The evaporation heat of mercury is 296 kJ/ kg. Calculate how much heat needs to be provided to change 50 g of this substance into vapour at its boiling point

The first thing to do is to calculate the number of moles in the given molecules. For this, we use the Avogadro number which tells us that one mole of any substance contains 6.022x10^23 molecules.

We clear x,

Now we will use the molar weight of chlorine to determine the mass in 0.46 moles.

Molar weight of chlorine = 35.453 g/mol

So, the mass in 2.75x10^26 molecules of Chlorine is 16.20g

1.85 liters of oxygen gas will react with 2.50 liters of NO gas at 320 K and 680 torr.

Given:

T = 320 K

Convert the pressure of 680 torrs to atm by dividing by 760 (since 1 atm = 760 torrs):

P = 680 torr / 760 torr/atm

= 0.8947 atm

For NO gas:

P(NO) = 0.8947 atm

V(NO) = 2.50 L

T = 320 K

R = 0.0821 L·atm/(mol·K)

Use the ideal gas law equation:

PV = nRT

Where:

P = pressure (in atm)

V = volume (in liters)

n = number of moles

R = ideal gas constant (0.0821 L·atm/(mol·K))

T = temperature (in Kelvin)

Rearrange the ideal gas law equation to solve for the number of moles:

n = PV / RT

n(NO) = (0.8947 atm × 2.50 L) / (0.0821 L·atm/(mol·K) × 320 K)

n(NO) = 0.1074 mol

According to the balanced chemical equation, the stoichiometric ratio between NO and O₂ is 2:1. Therefore, the number of moles of oxygen required will be half of the moles of NO gas:

n(O₂) = 0.1074 mol / 2

n(O₂) = 0.0537 mol

P(O₂) = 0.8947 atm

T = 320 K

R = 0.0821 L·atm/(mol·K)

n(O₂) = 0.0537 mol

V(O₂) = (n(O₂) R T) / P(O₂)

V(O₂) = (0.0537 mol × 0.0821 L·atm/(mol·K) × 320 K) / 0.8947 atm

V(O₂) = 1.85 L

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A system's equilibrium will move to the right, or toward the side of the products, in accordance with Le Chatelier's principle, if more reactants are added. ... The equilibrium will move to the left if we add more product to a system, producing more reactants.

Solution: By increasing the number of reactants, the equilibrium moves to the right and in the direction of the products.

Thus, if a reactant is added, equilibrium shifts to the right, away from the reactant. Equilibrium shifts to the left, away from the product, when a product is added. If we take away the product, equilibrium returns and produces the product. Reactant is created if reactant is removed, breaking the equilibrium.

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When comparing gases with equal mass at a given temperature and pressure, the volume occupied by the gases can be compared using the ideal gas law.

However, since the temperature and pressure are not specified, we cannot directly determine the volumes. Nevertheless, we can make an inference based on the molecular properties of the gases.

In terms of molecular size, larger molecules tend to occupy more volume compared to smaller molecules. Therefore, we can arrange the gases from the largest to the smallest volume based on their molecular sizes:

Largest volume: **CH4** (methane)

Next largest volume: **S2** (disulfur)

Intermediate volume: **Cl2** (chlorine)

Smaller volume: **N2** (nitrogen)

Smallest volume: **F2** (fluorine)

This ordering is based on the assumption that CH4 (methane) has the largest molecular size among the given gases, followed by S2 (disulfur), Cl2 (chlorine), N2 (nitrogen), and F2 (fluorine), with the latter having the smallest molecular size. Therefore, this arrangement represents the relative volumes of the gases from largest to smallest, based on molecular size.

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A unit of measurement is a definite magnitude of a quantity, defined and adopted by convention or by law, that is used as a standard for measurement of the same kind of quantity. Any other quantity of that kind can be expressed as a multiple of the unit of measurement. For example, a length is a physical quantity.

Answer: increasing number of protons increases the positive charge of the nucleus.

Explanation: because as the electronegativity moves from left to right on the periodic table the protons do increase to make it into a positive charge.

Answer:

NO 2200! 800 proprobably

Explanation:

just did wrong

Answer:

800 kJ

Explanation:

Answer:

Rubidium Chloride is an excellent water soluble crystalline Rubidium source for uses compatible with chlorides.

Compound Formula: ClRb

Melting Point: 715 °C

Boiling Point: 1,390 °C

Explanation:

Answer:

Can you explain your question I don't understand

The statement "forging is a deformation process in which the work is compressed between two dies, using either impact or gradual pressure to form the part" is true.

Forging is a manufacturing process that involves shaping metal by applying compressive forces to it. The process begins with the metal being heated to a suitable temperature so that it is easier to work with, then it is compressed between two dies or tools, which apply either impact or gradual pressure to the metal.

This process is called forging, and it can be used to create a wide range of metal components, from simple shapes like nails and bolts to complex ones like gears and turbines.

There are several different types of forging, including open die forging, closed die forging, and impression-die forging, each of which uses a different technique to deform the metal. In open die forging, the metal is compressed between two flat dies, while in closed die forging, the dies are shaped to create a specific part.

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When 4 moles of O2 are reacted, 1980 kJ of heat will be absorbed.

In order to determine how many kJ of heat will be absorbed, need to know the reaction and its corresponding enthalpy change (ΔH).

Let's assume that the reaction being referred to is the combustion of oxygen:

2O2(g) + energy → 2O(g)

The enthalpy change for this reaction is -495 kJ/mol, which means that 495 kJ of heat is released when one mole of oxygen is burned.

Since we have 4 moles of oxygen being reacted, the total amount of heat absorbed can be calculated as:

(495 kJ/mol) x (4 mol) = 1980 kJ

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Answer:

Hi

Please mark brainliest ❣️

Thanks

Explanation:

Correct answer is D

Energy A

Look at this

Energy required to break bonds that is intermolecular forces

Answer:

P = 9800 Pa

Explanation:

Given that,

The mass of a box, m = 30 kg

Length of the box, l = 0.2 m

The width of a box, b = 0.15 m

We need to find the pressure it exerted on the floor. Pressure is equal to force acting per unit area. So,

\(P=\dfrac{F}{A}\\\\=\dfrac{mg}{lb}\\\\=\dfrac{30\times 9.8}{0.2\times 0.15}\\\\P=9800\ Pa\)

So, 9800 Pa of pressure is exerted on the floor.

Two form of isomer shown by Alanine amino acid is

                 a) L- alanine

                 b) D- alanine

Type of isomerism shown is Stereoisomers.

Amino acids are molecules that combine to form proteins. Amino acids and proteins are the constructing blocks of life. When proteins are digested or broken down, amino acids are left. The human body uses amino acids to make proteins to assist the body.

Amino acids are required for the synthesis of body protein and other important nitrogen-containing compounds, which include creatine, peptide hormones, and some neurotransmitters. Despite the fact that allowances are expressed as protein, a the organic requirement is for amino acids.

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Wavelength (L) is calculated using: L = gT²/2π, here g=9.8 m/s2 and T is wave period in seconds.

Wavelength of a wave describes how long the wave is and the distance from the "crest" (top) of one wave to the crest of next wave is called wavelength. We can also measure from the "trough" (bottom) of one wave to trough of next wave and get the same value for the wavelength.

We measure wavelength in following ways:

Use photometer to measure the energy of wave.

Convert energy into joules (J).

Divide energy by Planck's constant, 6.626 x 10⁻³⁴, to get the frequency of  wave.

Divide speed of light, ~300,000,000 m/s, by frequency to get wavelength.

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Answer:

20

step by step explanation:

Wine was produced 37 years ago (1984 as usual year 15,2021) that is shown in the calculations below.

Reaction rate is calculated using the formula rate = Δ[C]/Δt, where Δ[C] is the change in product concentration during time period Δt. The rate of reaction can be observed by watching the disappearance of a reactant or the appearance of a product over time.

The time can be represented as follows:

t= 2.303\∧ log A0/A

∧= 0.693/t 1/2

The rate of a reaction is proportional to the reciprocal of the time taken. Rate α 1 time Rate is inversely proportional to time. Units: s-1, min-1 etc.

The given parameters are as follows:

t1/2=12.3

A0=5.5

A=0.688

t= 2.303/(0.693/12.3) log (5.5/0.688)

t=36.9

t=37 years

Thus, wine was produced 37 years ago (1984 as usual year 15,2021)

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The plasma pencil is a device that generates non-thermal plasma, and its operation typically involves a high-frequency voltage source.

The period of a voltage source refers to the time it takes for one complete cycle of its output waveform.The exact period of the voltage source for a plasma pencil can vary depending on its design and application. To determine the period, you would need to know the frequency of the voltage source (f). You can calculate the period (T) using the formula:

T = 1/f

Where T is the period, and f is the frequency of the voltage source in Hertz (Hz).

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The period of a voltage source for a plasma pencil depends on its operating frequency, the period being the inverse of the frequency. The time taken for one complete cycle signifies the period.

The period of a voltage source that operates the plasma pencil would depend on the frequency at which the voltage source is operating. The period (T) is the reciprocal of the frequency (f), given by the formula T = 1 / f. Therefore, if we know the frequency at which the voltage source is operating, we can find the period. For instance, if our voltage source operates at a frequency of 100 Hz, our period would be 1/100 or 0.01 seconds, which means our voltage source completes one full cycle every 0.01 seconds.

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The value of q when the solution contains 2.00×10⁻² M Sr₂ and 1.50×10⁻³ M CrO₄²⁻ is 0.135.

To answer this question, we need to use the solubility product constant (Ksp) expression for the reaction between strontium ions (Sr₂⁺) and chromate ions (CrO₄²⁻):

Ksp = [Sr₂⁺][CrO₄²⁻]

We are given the concentrations of Sr₂⁺ and CrO₄²⁻ in the solution, so we can plug them into the expression and solve for Ksp:

Ksp = (2.00 × 10⁻²)(1.50 × 10⁻³)

= 3.00 × 10⁻⁵

Now we need to use the Ksp expression to find the concentration of the common ion, which in this case is the strontium ion (Sr₂⁺). To do this, we assume that all of the Sr₂⁺ and CrO₄²⁻ ions in the solution react to form a solid precipitate, so the amount of Sr₂⁺ that precipitates out of solution is equal to the amount of CrO₄²⁻ that precipitates out. Let x be the molar solubility of SrCrO₄ (the solid precipitate) in the solution. Then:

Ksp = [Sr₂⁺][CrO₄²⁻] = x*x = x²

Solving for x, we get:

x = √(Ksp)

= √(3.00 × 10⁻⁵)

= 1.73 × 10⁻²

Therefore, the concentration of Sr₂⁺ in the solution is also 1.73 × 10⁻² M (since all of it precipitates out). Finally, we can use the concentration of Sr₂⁺ and the initial concentration of Sr²⁺ to find the fraction that has precipitated out:

q = (initial concentration of Sr₂⁺ - concentration of Sr₂⁺ in solution) / initial concentration of Sr₂⁺

q = (2.00×10⁻² - 1.73×10⁻²) / 2.00×10⁻²

= 0.135

Therefore, the value of q is 0.135.

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Answer:

the outcome of something

Answer:

Protons

Explanation:

That would be protons, who have a positive charge to an electron’s negative charge. Their attraction is what keeps an electron inside the atom.

Explanation:

yup you are right. The answer is 2,3- Dimethyl butane

Half life, as stated, is a measurement of the rate at which radioactive material decays.

This process can be artificially produced by people, such as within a nuclear reactor, but can also occur spontaneously in nature. Depending on the particles or energy generated during the reaction, there are many kinds of radioactivity. Alpha particles, beta particles, and gamma rays are the three categories.

Average and half-life are two characteristics that may be used to describe the decay constant. Moments are used as the measuring unit in both scenarios. The average lifespan of such an element, as indicated by its name, may be expressed in the form of the following affirmation:

Nt=N₀ * e^(−λt).

The duration of time that is defined by how long it takes for half of a material to degrade is known as its half-life (both radioactive and non-radioactive elements). All through process of decay, its rate of decay is constant. It may be seen by:

Nt=N₀* (1/2)^(t/t₁₂).

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Matter are anything that is made up of atoms. The quantity of matter can be observed only on the basis of mass and volume calculation. Therefore, the correct option is option A.

Matter is a substance that has some mass and can occupy some volume. The matter is mainly used in science. Matter can be solid, liquid or gas.

Matter is anything that is made up of atoms. Anything around us that can be physically seen and touched are matter. Ice, water and water vapors are example of matter.

So as we saw that matter has some mass so mass can be measured in gram only. Mass can also be represented as number of molecules. We also saw that matter occupy some volume and that volume is measured only in liter.  l nm = 1.0 × 10⁻⁶ fm

540 nanometers =  540 × 1.0 × 10⁻⁶ fm

                             =  5.40 x 10⁻⁴fm

Therefore, the correct option is option A.

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Answer:

0.9

Explanation:

used a calculator that calculates that

I put 1 star by accident lol, but it was 0.93933052035153 if you want to be exact I just rounded it

Answer:

eyes hair skin

Explanation:

eyes you can get from parents skin and hair

The corresponding molar concentration of phosphate (PO₄³⁻) in seawater, given a phosphorus concentration of 0.07 ppm by mass, is approximately 2.26 μM (micromolar).

How to calculate the molar concentration?

To calculate the molar concentration of phosphate in seawater, we first need to convert the phosphorus concentration from ppm (parts per million) to molar concentration.

1. Convert ppm to mass fraction:

ppm is a unit of mass concentration, representing parts per million. To convert it to a mass fraction, we divide by 1 million.

Mass fraction of phosphorus = 0.07 ppm / 1,000,000 = 7 x 10⁻⁸

2. Convert mass fraction to molar concentration:

To convert the mass fraction of phosphorus to molar concentration of phosphate, we need to consider the molar mass of phosphorus and the molar mass of phosphate.

The molar mass of phosphorus (P) is 30.97 g/mol, and the molar mass of phosphate (PO₄³⁻) is 94.97 g/mol.

Moles of phosphorus = Mass fraction of phosphorus / Molar mass of phosphorus = 7 x 10⁻⁸ / 30.97 g/mol

Molar concentration of phosphate = Moles of phosphorus / Molar mass of phosphate = (7 x 10⁻⁸ / 30.97 g/mol) / 94.97 g/mol

Molar concentration of phosphate ≈ 2.26 x 10⁻⁶ mol/L = 2.26 μM

Therefore, the corresponding molar concentration of phosphate in seawater, given a phosphorus concentration of 0.07 ppm by mass, is approximately 2.26 μM.

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