what is the final pressure (in atm) of 5.25 L gas initially at 534 mmHg and 22 degrees celsius that is compressed to a final volume of 2.75 L at a new temperature of 15 degrees celsius?

Answer:

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According to the Le Chatlier's Principle, an equilibrium system will adapt to a change in temperature, volume, or the quantity of molecules in a reactant or product in order to reestablish balance.

The smallest unit of a substance that keeps its content and properties is a molecule, which is made up of two or more atoms linked together by chemical bonds. The building blocks of chemistry are molecules. A subscript with the atom count is placed after the element symbol to identify molecules.

When two or more molecules interact to create a brand-new product, a chemical reaction takes place. Reacting substances are referred to as reactants, whilst newly created substances are referred to as products.

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The first step we have to follow to answer this question is to convert the given mass to moles using CaCO3 molar mass:

Now, use the following formula to find the volume of water needed to prepare the solution:

It means that 0.29L are needed.

Answer: Glass is see through

Explanation:

Answer: Glass shaped into lens can bend light that passes through it

        -  Hyperopia (far-sightedness) : When the eye focuses light behind of the retina.

        - Myopia (near-sightedness): When the eye focuses light in front of the eye.

Molarity or molar concentration is a measure of the concentration of a chemical species, of a solute in a solution, using as units, number of moles, and volume in liters. The formula for Molarity is:

M = n/V

Where:

n = number of moles, 1.7 moles

V = volume in Liters, 2.8 Liters

Now we add these values into the formula:

M = 1.7/2.8

M = 0.61

The Molarity is 0.61 M

The wind tends to blow from over the water to over the land due to the differences in the density of air. Air over the water is cooler than air over the land and denser air from over the water flows toward the land. Therefore, options A, C, and D are correct.

The sea breeze is the wind that blows across the sea toward land throughout a sunny day. The air over land heats up more quickly during the day and starts to rise in coastal areas.

A low-pressure area forms on the surface of the land as the warm air rises, allowing air over the water to enter. As a result, during the day the wind direction is from the water to the land and this wind happens to be the sea breeze.

The sea breeze is a thermally produced wind during the day blowing from the cool ocean towards warm land. It is caused by the difference in the density of air between the land and the ocean.

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Answer:

dt=20.08

Explanation:

Q=msdt

840=10*4.184*dt

dt=840/(10*4.184)

dt=20.08

The hybrid orbital of this molecule is B. sp³d

Trigonal symmetry was used to generate a combination of s and p orbitals, which are kept at 1200. Ethylene (C2H4) sp3 hybridization is an example of sp2 hybridization. To create a novel hybrid orbital known as the sp3 sp3 orbital, one's' orbital and three 'p' orbitals of equal energy are mixed in this type: One of four new comparable orbitals that result from geometrically combining one s orbital and three p orbitals to create a normal tetrahedron's four corners.

Again, we refer to them as sp3 particles because they are made up of a single s orbital and three p orbitals. These degenerate hybrid orbitals are created to offset the s-p transition's energy upward.

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So, the number of particles in a mole is about 80,000 the number of grains of sand on Earth’s beaches.

How to slove and Compare the value you calculated for the number of sand grains on Earth's beaches to the number of particles In mole?

Using sand grains that take up space of 1 mm, when these sand grains are laid side by side, there are about 1000 grains of sand per m, 1000000 per square m and 1000 × 1000 × 1000 per cubic m.

That is 10⁹ grains of sand per cubic meter.

An average beach has sand volume of (1.875 × 10⁷) cubic metres

There are over 400 beaches in the world, Using an estimate of 400 beaches

The number of grains of sand on Earth's beaches = 10⁹ × 400 × 1.875 × 10⁷

There are approximately (7.5 × 10¹⁸) grains of sand on all of the world's beaches

Then, Avogadro's number found that 1 mole of all particles contain

(6.022 × 10²³) particles.

So, the number of particles in a mole is about [(6.022 × 10²³)/(7.5 × 10¹⁸)]

the number of grains of sand on Earth’s beaches.

So, the division gives, (8.0 × 10⁴).

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1. The concentration of the vitamin C in ppm is 800 ppm

2. The concentration of the vitamin C in ppb is 800000 ppb

1. How to determin the concentration in ppm

The concentration of the vitamin C in ppm can be obtained as follow:

Concentration (in ppm) = (mass of solute / mass of solution) × 10⁶

Concentration (in ppm) = (0.12 / 150) × 10⁶

Concentration (in ppm) = 800 ppm

2. How to determin the concentration in ppb

The concentration of the vitamin C in ppb can be obtained as follow:

Concentration (in ppb) = (mass of solute / mass of solution) × 10⁹

Concentration (in ppb) = (0.12 / 150) × 10⁹

Concentration (in ppb) = 800000 ppb

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When the moon is at point 2, it will be covering Florida, which will cause some areas of the earth to be dark while others will be light.

Earth, the third planet from the sun, is the only place in the known cosmos where the presence of life has been established. With a 3,959-mile radius, Earth is the fifth-largest planet in our solar system and the only one whose surface is known to have liquid water. Moreover, the names given to Earth are distinctive.

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Answer

2319.698 g

Procedure

Use the Avogadro's number and then the molecular weight to convert into grams. The formula for aluminum bromide is AlBr₃.

The change in internal energy of the gas in the cylinder is +5000.84989kJ.

Energy is described as the quantitative property that is transferred to a body or to a physical system or simply the ability to do work.

The given parameters include:

q = +5001J (gained is +)

P =  750Torr ( 1atm /760 (Torr) = 0.987atm

w = −PΔV

w = −0.987atm(1.846L − 0.345L)

w = −1.481L • atm (101.325J/1atm)

w = −150.11J = −0.15011kJ

we know that

ΔU = w + q

ΔU = 5001kJ − 0.15011kJ = +5000.84989kJ (The positive sign denotes that system increased in internal energy)

The first law of thermodynamics dealt on energy and explained that

Energy is conserved and under normal circumstances, the total amount of energy is constant. It is difficult to measure total energy within a system because there are so many different forms of energy, but we can measure energy changes.

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In order to reliably compute the number of moles present from the measured weight and the known molar mass, is a chemical that can be exactly weighed out in pure forms, such as oxalic acid.

A standard solution is a liquid with a precisely known concentration that is made from a primary standard, which is a substance that is stable, highly pure, highly soluble in water, and has a high molar mass to enable precise weighing. The primary standard is weighed precisely and is made up to a specific volume.

The terms primary solution and secondary solution refer to two different categories of standard solutions. A primary standard solution is a highly pure, low-reactive solution. A secondary standard is less pure than a prime standard and more chemically reactive.

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Answer

a. True

Explanation

If there was nothing to avoid from objects pulling towards one another many results may happen.

The percent abundance of the cannellini beans in this sample is : 18.8 %

The average weighted = 1.9 g

M1 = mass of black eyed peas = 1.3

M2 = mass of cannellini = 2.9

x = % abundance

weighted average is given = 1.9 g

applying the formula :

M1x + M2 (1-x) = average weighted

1.3 × x + 2.9 (1-x) = 1.9

x = 0.812

% abundance of black eyed peas = 81.2 %

% abundance of cannellini beans = (1-0.812) = 0.188 = 18.8 %

Thus, The percent abundance of the cannellini beans in this sample is : 18.8 %

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Step 1

The equations used here:

------------

Step 2

Information provided:

[H3O+] = 3.5×10^−7 M

------------

Step 3

Procedure:

Firstly, from (1):

pH = -log [H3O+]

pH = -log (3.5×10^−7 M) = 6.5

----

From (3):

pH + pOH = 14

pOH = 14 - pH

pOH = 14 - 6.5

pOH = 7.5

----

From (2)

pOH = - log [OH-] => [OH-] = 10^-(pOH)

[OH-] = 10^-(pOH) = 10^-(7.5) = 3.2x10^-8 M

Answer: [OH-] = 3.2x10^-8 M

Answer

C) They're liquid solutions.

Explanation

An alloy is a mixture of metal with a second metal or other non-metal material. Airplanes, bicycles, and cooking pots are all usually made of different types of alloys. Examples of alloys include stainless steel, brass, bronze, brass, solder metal, pewter, and sterling silver.

Alloys can contain more than one metal so option A is not true.

Elements of an alloy do not combine through a chemical reaction. The mixing is generally done at a very high temperature where the elements and metals are melted, mixed, and left to cool; hence option B is not true.

Also, option D is not true because alloys are a mixture of metal with a second metal or other non-metal.

Hence, the best option is that all alloys are liquid solutions of metals and or other non-metals.

The correct answer is option C) They're liquid solutions.

The formula weight of zinc phosphate is 385g/mol.

The formula weight or molar mass of zinc phosphate is calculated by adding weight of every single element present in zinc phosphate.

Formula of zinc phosphate is Zn₃(PO₄)₂.

Weight of 3 zinc atoms = 3×65= 195g/mol

Weight of 2 phosphorus atoms =2×31=62g/mol

Weight of 8 oxygen atoms = 8×16= 128g/mol

So, the total molecular weight of the compound is 195+62+128= 385g/mol.

Thus, the molecular weight of zinc phosphate is 385g/mol.

Zinc phosphate is an inorganic chemical substance that is used as a priming pigment or as part of the electroplating process to provide a corrosion-resistant coating on metal surfaces. It is common practice to employ a seeding chemical as a pre-treatment because zinc phosphate adheres to crystalline structures better than bare metal. Dental practices use zinc phosphate, which is created from zinc phosphate cement.

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Best describes how a filter can be used to sort materials is filters allow objects of a certain size to pass through, so if you know the size or size range of a certain component in a mixture, you can pass the entire mixture through a filter and sort out the component in that size range

Filtration can be defined as the mechanical or physical process used for the separation of one substance from another and such as solids, liquids, and gases, with the aid of an any medium and when the substances in a mixture have different particle sizes, they are separated by filtration and the mixture is poured through a sieve or filter and the smaller particles slip through the holes, but the larger particles do not

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We have an initial concentration of a stock solution that has molarity equal to 1M. In a previous question, the stock solution was diluted 10 times, this solution was called solution A. The concentration of solution A found was equal to 0.1M.

Now, we are asked to find the concentration of solution B that starts from solution A.

The initial concentration C1 is the concentration of solution A, equal to 0.1M. The initial volume (V1) is 10mL, and the final volume (V2) is 100mL. We will apply the dilution equation that says:

We clear C2 and replace the known data:

Answer: The molarity of solution B is 0.01 M

Explanation:

According to the problem, hydrochloric acid will react with oxygen gas to produce water and chlorine gas.

hydrochloric acid + oxygen gas ----> water + chlorine gas

The balanced equation will be:

4 HCl + O₂ -----> 2 H₂O + 2 Cl₂

If we pay attention to the coefficients of the reaction we will see that 4 moles of HCl will react with 1 mol of O₂ to produce 2 moles of H₂O and 2 moles of Cl₂. So, 1 mol of O₂ will produce 2 moles of H₂O. The molar ratio between O₂ and H₂O is 1 to 2.

1 mol of O₂ : 2 moles of H₂O molar ratio

We can use this relationship to find the number of moles of H₂O that are produced from 5.52 moles of O₂.

moles of H₂O = 5.52 moles of O₂ * 2 moles of H₂O/(1 mol of O₂)

moles of H₂O = 11.0 moles

Answer: 11.0 moles of water are produced from 5.52 moles of oxygen gas.

The pH of an aqueous solution that is 0.200 mol/L in NH₃ and 0.300 mol/L in NH₄Cl is 7.9.

We will use Henderson-Hasselbalch equation to calculate the pH. It is given by -

pH = pKa + log [base]

                         [acid]

We know that,

base is NH₃

acid is NH₄⁺

we will calculate molarity as-

NH₃ : 0.200/2 = 0.1 M

NH₄⁺ : 0.300/2 = 0.15 M

Now, we will find pKa by -

Kw = Ka . Kb

Ka = 1 x 10⁻¹⁴

       1.8 x 10⁻⁵

Ka = 5.5 x 10⁻¹⁰

pKa = -logKa

pKa = 9.25

Substituting the values in equation,

pH = 9.25 + log  [0.1]

                          [0.15]

pH = 7.9

Therefore, the pH is found to be 7.9.

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Answer:

The CDC estimates the total economic burden of prescription opioid misuse in the United States is $78.5 billion a year.

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The student's approximate percent deviation or percentage of error in the measurement of the mass of the sample is 9.38 %.

Percent deviation is calculated to determine the accuracy of data collected during an experiment by comparing it to the theoretical results. Percent deviation is commonly used to check for data errors in student experiments.

Percent deviation can be referred to how much measured data differs from a known or theoretical value. A negative percent deviation indicates that the measured data is lower than the theoretical value. A positive percent deviation shows that the measured value is higher.

Given the actual value of the mass = 16 g

The calculated or approx value by student = 17.5 g

The percentage deviation = [(Approx - actual)/ actual ] × 100

                                              = [(17.5 - 16)/16] × 100

               Percentage error  = 9.38 %

Therefore, the student's approximate percent deviation is 9.38 %.

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Step 1 - Understanding what happens when a reaction reaches equilibrium

When a reaction reaches equilibrium, the concentration of reactants and products will not vary anymore. That doesn't mean the concentration of reactants will be equal to that of products. It won't. At least, not necessarily. It may be, but it may not as well.

What actually happens when equilibrium is reached is that both reactions - the direct and the reverse one - are happening with the same velocity, i.e., their rate of reaction is the same, and that's why neither the concentration of reactants nor products vary.

As soon as a new molecule of product is produced, another molecule of product is reacting back to produce the reactants once again.

Step 2 - Choosing the right alternative

The right alternative therefore is the rate for the forward and reverse reactions are the same.

Answer: the rate for the forward and reverse reactions are the same

When Boat A and Boat B have the same mass, the kinetic energy of Boat A is 9 times the kinetic energy of Boat B.

The energy that an object has because of its motion is called kinetic energy. We must apply a force to accelerate an object. Work is done  in applying a force. After work has been done and energy is transferred to the object, then the object will be move with a new constant speed.

Let' m' be the mass of both boats A and B.

It is given in the question that velocity of Boat A is three times greater than that of Boat B. Let the velocity of boat B be X, Kinetic energy of boat A be K₁  and kinetic energy of boat B be K₂

Kinetic energy of Boat A is:

K₁ = 1/2 * (mV₁)^2

  =1/2 * m *3X^2

   =9(1/2*m*X^2)

Kinetic energy of Boat B is:

K₂ = 1/2 *m *V₂^2

     =1/2* m* X^2

K₂ = 1/2*m*X^2

This implies that ,K₁  = 9* K₂

Kinetic energy of Boat A is 9 times the kinetic energy of Boat B.

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4.094*10^23 moles of Al(CN)3

1 mole = 6.022*10^23 atoms

0.68 moles = x atoms

x = 4.094*10^23 atoms of Al(CN)3

Answer:

Which one ? can u put a question here?