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Answer: \(K_{eq}\) at  the temperature of the experiment is 0.56.

Explanation:

Moles of  \(CO\) = 0.35 mole

Moles of  \(H_2O\) = 0.40 mole

Volume of solution = 1.00 L

Initial concentration of \(CO\) = \(\frac{0.35mol}{1.00L}=0.35M\)

Initial concentration of \(H_2O\) = \(\frac{0.40mol}{1.00L}=0.40M\)

Equilibrium concentration of \(CO\) = \(\frac{0.19mol}{1.00L}=0.19M\)

The given balanced equilibrium reaction is,

                      \(CO(g)+H_2O(g)\rightleftharpoons CO_2(g)+H_2(g)\)

Initial conc.          0.35 M         0.40 M                  0 M        0M

    At eqm. conc.     (0.35-x) M   (0.40-x) M   (x) M      (x) M

Given:  (0.35-x) = 0.19

x= 0.16 M

The expression for equilibrium constant for this reaction will be,

\(K_{eq}=\frac{[CO_2]\times [H_2]}{[CO]\times [H_2O]}\)  

Now put all the given values in this expression, we get :

\(K_{eq}=\frac{0.16\times 0.16}{(0.35-0.16)\times (0.40-0.16)}\)

\(K_{eq}=\frac{0.16\times 0.16}{(0.19)\times (0.24)}=0.56\)

Thus \(K_{eq}\) at  the temperature of the experiment is 0.56.

In an exothermic reaction, the reactants have more energy than the products.

According to the law of reciprocal proportions, they should combine in the ratio of 10.24:7.92:1.29 by mass.

According to the law of reciprocal proportions when two elements join to form more than one compound, the weights of one element that combine with a fixed weight of the another are in a ratio of small whole numbers.

In phosphine, phosphorus = 91.1 parts and hydrogen = 8.9 parts

So, 8.9 pads of hydrogen combine with phosphorus = 91.1 parts .

1 part of hydrogen combine =  91.1 / 8.9

= 10.24 parts

Similarly,

for water 88.8 / 11.2

= 7.92 parts of hydrogen

For Phosphorus tetra oxide

= 56.4 / 43.6

= 1.29 parts

Thus, According to the law of reciprocal proportions, they should combine in the ratio of 10.24:7.92:1.29 by mass.

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The total number of electrons  Al+3. Fe¹3 Mg² Sn¹² Co²Co³ Lit¹ Cr+3,  Rb Pt+2 are 3, 3, 2, 12, 2, 3, 0, 3.0,2 electrons

Electrons are subatomic particles that have a negative charge and are found outside the nucleus of an atom. They orbit the nucleus in shells or energy levels and are involved in chemical bonding and electricity. Electrons are much smaller in size compared to protons and neutrons, which make up the nucleus of an atom.

Al+3 has 10 electrons (13 protons - 3 electrons).

Fe¹3 has 20 electrons (26 protons - 3 electrons).

Mg² has 10 electrons (12 protons - 2 electrons).

Sn¹² has 50 electrons (50 protons - 12 electrons).

Co² has 27 electrons (27 protons - 2 electrons).

Co³ has 26 electrons (27 protons - 3 electrons).

Li¹ has 3 electrons (3 protons - 0 electrons).

Cr+3 has 21 electrons (24 protons - 3 electrons).

Rb¹ has 37 electrons (37 protons - 0 electrons).

Pt+2 has 76 electrons (78 protons - 2 electrons).

Therefore,  The number of electrons in an atom determines its chemical behavior and the way it interacts with other atoms.

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Answer: Friction

Explanation: It is Friction because force acts in the opposite direction to the motion of the ball slowing it and eventually stopping it.

Answer:

We need more? What else is in the question? This is unanswerable.

Explanation:

The reaction below that would result in a net increase in entropy is

I₂(g) ⇒ 2I(g) and the correct option is option 3.

Entropy is the measure of the disorder of a system. It is an extensive property of a thermodynamic system, which means its value changes depending on the amount of matter that is present.

Entropy increases when solid changes to a liquid and a liquid changes into gases.

Entropy also increases when the number of moles of gaseous products increases more than the reactants.

In this reaction, the reactant side has 1 mole of a gas while product has two moles and thus increase in entropy.

Thus, the ideal selection is option 3.

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Answer:

there are 6 MOLES of zinc nitrate in 145 g

The food caloric content of the candy bar in nutritional calories per gram is 135 Cal.

Calorimeter is used to measure the amount of heat energy (Q) produced during a certain reaction. It depends on the mass of the substance (m), heat capacity (c) and the change in temperature (ΔT) during the process.

Mathematically it could be represented as,

\(\rm Q\ =\ m\times c\times \Delta\ T\)

     \(\rm =\ 23.3\times 8.72\times 15.5\)

     \(\rm = 3149.228\ kcal\)

The heat released during the process is 3149.228 kcal.

To calculate the nutritional calories per gram, divide the heat released by the mass in grams.

\(\rm Calories\ per\ gram\ = \frac{3149.228}{23.3}\)

                            \(\rm = 135.16\ kcal\)

                            \(\rm = 135\ Cal\)

Therefore, The food caloric content of the candy bar in nutritional calories per gram is 135 Cal.

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According to Newton's second law, force equals mass multiplied by acceleration. As a result, in a car accident, the force exerted by the vehicle and its occupants decreases as the time required for the vehicle to stop increases.

We clearly observed in the Exploration that when two cars collide, each feels a force from the other.

According to Newton's third law, when one object exerts a force on another, the second object feels an equal and opposite force exerted by the first object. This is very clear in the two-object collision.

The force with which your body is struck in a collision is referred to as crash force. Crash force is equal to your body weight multiplied by the vehicle's speed.

Newton's second law states that force equals mass multiplied by acceleration. As a result, the force exerted by the vehicle and its occupants in a car accident decreases as the time required for the vehicle to stop increases.

Thus, this way it hits the car.

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The minimum liter of water that must pass through a sample of the compound at 35.2°C to vaporize 1.0 mg of the compound is 0.44 L.

To answer this question, use the ideal gas sales formula:

                                          PV=nRT

P is the ideal gas pressure (Pa).

V is the ideal gas volume (m³).

n is the number of moles of particles (mol).

R is the ideal gas constant with the R value for all gases being the same. R = 8.314 x 10³J/kmol.K.

T is the ideal gas temperature (K).

Using the ideal gas equation

T = 35.2 + 273 = 308.2 K

The molar mass of methyl salicylate = 152.15 gm/mol

number of moles: n = 1 mg/152.15 gm/mol = 6.57 * 10^(-6) mol

PV = nRT

0.278/760 * V = (6.57 * 10^(-6)) * 0.0821 * 308.2

3.6 x 10-4 * V = 1.6x 10-4

                  V = 1.6x 10-4/3.6 x 10-4

                  V = 0.44 L

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answer:

5.4moles

Explanation:

from the equation 2 moles of C2H6 will react to give 6 moles of H2O

COMPARING

2 --- 6

1.8--- X moles

cross multiply

you get

X = (6×1.8)/2

= 5.4moles

There are approximately 1.62 x 10^25 water molecules in the 499.8 mL bottle of water.

To determine the number of water molecules in the given volume of water, we need to use the relationship between mass, volume, and molar mass of water.

First, we need to find the mass of water in the bottle:

Mass = Density * Volume

Mass = 0.967 g/mL * 499.8 mL = 483.9 g

Next, we need to convert the mass of water to moles using the molar mass of water. The molar mass of water (H2O) is approximately 18.015 g/mol.

Moles = Mass / Molar mass

Moles = 483.9 g / 18.015 g/mol = 26.88 mol

Finally, we can calculate the number of water molecules using Avogadro's number, which is approximately 6.022 x 10^23 molecules/mol.

Number of molecules = Moles * Avogadro's number

Number of molecules = 26.88 mol * (6.022 x 10^23 molecules/mol) = 1.62 x 10^25 molecules

Therefore, there are approximately 1.62 x 10^25 water molecules in the 499.8 mL bottle of water.

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The false statement about the gas expansion process is "∆S(system)=0".

When the gas expands into the vacuum, it undergoes an irreversible process. The gas molecules move from a region of high concentration to a region of low concentration, and as a result, there is an increase in entropy (∆S) of the gas.

According to the Second Law of Thermodynamics, the entropy of an isolated system will always increase for an irreversible process. Therefore, the entropy of the system, in this case, the gas, increases as it expands into the vacuum. The false statement about the gas expansion process is "∆S(system)=0". The other statements are true for this process. Since there is no temperature difference between the gas and the surroundings, the change in temperature is zero (∆T=0). The change in internal energy (∆E) is also zero since the gas is expanding against no external pressure. Finally, since there is no heat transfer between the system and the surroundings, the work done (∆PE + ∆KE) is equal to the heat transfer (w = q).

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Answer:

b. NH3(aq) does not contain OH- ions.

Explanation:

According to Arrhenius in his definition, a base is a substance that has the ability to increase the hydroxyll ion (OH-) of an aqueous solution. In other words, Arrhenius bases dissociates into OH- when dissolved in water.

According to this question, ammonia (NH3) will not be considered an Arrhenius base because it does not contain OH-. This means that ammonia (NH3) cannot dissociate into hydroxyll ion when dissolved in water.

Answer:

here is something I know

hope it works :)

Explanation:

Visible light has a wavelength range from ~400 nm to ~700 nm. Violet light has a wavelength of ~400 nm, and a frequency of ~7.5*1014 Hz. Red light has a wavelength of ~700 nm, and a frequency of ~4.3*1014 Hz.

Considering the definition of period, group and electronic configuration:

The elements are arranged in horizontal rows, called periods, and in columns, called groups.

The Electronic Configuration of the elements is the arrangement of all electrons of an element in energy levels and sub-levels (orbitals).

There are 7 energy levels, numbered from 1 to 7, and in which electrons are distributed, logically in order according to their energy level.

Each level is divided into sub-levels. These sub-levels into which each level is divided can be up to 4. These 4 sub-levels are called: s, p, d, f.

The placement of the elements in the periodic table is done taking into account the electronic configuration.

In each period, the elements whose last level of their electronic configuration coincides with the number of the period appear.

On the other hand, in each group appear the elements that present the same number of electrons in the last occupied level or valence shell.

In summary:

Learn more:

Answer:

5.55

Explanation:

see explanation attached

hope it helps

26.62 grams of HBr would be present in 355 mL of a 7.5% m/v HBr solution.

Concentration refers to the amount of a substance in a defined space. Another definition is that concentration is the ratio of solute in a solution to either solvent or total solution.

There are various methods of expressing the concentration of a solution.

Concentrations are usually expressed in terms of molarity, defined as the number of moles of solute in 1 L of solution.

Solutions of known concentration can be prepared either by dissolving a known mass of solute in a solvent and diluting to a desired final volume or by diluting the appropriate volume of a more concentrated solution (a stock solution) to the desired final volume.

Given,

HBr = 7.5% m/ v

This means 7.5g of HBr in 100 ml of the solution.

1 ml of the solution has 0.075g

355 ml of the solution will have = 0.075 × 355 = 26.62g of HBr

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Answer:

a substance that tends to bring about reduction by being oxidized and losing electrons.

Answer:

a substance that reduces a chemical compound usually by donating electrons.

Answer:

Explanation:

a) The balanced equation for the double replacement reaction between lead (II) nitrate and potassium bromide is:

Pb(NO₃)₂(aq) + 2KBr(aq) → PbBr₂(s) + 2KNO₃(aq)

In this reaction, lead (II) bromide (PbBr₂) will precipitate, while potassium nitrate (KNO₃) will remain in solution.

b) To determine the amount of precipitate produced, we need to first determine the limiting reactant. We can do this by calculating the number of moles of each reactant and comparing it to the stoichiometry of the balanced equation.

The molar mass of lead (II) nitrate is 331.21 g/mol and the molar mass of potassium bromide is 119.00 g/mol.

The number of moles of lead (II) nitrate is 32.5 g / 331.21 g/mol = 0.0981 mol The number of moles of potassium bromide is 38.75 g / 119.00 g/mol = 0.3256 mol

According to the balanced equation, one mole of lead (II) nitrate reacts with two moles of potassium bromide to produce one mole of lead (II) bromide. This means that if all the lead (II) nitrate were to react, it would require 0.0981 mol * 2 = 0.1962 mol of potassium bromide.

Since we have more than enough potassium bromide (0.3256 mol > 0.1962 mol), lead (II) nitrate is the limiting reactant.

The number of moles of lead (II) bromide produced will be equal to the number of moles of lead (II) nitrate consumed, which is 0.0981 mol.

The molar mass of lead (II) bromide is 367.01 g/mol, so the mass of lead (II) bromide produced will be 0.0981 mol * 367.01 g/mol = 36.0 g.

c) To determine the amount of excess reactant remaining, we need to subtract the amount consumed from the initial amount.

The number of moles of potassium bromide consumed is half the number of moles of lead (II) nitrate consumed, which is 0.0981 mol / 2 = 0.04905 mol.

The mass of potassium bromide consumed is 0.04905 mol * 119.00 g/mol = 5.84 g.

The mass of potassium bromide remaining is 38.75 g - 5.84 g = 32.91 g.

Answer:

FIREWORKS : WHEN FIREWORKS EXPLODE THEY EXPEL SMOKE WHICH IS A FORM OF GAS AND THEY LIGHT UP WHICH IS ANOTHER CHEMICAL REACTION AND OF COURSE THE WHOLE FIREWORK GETS HOT ( Temperature rises )

Explanation:

you could see your reaction happens when original substance changes in color temperature formation produces light or gas in many other things

( besides it's original form! )

answer what changed from it's original form!

ex: baking a cake:

the cake change form ( rising ) due to heat ( rising temperature )

REACTION WAS:

- formation of precipitate ( solid to settle out of a solution )

- change I'm temperature to bake the cake

Extra:

you got this!

I hope I helped even just a little!

Answer:

The Answer will be provided below, please pay attention in class next time so that you don't have to be in a hurry like you are in now.

Explanation: The correct option is:

Both fossil fuels and wind energy can be used to produce electricity. However, burning fossil fuels does pollute the atmosphere, while using Earth's wind does not. Both fossil fuels and wind energy contribute to climate change, but the use of fossil fuels is much more damaging to the environment than the use of wind power.

Fossil fuels are non-renewable sources of energy that are formed over millions of years by the decomposition of organic matter. They release harmful greenhouse gases when burned, contributing to climate change. In contrast, wind energy is a renewable source of energy that uses turbines to harvest the power of wind. Wind energy does not produce any emissions, making it an environmentally friendly alternative to fossil fuels. While wind turbines can have some impacts on wildlife and habitats, the impact is much less severe than the effects of fossil fuel extraction and burning.

Added Part: Fossil fuels are non-renewable sources of energy that are derived from the remains of plants and animals that died millions of years ago. These sources include coal, oil, and natural gas. Wind energy, on the other hand, is a renewable source of energy that is generated by the kinetic energy of wind.

Here are some comparisons between fossil fuels and wind energy:

Environmental Impact: Fossil fuels have a significant negative impact on the environment. Burning fossil fuels produces greenhouse gases that contribute to climate change. The extraction of fossil fuels also has negative impacts on the air, water, and soil. Wind energy, however, has a very small environmental footprint. Wind turbines do not produce any emissions and do not require any water to generate electricity.

Energy Availability: Fossil fuels are abundant and have been the primary source of energy for decades. On the other hand, wind energy is a relatively new source of energy and the technology is still developing. However, the availability of wind energy is significant, as wind is a renewable source that is constantly available.

Sustainability: Fossil fuels are non-renewable, which means they will eventually run out. As the demand for energy continues to increase, the availability of fossil fuels will decrease. Wind energy is a renewable source of energy that will never run out.

Here are some pros and cons of both fossil fuels and wind energy:

Fossil Fuels:

Pros:

Reliable source of energy

High energy density

Large global infrastructure

Cons:

Non-renewable source of energy

Significant environmental impact

Price instability

Wind Energy:

Pros:

Renewable source of energy

Small environmental footprint

Low operating costs

Cons:

High initial costs for building wind turbines

Wind is an inconsistent source of energy

Can create noise pollution for surrounding communities

Answer:

PCl₃

Explanation:

To determine the empirical formula of a compound, we need to follow a series of steps.

Step 1: Divide each percent composition by the atomic mass of the element

P: 22.6/30.97 = 0.729

Cl: 77.4/35.45 = 2.18

Step 2: Divide all the numbers by the smallest one, i.e. 0.729

P: 0.729/0.729 = 1

Cl: 2.18/0.729 ≈ 3

The empirical formula of the compound is PCl₃.

Answer:

134.5 grams

Explanation:

There are 134.5 grams in 4.5 moles of Li2O (lithium oxide).

BRAINLIEST PLZZZZZ

Mole measure the number of elementary entities of a given substance that are present in a given sample. Therefore, 135g are in 4.5 moles of Li\(_2\)O.

The SI unit of amount of substance in chemistry is mole. The mole is used to measure the quantity of amount of substance. we know one mole of any element contains 6.022×10²³ atoms which is also called Avogadro number. Mole is inversely proportional to molar mass of given substance. Mole is directly proportional to given number of atoms present in that substance.

Mathematically, molar mass and mole can be related as

mole of  Li\(_2\)O =given mass of Li\(_2\)O÷ Molar mass of  Li\(_2\)O

Molar mass of  Li\(_2\)O=30 g/mol

mole of  Li\(_2\)O=4.5 moles

Substituting the values

4.5 moles =mass of Li\(_2\)O÷ 30 g/mol

mass of Li\(_2\)O = 135g

Therefore, 135g are in 4.5 moles of Li\(_2\)O.

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The Medal of Honor is the best navy decoration and highest volume.

The President of the USA The Victoria go is the holy grail for Medal of Honor creditors because there are the best in lifestyles. Bearing the inscription For valor and called a VC, this medal turned into first offered for conspicuous bravery' in 1856 and later backdated to the Crimean conflict of 1854. The outstanding service pass is the second maximum army ornament that may be provided to a member of the American military, for intense gallantry and risk of lifestyle in actual combat with an armed enemy force.

The Bronze Star Medal dates lower back to world battle II. these days, it is the fourth-maximum ranking award a provider member can obtain for a heroic and meritorious deed performed in an armed battle. For individuals who acquire the BSM, it's far a sign of their sacrifice, bravery, and honor at the same time as serving their us of a

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To convert micrometers cubed (μm^3) to cubic centimeters (cm^3), we need to divide by 10^12 (since there are 10^12 μm^3 in 1 cm^3).

So, to convert 231 μm^3 to cm^3, we can use the following formula:

231 μm^3 ÷ (10^12 μm^3/cm^3) = 2.31 x 10^-10 cm^3

Therefore, 231 μm^3 is equal to 2.31 x 10^-10 cm^3.

:)

To convert micrometers cubed (μm^3) to cubic centimeters (cm^3), we need to divide by 10^12 (since there are 10^12 μm^3 in 1 cm^3).

So, to convert 231 μm^3 to cm^3, we can use the following formula:

231 μm^3 ÷ (10^12 μm^3/cm^3) = 2.31 x 10^-10 cm^3

Therefore, 231 μm^3 is equal to 2.31 x 10^-10 cm^3.

:)

The mass of hydrogen needed to produce 51.0 grams of ammonia is  ≈ 9.07 grams.

To determine the mass of hydrogen required to produce 51.0 grams of ammonia (NH3) using the Haber process, we need to calculate the stoichiometric ratio between hydrogen and ammonia.

From the balanced chemical equation:

3 H₂(g) + N₂(g) → 2 NH₃(g)

We can see that for every 3 moles of hydrogen (H₂), we obtain 2 moles of ammonia (NH₃).

First, we need to convert the given mass of ammonia (51.0 grams) to moles. The molar mass of NH₃ is 17.03 g/mol.

Number of moles of NH₃ = Mass / Molar mass

                     = 51.0 g / 17.03 g/mol

                     ≈ 2.995 moles

Next, using the stoichiometric ratio, we can calculate the moles of hydrogen required.

Moles of H₂ = (Moles of NH₃ × Coefficient of H₂) / Coefficient of NH₃

           = (2.995 moles × 3) / 2

           ≈ 4.493 moles

Finally, we can convert the moles of hydrogen to mass using the molar mass of hydrogen (2.02 g/mol).

Mass of H₂ = Moles × Molar mass

          = 4.493 moles × 2.02 g/mol

          ≈ 9.07 grams

Therefore, approximately 9.07 grams of hydrogen is needed to produce 51.0 grams of ammonia in the Haber process.

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