Which of the following are always true for a spontaneous reaction? [Select all that apply] AGrxn is negative ASrxn is positive 0 Ecell is positive

Answer:c

Explanation: can someone help me to see if this is true

Answer:

.079 moles of Nirogen gas (N2)

Explanation:

You can see from the equaton that each ONE mole of N2 produces TWO moles of NH3.

 Find the number of moles of NH3 produced.

    Using Periodic Table : Mole wt of NH3 = 17 gm/mole

          2.7 gm / 17 gm/mole = .1588 moles

      One half as many moles of N2 are needed  = .079 moles

A gas made from carbon and hydrogen has a density of 1. 16g/L at STP, the molar mass will be 25.984 g/mole

The standard temperature and pressure are referred to as the STP conditions. As reference values for gases, pressure values at 1 atmosphere and temperature at 0°C are utilized. And under these circumstances, a mole of any gas takes up around 22.4 liters of space.

The mass that is present per unit volume of a substance is known as its density. You understand that 1. 16 g/L indicates that this gas has a mass of 1. 16 g per liter.

Given that one mole of gas at STP takes up 22.4 litres, you can state that the mass of one mole of this gas will be:

22.4 L× 1. 16 = 25.984 g

Finally, the molar mass of this gas is 25.984 g/mole if 1 mole of it weighs 25.984 g.

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To prepare a buffer solution by the reaction of a weak base with a strong acid, the weak base must be the limiting reactant.

A buffer solution is a solution that has the capacity to keep the pH of a solution relatively constant despite the addition of other substances that typically affect the pH of the solution. A buffer solution is made up of a weak acid and its corresponding conjugate base or a weak base and its corresponding conjugate acid. The solution can be prepared by reacting a weak acid with its corresponding conjugate base or by reacting a weak base with its corresponding conjugate acid.

To prepare a buffer solution by the reaction of a weak base with a strong acid, the weak base must be the limiting reactant. When the weak base reacts with the strong acid, it produces salt and water. The salt formed will be the conjugate acid of the weak base. The resulting solution will contain both the weak base and its conjugate acid, which act as a buffer solution. Hence, the limiting reactant in preparing a buffer solution by the reaction of a weak base with a strong acid is the weak base.

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The mass of NaCl generated is calculated as 85%/100% * 29.225 g = 24.84 g NaCl.

what is the balanced equation of the nacl ?

Let us begin by constructing a suitably balanced equation:

2Na (s) + Cl2(g) (s)

1 mol Na yields 1 mol NaCl

Molecular weight 23 g/mol Na

11.5 g Mol Na = 11.5 g / 23 g / mol = 0.5 mol Na

This will provide 0.5 mol NaCl.

NaCl molar mass = 23 + 35.45 = 58.45 g/mol

At 100% production, the mass of 0.5 mol NaCl = 0.5 mol * 58.45 g/mol = 29.225 g.

If the true yield is 85%, then:

The mass of NaCl generated is calculated as 85%/100% * 29.225 g = 24.84 g NaCl.

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Answer:

D, They produce fossil fuels

Explanation:

you can't just pull them out of nowhere

Answer:

When hydrochloric acid comes into contact with calcium carbonate, the following chemical reaction ensues: CaCO3 + 2HCl → CaCl + CO2 + H2O, which provides acid neutralization alongside the formation of byproducts

Answer:

C) liquid

Explanation:

edge 2023

Answer:

Base

Explanation:

Why is Alka-Seltzer a base?

Alka-Seltzer contains sodium bicarbonate and citric acid. The sodium citrate acts as an antacid. Excess sodium bicarbonate from the Alka-Seltzer acts to neutralize base.

The maximum amount of NADPH that can be produced from 2 glucose molecules is 12. In glycolysis, one molecule of glucose is converted into two molecules of pyruvate.

This process generates two molecules of NADH. Each NADH molecule can then be converted into NADPH through the action of the enzyme NADP+-dependent dehydrogenase.

Therefore, from one glucose molecule, we can produce 2 NADPH molecules. Since we start with 2 glucose molecules, we can double this amount. Thus, the maximum amount of NADPH that can be produced from 2 glucose molecules is 2 x 2 = 4 NADPH molecules.

In addition to glycolysis, glucose can also enter the pentose phosphate pathway (PPP) where it is converted into ribose-5-phosphate and NADPH. In the oxidative phase of the PPP, each glucose molecule generates 2 NADPH molecules. Therefore, from 2 glucose molecules, the PPP can produce an additional 2 x 2 = 4 NADPH molecules.

Adding up the NADPH produced from both glycolysis and the PPP, we have a total of 4 NADPH + 4 NADPH = 8 NADPH molecules.

Therefore, the correct answer is b) 12, as we can produce a maximum of 12 NADPH molecules from 2 glucose molecules through the combined actions of glycolysis and the pentose phosphate pathway.

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Answer:

For any given element, ionization energy increases as subsequent electrons are removed. For example, the energy required to remove an electron from neutral chlorine is 1251 kJ/mol. ... An even sharper increase in ionization energy is witnessed when inner-shell, or core, electrons are removed.

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peat is the name for the partly decayed plant material that accumulates in marshes and bogs.

Peat also known as turf is utilized as a flavoring agent during the kilning of barley, not as a heat source. The location of the peat and its manner of utilization have a significant impact on the flavor of the alcohol produced. The peat is burnt without igniting during the kilning process, producing a smoke known as peat reek. It is burnt early in the kilning process so that the combustion products adhere to and are absorbed by the malt.

Fibric peats have the least decomposition and are made up of intact fiber. Hemic peats are partially degraded, whereas sapric peats are completely decomposed. Phragmites peat is made up of reed grass, Phragmites australis, and other grasses. It has a higher density than most other forms of peat.

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200 mL of 0.10 M BaCl2 contains 0.02 moles of BaCl2.

An insoluble, white precipitate of BaSO4 is created by the interaction of Na2SO4 with BaCl2 in water. This suggests that the reaction is a twofold displacement one. since the reactants' chemical characteristics and composition are different from those of the products generated. It is therefore a chemical alteration. It's called a "twofold displacement reaction" when one reactant is only partially replaced by another.

moles = concentration x volume (in liters)

Converting 200 mL to liters:

200 mL equals to 200/1000 L = 0.2 L

Using the formula:

moles of BaCl₂ = 0.10 M x 0.2 L = 0.02 moles

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Answer:

0.02 moles is the correct answer

Explanation:

The term used to denote the concentration of electrolytes in a given volume is "molarity".

Molarity-

Molarity is the number of moles of solute dissolved in one liter of the solution. Molarity is the most widely used concentration metric in chemistry, and it is frequently denoted by "M." It denotes the amount of solute in moles per liter of solution.

A solution's molarity can be calculated using the following formula:

Molarity = moles of solute / liters of solution

Molarity is often used to express the concentration of a solution's electrolytes because electrolytes break into ions when dissolved in a solvent, allowing for electrical conductivity.

Molarity can be used in other applications, such as stoichiometry, which involves determining how much of one compound is required to react completely with another.

Molarity is a useful tool for solving problems that involve chemical reactions since the number of moles of a substance is frequently used to establish reaction ratios, limit reactants, and determine the theoretical yield.

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The Number of Moles of Zn is 0.34108 and the number of moles of Cr2O3 is 0.14671.

What is Number of Moles?

The ratio of a substance's given mass in a chemical reaction to the mass of one mole of that material is what determines how many moles there are of that substance. A mole of any substance is equal to 6.0231023, or Avogadro's number. The ratio of a substance's given mass in any kind of chemical reaction to the mass of one mole of that material is the number of moles of that substance.

Moles of Zn can be calculated by using the formula

22.3 g of Zn x 1 mole Zn/65.4 g = 0.341 moles of Zn.

Moles of Cr2O3 can be calculated by using the formula

22.3 g of Cr2O3 x 1 mole Cr2O3/151.99 = 0.146 moles of Cr2O3.

Hence, 0.34108 and 0.14671 will be the number of moles for Zn adn Cr2O3 respectively.

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Zn has a mole count of 0.34108, while Cr2O3 has a mole count of 0.14671.

What is Number of Moles?
The number of moles of a substance is determined by the ratio of its given mass in a chemical reaction towards the mass of one mole of that substance. A mole, or 6.0231023, is equal to one mole of any substance. The number of moles of a substance is defined as the mass of one mole divided by the given mass of the substance in any type of chemical reaction.

The formula can be used to determine moles of zinc.
22.3 g of Zn x 1 mole Zn/65.4 g = 0.341 moles of Zn.

The formula can be used to determine moles of Cr2O3.
22.3 g of Cr2O3 x 1 mole Cr2O3/151.99 = 0.146 moles of Cr2O3.

Therefore, the moles of Zn and Cr2O3 will be 0.34108 and 0.14671, respectively.

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A12.0-g sample of carbon from living matter decays at the rate of 184 decays/minute due to the radioactive C in it. the decay rate of this sample in

(a) 1000 years  = 143.8 decays/min

(b) 50,000 years = 0.43 decays/min

a) the expression is given as :

0.693 / t1/2 = 2.303 / t log(Ao / A)

t1/2 , radioactive decay half-life for C-14 = 5670 years

0.693 / 5670 = 2.303 / 1000 ( log 184 / A)

A = 143.8 decays / min

b) 0.693 / t1/2 = 2.303 / t log(Ao / A)

0.693 / 5670 = 2.303 / 50000 log( 184/ A)

A = 0.43 decays / min

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The cross-sectional area of the solenoid is approximately 2.84 × 10\-4 m\2. To find the cross-sectional area of the solenoid, we need to follow these steps:

1. Calculate the total number of turns in the solenoid.
2. Determine the inductance of the solenoid.
3. Calculate the cross-sectional area using the formula for the inductance of a solenoid.

Step 1: Calculate the total number of turns in the solenoid.
Total turns (N) = turns per meter (n) * length (L)
N = 450 turns/m * 1.8 m
N = 810 turns

Step 2: Determine the inductance of the solenoid.
The energy stored in the solenoid (W) can be calculated using the formula:
W = 0.5 * L * I\2
where L is the inductance and I is the current.

Rearrange the formula to find the inductance:
L = 2 * W / I^2
L = 2 * 0.39 J / (12 A)\2
L = 0.078 H (henry)

Step 3: Calculate the cross-sectional area using the formula for the inductance of a solenoid.
The inductance of a solenoid can be calculated using the formula:
L = μ₀ * N\2 * A / L
where μ₀ is the permeability of free space (4π × 10\-7 T·m/A), A is the cross-sectional area, and L is the length.

Rearrange the formula to find the cross-sectional area:
A = L * L / (μ₀ * N\2)
A = 0.078 H * 1.8 m / (4π × 10\-7 T·m/A * (810 turns)\2)
A ≈ 2.84 × 10\-4 m^2

The cross-sectional area of the solenoid is approximately 2.84 × 10\-4 m\2.

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In thin layer chromatography (TLC), the stationary phase is a thin, non-porous layer of a solid material and the mobile phase is a liquid. In column chromatography, the stationary phase is a solid material packed into a tube and the mobile phase is a liquid.

Thin layer chromatography (TLC) and column chromatography differ in their stationary and mobile phases. TLC and column chromatography differ in their stationary and mobile phases.

Both techniques can be used to identify compounds by comparing their retention times to those of known compounds. However, TLC is faster and more cost-effective than column chromatography, whereas column chromatography has higher resolution and can handle larger sample volumes.

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Answer:

Certain things we think of as hard work, such as writing an exam or carrying a heavy load on level ground, are not work as defined by a scientist. The scientific definition of work reveals its relationship to energy—whenever work is done, energy is transferred.

For work, in the scientific sense, to be done, a force must be exerted and there must be motion or displacement in the direction of the force.

Answer:

Heat flows from the block at high temperature to the one with lower temperature

Explanation:

The direction of heat flow is from a body at higher temperature to one with a lower temperature.

Answer:

the answer options C

170 C no heat flow

Explanation:

Answer:

CuI

Explanation:

Cu2+ + 2I− → CuI + 0.5 I2

Answer:

CuI2

Explanation:

valency of copper(II) is 2 and iodine is 1

The most likely cause of earthquakes that occur in the area shown on the map is due to fault lines in the earth's crust.

Earthquakes are natural phenomena characterized by the shaking or trembling of the Earth's surface.

They occur due to the sudden release of energy in the Earth's crust along fault lines, which creates seismic waves that propagate through the Earth.

The Earth's crust is composed of several large tectonic plates that float on the semi-fluid layer of the Earth's mantle.

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The concentration of arsenic in the ground water sample is approximately 29.6 ppm.To calculate the concentration of arsenic in parts per million (ppm), we need to divide the mass of arsenic by the mass of the sample and multiply by 1,000,000.

Given:

Mass of arsenic = 0.0548 g

Mass of sample = 1853 g

Concentration of arsenic (ppm) = (0.0548 g / 1853 g) * 1,000,000 = 29.6 ppm

Therefore, the concentration of arsenic in the ground water sample is approximately 29.6 ppm.

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Option D is the correct alternative.

We have a chemically unreactive element.

We have to determine which term best describes this atom.

Reactivity in chemistry is the impulse for which a chemical substance undergoes a chemical reaction, either by itself or with other materials.

According to the question -

An atom that that does not react with the other atoms belongs to those elements which are chemically unreactive or inert elements. The reason behind their inertness is their completely filled outermost shell which can accommodate a maximum of 8 electrons which is as shown by their electronic configuration -  1s²2s²2p⁶. Hence, they are highly stable and don't react with other elements. Ex - Helium, Argon, Neon etc.

Hence, Option D is the correct alternative.

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Answer:

A-Ideas

Explanation: