absorbed by cup = Heat release by hot water - heat absorbed by cold water

Heat absorbed by cup = 6066.8 - 3765.6

Heat absorbed by cup = 2301.2 J

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The equilibrium expression of the reaction is;

[tex]K = [Z] [W]^2/[X]^2 [Y]^3[/tex]

The equilibrium condition for a chemical reaction is represented mathematically by the equilibrium expression. It relates the reactant and product concentrations (or pressures) at equilibrium.

The law of mass action serves as the basis for the equilibrium expression.

From the reaction;

2 X (g) + 3 Y (s) <---> Z (g) + 2 W (g), the equilibrium expression would be;

[tex]K = [Z] [W]^2/[X]^2 [Y]^3[/tex] as derived from the reaction equation shown.

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The mass of 7.8 x 10^22 carbon atoms is 1.553 grams.

To determine the mass of 7.8 x 10^22 carbon atoms, we need to use the concept of molar mass and Avogadro's number.

The molar mass of carbon (C) is approximately 12.01 g/mol, which represents the mass of one mole of carbon atoms. Avogadro's number states that there are 6.022 x 10^23 atoms in one mole of any substance.

Now, let's calculate the mass of 7.8 x 10^22 carbon atoms:

Determine the number of moles:

Number of moles = Number of atoms / Avogadro's number

Number of moles = (7.8 x 10^22) / (6.022 x 10^23) = 0.1295 moles

Calculate the mass:

Mass = Number of moles x Molar mass

Mass = 0.1295 moles x 12.01 g/mol = 1.553 g

Therefore, the mass of 7.8 x 10^22 carbon atoms is approximately 1.553 grams.

The calculation is based on the understanding that the molar mass of carbon represents the mass of one mole of carbon atoms. By dividing the given number of atoms by Avogadro's number, we obtain the number of moles. Multiplying the number of moles by the molar mass gives us the mass in grams.

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The heat capacity of the entire assembly is 4019.4 joules per degree Kelvin.

To calculate the heat capacity of the entire assembly, we need to consider the heat capacities of the metal parts and the oil separately, and then sum them up.

The heat capacity of the metal parts is given as 925.0 J/K. This means that for every 1 degree Kelvin (or Celsius) increase in temperature, the metal parts can absorb or release 925.0 joules of heat.

The oil has a specific heat of 2.814 J/g K. This means that for every 1 gram of oil and 1 degree Kelvin increase in temperature, it can absorb or release 2.814 joules of heat.

Given that there are 1100 grams of oil in the calorimeter, we can calculate the heat capacity of the oil as follows:

Heat capacity of oil = specific heat of oil × mass of oil

= 2.814 J/g K × 1100 g

= 3095.4 J/K

To find the heat capacity of the entire assembly, we sum the heat capacities of the metal parts and the oil:

Heat capacity of entire assembly = heat capacity of metal parts + heat capacity of oil

= 925.0 J/K + 3095.4 J/K

= 4019.4 J/K

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Answer:

The amount of CO₂ produced can be calculated using the mole ratio of CO₂ to C₂H6:

2 mol CO₂ / 1 mol C₂H6 = x mol CO₂ / 1.01 mol C₂H6

x = 2 mol CO₂ / 1 mol C₂H6 × 1.01 mol C₂H6 = 2.02 mol CO₂

Therefore, 2.02 moles of CO₂ were produced.

240.1g is the mass of sodium propanoate. Mass was widely considered to be tied to the amount of matter within a physical body.

A body's mass is an inherent quality. Prior to the discoveries of the atom or particle physics, it was discovered that, despite having the same quantity of matter in theory, various atoms and elementary particles had varied masses. There are several conceptions of mass in contemporary physics that are theoretically different but practically equivalent. The resistance of the body to acceleration (alterations of velocity) in the presence of a net force may be measured experimentally as mass.

pH =Pka + log [salt]/[acid]

4.87=4.87+ log [salt]/[1]

4.87=4.87+ log [salt]/[1]

[salt] = 10 mol dm⁻³

mole = molarity ×volume

mole = 10×0.25

          =2.5

mass = 2.5×96.07

        = 240.1g

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9.7atm

Ideal gas laws let us find different characteristics of gas through its changes.

Boyle's Law

Boyle's law describes the relationship between pressure and volume. This law states that volume and pressure are inversely proportional. This means that as volume increases, pressure decreases. In equation form, Boyle's law is:

In the question, the new volume is greater than the original. This means that the new pressure must be less than the original pressure.

Solving for P₁

In order to find the original pressure, we can plug in the information we know.

Now, divide both sides by 4.0L.

This pressure is greater than 4.3atm, which follows the prediction we made earlier. So, this is a reasonable answer. Since this question involves measured values, we should round according to significant figure rules. This means that the original pressure is 9.7atm.

The missing value for ΔHrxn is -2226 kJ/mol as the enthalpy change that is missing is equal to -498 kJ/mol - 1728 kJ/mol.

Thus, two moles of hydrogen join with one mole of oxygen in the first reaction to create two moles of water. H-H has a 432 kJ/mol bond energy. The energy needed to break these bonds is 4 432 kJ/mol, or 1728 kJ/mol, because there are four moles of H-H bonds broken and two moles of hydrogen.

However, one mole of O=O bonds and four moles of O-H bonds are created, and their combined bond energies are unknown, determined by using the formula ΔHrxn = (energy released in bond creation) - (energy needed in bond breaking). ΔHrxn = -498 kJ/mol, hence the enthalpy change that is missing is equal to -498 kJ/mol - 1728 kJ/mol = -2226 kJ/mol.

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The mole fraction of sodium hydroxide in aqueous solution containing 0.4 g of NaOH (sodium hydroxide)dissolve in 100g of water is approximately 0.0018 .To calculate the mole, one needs to calculate the moles of NaOH and water separately .

Moles of NaOH (sodium hydroxide)= mass of NaOH / molar mass of NaOH

Molar mass of NaOH (sodium hydroxide)= 22.99 g/mol (sodium) + 16.00 g/mol (oxygen) + 1.01 g/mol (hydrogen)

Molar mass of NaOH (sodium hydroxide)= 39.99 g/mol

Moles of NaOH (sodium hydroxide) = 0.4 g / 39.99 g/mol

For water,

Moles of water = mass of water / molar mass of water

Molar mass of water = 18.015 g/mol

Moles of water = 100 g / 18.015 g/mol

Total moles = moles of NaOH (sodium hydroxide)+ moles of water

Mole fraction of NaOH (sodium hydroxide)= moles of NaOH / total moles

Moles of NaOH (sodium hydroxide)= 0.4 g / 39.99 g/mol ≈ 0.010 mol

Moles of water = 100 g / 18.015 g/mol ≈ 5.551 mol

Total moles = 0.010 mol + 5.551 mol ≈ 5.561 mol

Mole fraction of NaOH (sodium hydroxide) = 0.010 mol / 5.561 mol ≈ 0.0018

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Answer:

Orbiter

Explanation:

Space shuttles are made out of three main parts: rocket boosters, a fuel tank, and orbiter (the part that resembles an airplane

The original function f(x) = 1/x becomes g(x) = 1/(x+4) - 3 after the transformation.

The correct transformation function that reflects a shift of 4 units to the left and 3 units down is g(x) = f(x+4) - 3.

This is because, in function notation, adding to the input value inside the function (x+4) shifts the function to the left, while subtracting from the output of the function (-3) shifts it down.

So, the original function f(x) = 1/x becomes g(x) = 1/(x+4) - 3 after the transformation.

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The approximate number of molecules in the given set of values is 2.823 × 10²² molecules of CO₂.To calculate the number of molecules (n) of CO₂, we can use the ideal gas law equation:PV = nRT

Where:

P = Pressure (in kPa)

V = Volume (in liters)

n = Number of moles

R = Ideal gas constant (8.314 J/(mol·K))

T = Temperature (in Kelvin),First, let's convert the pressure from kPa to atm (atmospheres) since the ideal gas constant is usually expressed in atm:

1 atm = 101.325 kPa

So, 200 kPa is approximately 1.973 atm.

Now, rearranging the ideal gas law equation to solve for n:

n = (PV) / (RT)

n = (1.973 atm * 0.602 L) / (0.0821 L·atm/(mol·K) * 311 K)

n ≈ 0.0469 mol

Since 1 mole of any substance contains Avogadro's number (6.022 × 10²³) of molecules, the number of molecules (N) can be calculated by multiplying the number of moles by Avogadro's number:

N = n * Avogadro's number

N = 0.0469 mol * (6.022 × 10²³ molecules/mol)

=N ≈ 2.823 × 10²² molecules

Therefore, the approximate number of molecules in the given set of values is 2.823 × 10²² molecules of CO₂.

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The homologous series that CH₂CH₂ CH₂CH₂ belongs to is alkene.

Homologous series is any series of aliphatic organic compounds whose members differ only in the addition of a CH₂ group.

The members of the homologous series are as follows;

Alkene is an unsaturated, aliphatic hydrocarbon with one or more carbon–carbon double bonds.

According to this question, the above given compound is butene (a member of alkene) because it has four carbon atoms and 8 hydrogen atoms.

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The limiting reactant of the reaction is CH₄.

The molar composition of the product stream is:

The limiting reactant is determined using the stoichiometric ratios of methane (CH₄) and oxygen (O₂) in the given feed composition.

The balanced equation is:

CH₄ + 2 O₂ ----> CO₂ + 2 H₂O

From the feed composition, we have:

CH₄: 20 mole %

O₂: 60 mole %

CO₂: 20 mole %

Assuming a total feed of 100 moles.

Moles of CH₄ in the feed = 20% of 100 moles = 20 moles

Moles of O2 in the feed = 60% of 100 moles = 60 moles

Based on the balanced equation, the stoichiometric ratio is 1:2 between CH₄ and O₂.

Since we have 20 moles of CH₄ and 60 moles of O₂, we can see that there is an excess of O₂. Therefore, the limiting reactant is CH₄.

The molar composition of the product stream:

Since CH₄ is the limiting reactant, we will determine the amount of carbon dioxide (CO₂) and water (H₂O) produced based on the 90% conversion rate of CH₄.

From the balanced equation, for every mole of CH₄ reacted, we obtain one mole of CO2 and two moles of H₂O.

Moles of CO₂ produced = 90% of 20 moles = 0.9 * 20 = 18 moles

Moles of H₂O produced = 2 * (90% of 20 moles) = 2 * (0.9 * 20) = 36 moles

Total moles of products = Moles of CO2 + Moles of H2O

Total moles of products = 18 moles + 36 moles

Total moles of products = 54 moles

Therefore;

Moles of CO₂ in the product stream = 18 moles / 54 moles * 100% = 33.33%

Moles of H₂O in the product stream = 36 moles / 54 moles * 100% = 66.67%

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The cellular process described by the chemical equation 6O2 + C6H12O6 → 6CO2 + 6H2O + energy is cellular respiration.

Option B.

Cellular respiration is a set of metabolic reactions and processes that occur in cells to convert biochemical energy derived from nutrients into adenosine triphosphate (ATP) energy, and then release waste products. It is the method by which the cells of an organism derive energy through the consumption of glucose and oxygen. During cellular respiration, glucose and oxygen are converted into carbon dioxide, water, and ATP molecules. This process occurs in three main stages, including glycolysis, the Krebs cycle, and the electron transport chain.
Glycolysis: This is the first stage of cellular respiration that occurs in the cytoplasm of cells. In glycolysis, glucose is broken down into two pyruvic acid molecules, which produces two ATP molecules. This stage of cellular respiration is anaerobic, meaning it does not require oxygen.
Krebs cycle: Also known as the citric acid cycle, the Krebs cycle is the second stage of cellular respiration. It occurs in the mitochondria of cells and involves the conversion of pyruvic acid into carbon dioxide. The Krebs cycle produces several high-energy molecules, including ATP, NADH, and FADH2.
Electron transport chain: The electron transport chain is the final stage of cellular respiration that occurs in the mitochondria. During this stage, the high-energy molecules produced in the Krebs cycle are used to generate ATP through a process known as oxidative phosphorylation. This stage of cellular respiration requires oxygen and produces a significant amount of ATP.
In conclusion, the chemical equation 6O2 + C6H12O6 → 6CO2 + 6H2O + energy represents cellular respiration, which is the process by which cells derive energy from glucose and oxygen to produce ATP.

Option B.

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Answer:

B - cellular respiration

Explanation:

did the test.

Mercury and bromine are two elements that are liquid at room temperature.​

The key difference between bromine and mercury is that bromine is the only halogen that is in a liquid state at room temperature, whereas mercury is the only metal that is in a liquid state at room temperature. Both bromine and mercury can be found in their liquid state at standard temperature and pressure conditions. However, bromine is a nonmetal while mercury is a metal.

Bromine, in its elemental form, is very reactive; therefore, we cannot observe this element as a free element in nature. However, we can find it as a colorless soluble crystalline mineral halide salt form which is analogous to table salt. On a commercial scale, we can easily extract bromine from brine pools.

Mercury can be observed as a heavy liquid metal that has a poor conductivity of electricity compared to other metals. However, solid mercury is malleable and ductile and can be cut with a knife. This chemical element does not react with most acids such as dilute sulfuric acid, but some oxidizing acids such as concentrated sulfuric acid and nitric acid, aqua regia can dissolve this metal to give sulfate, nitrate, and chloride forms of mercury. Moreover, mercury can dissolve many metals such as gold and silver, forming amalgams.

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The specific characteristics of the layers that make up the Earth's atmosphere affect the types of wavelengths that are reflected. Troposphere, stratosphere, and mesosphere are the three layers.

The stratosphere, which contains the ozone layer, is the next layer. The sun's dangerous UV light is absorbed by ozone, keeping it from reaching the surface of the Earth. Visible light and some infrared radiation can travel through this layer.

The mesosphere is located above the stratosphere, where the majority of meteoroids burn up as they enter the atmosphere of the Earth.

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