A 250mL sample of air at STP contains approximately 52.5mL of O2. What is the percentage of oxygen in the air

The pH of the solution with a hydronium ion concentration of 1.3x10⁻³ M is calculated to be approximately 2.886, indicating that the solution is acidic.

The pH of a solution is calculated using the formula pH = -log[H3O+], where [H3O+] is the hydronium ion concentration in moles per liter (M). Given a hydronium ion concentration of 1.3x10^-3 M, we calculate the pH as follows:

Write the concentration of hydronium ions as 1.3x10⁻³ M.

Apply the pH formula: pH = -log(1.3x10⁻³).

Calculate the logarithm: pH = -(-2.886) = 2.886.

Therefore, the pH of the solution is approximately 2.886, which indicates that the solution is acidic.

Answer:

Option D. 149L

Explanation:

Step 1:

The balanced equation for the reaction. This is given below:

N2 (g) + 3H2 (g) → 2NH3 (g)

Step 2:

Determination of the number of mole of NH3 produced by the reaction of 3.50 mole of N2. This is illustrated below:

From the balanced equation above,

1 mole of N2 reacted to produce 2 moles of NH3.

Therefore, 3.5 moles of N2 will react to produce = 3.5 x 2 = 7 moles of NH3.

Therefore, 7moles NH3 is produced.

Step 3:

Determination of the volume of NH3 produced from the reaction. This can be achieved as shown below:

Data obtained from the question include:

Temperature (T) = 25.0°C = 25.0°C + 273 = 298K

Pressure (P) = 1.15 atm

Number of mole (n) = 7 moles

Gas constant (R) = 0.082atm.L/Kmol

Volume (V) =..?

Applying the ideal gas equation to obtain the volume:

PV = nRT

Divide both side by P

V = nRT /P

V = (7 x 0.082 x 298)/1.15

V = 149 L

Therefore, the volume of NH3 produced from the reaction is 149L

The number of carbon atoms present in a 2.5 carat diamond is approximately 2.5 x 10^22, determined by first converting the weight of the diamond to grams, then to moles utilizing the molecular weight of carbon, and finally to atoms using Avogadro’s number.

To determine the number of carbon atoms present in a 2.5 carat diamond, we need essential information about carbon and the diamond. The molecular weight of carbon (C) is 12.01 g/mol. We also know that a carat is 200 milligrams (mg) or 0.2 grams (g).

So, a 2.5-carat diamond weighs 0.2 g * 2.5 = 0.5g. We convert the mass of the diamond into moles using the molecular weight of carbon: 0.5 g / 12.01 g/mol = 0.0416 moles.

Then, knowing that one mole of any substance contains Avogadro's number of entities (approximately 6.022 * 10^23), we multiply the number of moles by Avogadro’s number: 0.0416 moles * 6.022 * 10^23 atoms/mole = 2.5 * 10^22 carbon atoms.

So, a 2.5 carat diamond contains about 2.5 * 10^22 carbon atoms.

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Answer:

7.50

Explanation:

pH=-log(H3O+)

- Hope that helps! Please let me know if you need further explanation.

Answer:

1.Legs

2.Arms and hands

3.Armor

4.Skeletal

5.Carpenters

6.Brain

7.Skin

8.Blood

Explanation:

You can google dem and it will show you all the answers

Answer:

legs

arms and hands

skeletal system

carpenter

brain

skin

blood

Explanation:

Answer:

a) Combustion

b) S8 + 8O2  -> 8SO2

c) 0.125 mol SO2

Explanation:

a) Combustion

b) S8 + 8O2  -> 8SO2

c)

[tex]4.0 g S8 (\frac{1 mol S8}{256 g S8})(\frac{8 mol SO2}{1 mol S8} ) =0.125 mol SO2[/tex]

Answer:

4 & 5

Explanation:

Answer:

4

5

Explanation:

got it right on edg 2021

Answer:

3.09 × 10-27  kg

Explanation:

I also had this question on edge and got it correct

Answer:

the answer is C

Explanation:

just took this on eng2020

Answer:

The one that isnt a fact is that all balls are made of leather.

Good luck! Hope this helped!

:)

Explanation:

Answer:

This happens because there was an electric charge.

Answer:

Green food coloring diffusing through cookie dough.

Explanation:

Entropy is a physical quantity for an equilibrium thermodynamic system that measures the degree of organization of the system, or that is the ratio of an increase in internal energy to an increase in temperature of the system.

When the green dye diffuses through the cookie dough there is an increase in entropy, that is, there is an increase in system disorder at the molecular level, where a change in cookie dough occurs.

Answer:

B. green food coloring diffusing through cookie dough

Explanation:

Answer:

1034.88J

Explanation:

Given that:

mass (m) = 11.2 g, initial temperature = 0°C, final temperature = 22°C, the specific heat capacity of water (C) = 4.2 J/g°C

Temperature difference (ΔT) = final temperature - initial temperature = 22 - 0 = 22°C

The quantity of heat (Q) required to melt the ice can be calculated from the equation:

Q = mCΔT

Q = 11.2 g × 4.2 J/g°C × 22°C

Q = 1034.88J

Answer:

removing topsoil, and putting up fencing

Explanation:

hopefully this is correct :)

Answer: 36.8 L

hope this helps

Answer:

lonic

Explanation:

MgF2 ( Magnesium fluoride ) is ionic.

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Final answer:

Magnesium fluoride (MgF₂) is an ionic compound formed by the transfer of electrons from metallic magnesium to nonmetallic fluoride, resulting in Mg2+ cations and F- anions held together by ionic bonds.

Explanation:

Magnesium fluoride (MgF₂) is an ionic compound. This is because it is formed from magnesium, a metal with a low electronegativity, and fluoride, a nonmetal with a high electronegativity. The electronegativity difference between magnesium and fluoride leads to the transfer of electrons from magnesium to fluoride, creating Mg2+ cations and F- anions. These ions are held together by strong electrostatic forces, known as ionic bonds, which result in the formation of an ionic solid. Ionic compounds have certain characteristics such as high melting points due to the strong ionic bonds in their lattice structure.

Examples of other ionic compounds include KCl, NaCl, and MgCl₂, all of which are made up of a metal and a nonmetal, just like magnesium fluoride. The type of bonding in a compound like MgF₂ also leads to properties such as poor conductivity in the solid state but the ability to conduct electricity when molten. This is because the ions are fixed in place in the solid lattice but can move freely when in the liquid state.

The net force on the rope is equal to zero as both forces are in equal magnitude but in opposite directions.

The net force on an object can be defined as the vector sum of all forces acting on a particle or object. The net force can be described as a single force representing same the effect of the actual forces on the motion of a particle. Net force offers the same value of acceleration as all those actual forces together.

The net force has a similar effect on the rotational motion as all actual forces taken together so it becomes the resultant force. It.

In the given problem, the applied force by Jared and James is in the opposite direction of the force applied by Mr. Collins.

Given, the force applied by James and Jared in the left direction= 300N

The force applied by Mr. Collins in the right direction = -300N

The net force on the rope = 300N + (-300N) = 0

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Answer:

Thus, as both an amphoteric compound and the most common liquid on Earth, it follows that water is both the most common acid as well as the most common base on planet Earth

The most common acid in the world is sulfuric acid (H2SO4), and the most common base is sodium hydroxide (NaOH).

Acids and bases are common substances found in many everyday items. The most common acid in the world is sulfuric acid (H2SO4). It is used in various industrial processes and has a wide range of applications.

The most common base in the world is sodium hydroxide (NaOH). It is commonly known as caustic soda and is used in many household products such as detergents and drain cleaners.

The enthalpy of a reaction can be predicted from the enthalpy of reactants and products. The enthalpy of the reaction is - 175.9 kJ/mol.

The enthalpy of a reaction is the heat energy released or absorbed by the reaction system. For heat absorption, enthalpy is positive and for evolution, enthalpy is negative.

Th enthalpy of reaction = enthalpy of products - enthalpy of reaction.

Given enthalpy of reactants

ΔH (NH₃) = -46.19 kj/mol

ΔH(HCl) = - 92.30 kj/mol

ΔH(NH₄Cl) = -314.4 kj/mol

Reaction enthalpy = -314.4 kj/mol - (-46.19 kj/mol +- 92.30 kj/mol ) =- 175.9 kJ/mol.

Therefore, the reaction enthalpy is - 175.9 kJ/mol..

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Answer:

A weak electrolyte is an electrolyte that does not completely dissociate in aqueous solution. The solution will contain both ions and molecules of the electrolyte. Weak electrolytes only partially ionize in water (usually 1% to 10%), while strong electrolytes completely ionize (100%).

Explanation:

The weak electrolyte are characterized to be partially dissociates or ionizable in water. Hence, option B is correct.

Electrolyte can be given as the chemical compound present in the form of liquid or gel with the ability to dissociate into the constituent ion on the dissolution or the application of electricity.

The ability of the electrolyte to be dissociated into the constituent ions differentiate them as strong and weak electrolytes. The electrolytes that can be easily dissociated into the constituent ions are termed as strong electrolytes.

The compounds that found not to be completely ionized into the constituent ions on dissolution in water are termed as weak electrolytes. These are partially ionizable. Thus, option B is correct.

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Crossbreeding in agriculture involves combining two plants to create a new variety with improved traits by using traditional breeding techniques or modern genetic engineering to produce GMOs.So the correcct option is A.

When engineers increase output through crossbreeding, they are combining two plants so that each plant's strengths compensate for the other's weaknesses. This is a method that has been employed to develop new crop varieties with desirable traits such as disease resistance, better nutritional value, and improved shelf-life. Crossbreeding can involve traditional breeding techniques with closely related species or could be done through modern biotechnology practices - creating genetically modified organisms (GMOs), where specific genes are introduced to give the crop beneficial traits like herbicide resistance, better taste, or drought tolerance.

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Answer:  The pressure of the tank will be 2.63 atm

Explanation:

According to ideal gas equation:

[tex]PV=nRT[/tex]

P = pressure of gas = ?

V = Volume of gas = 4.44 L

n = number of moles = 0.481

R = gas constant =[tex]0.0821Latm/Kmol[/tex]

T =temperature =[tex]22.6^0C=(22.6+273)K=295.6K[/tex]

[tex]P=\frac{nRT}{V}[/tex]

[tex]P=\frac{0.481mol\times 0.0821Latm/K mol\times 295.6K}{4.44L}=2.63atm[/tex]

The pressure of the tank will be 2.63 atm

Answer: The pressure of given tank is 2.63 K.

Explanation:

The given data is as follows.

      V = 4.44 L,          n (no. of moles) = 0.481 mol,

      T = [tex]22.6^{o}C[/tex] = (22.6 + 273) K = 295.6 K

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

Now, using the ideal gas equation we will calculate the pressure of the given tank as follows.

               PV = nRT

 [tex]P \times 4.44 L = 0.481 mol \times 0.0821 atm L/mol K \times 295.6 K[/tex]

              P = 2.63 atm

Therefore, we can conclude that the pressure of given tank is 2.63 K.

Answer:

the object causes the light to change direction & the light bends enough to seperate the colors

also, tell me if i'm wrong

Answer:194.1411 g/mol

Explanation:

Answer:

Gg and Gg

Explanation:

Answer:

The both must be balanced and every input must be accounted for at the output.

Explanation:

In taking inventory at the store, one must make sure that the total inventory is always balanced at the end of the inventory log (all stocks taking out must be accounted for in the end) so also is the chemical reaction in which the total reactants species atoms must equal the total product specie atoms.

Some applications of fission reactions are for generating large amounts of heat and as the energy source in nuclear weapons.

Nuclear fission is a reaction in which the nucleus of an atom splits into two or more smaller nuclei.

Nuclear fission can be useful in terms of generating large amounts of heat that can be used to produce nuclear power and as the energy source in nuclear weapons.

Thus, some applications of fission reactions are for generating large amounts of heat and as the energy source in nuclear weapons.

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Answer:

B, C, E

Explanation:

Answer: 5.9%

Explanation: e2020

Answer:

c) 5.9%

Explanation:

got it correct on edg