in a first order decomposition, the constant is 0.00169 sec-1.what percentage of the compound has decomposed after 3.45 minutes?

Explanation:

Crystallography. an arrangement in space of isolated points (lattice points ) in a regular pattern, showing the positions of atoms, molecules, or ions in the structure of a crystal.

If an atom experiences sufficient thermal activation, it can move to a neighboring lattice position.4 If the vibration frequency of the atom is v and the atom has Z nearest neighbors, the total number of jump attempts is vZ. However, only a small fraction of the attempts will be successful, with a probability depending on the ratio between the necessary activation energy for a single jump QD and the thermal activation kBT. The effective jump frequency ΓD is then

(5.6)

With each successful jump, the atom travels one atomic distance λ and the total traveling distance in unit time is thus ΓDλ. Substituting the jump frequency ΓD into the expression for the root mean square displacement of a random walker [equation (5.5)] and using the spatial coordinate r leads to

Answer:

The combination,decomposition and displacement of or between atoms or a molecule during chemical change is called chemical reaction.

Explanation:

Answer:

Chemical reaction is defined as the process in which two or more than two reactants react together to form a different products at certain condition.

eg.

2H2+02=2H20

here hydrogen and oxygen react to form a water.

Given that 16 g CH4 + 64 g 02 - 44 g CO2 + 36g H2O

To explain the law of conservation of mass and describe how the equation represents the law of conservation of mass, let me first start from law.

The law state that: mass can neither be created nor destroyed.

The mass of each element at the reaction side must be equal or the Same with the magnitude of mass at the product

The equation represents the law of conservation of mass because the mass of molecules at the right hand side is equal to or balance with the molecules at the left hand side. For example, the number of Oxygen, and othe elements are the at both side.

Answer:

CH4(g) + 2O2(g)→ CO2(g) + 2H2O(g) Which ... Since 1 mole methane = 12+4×1=16 g and 2 mole oxygen =2×32=64 g, ... 1 molecule or 16 g) of CH4​ reacts with 2 moles or 2 molecules or 64 g of ... or 1 molecule or 44 g of CO2​ and 2 mole or 2 molecules or 36 g of water.

Explanation:

here is a combustion of methane bc im stupid

Answer:

Natural selection is the process through which populations of living organisms adapt and change. ... Through this process of natural selection, favorable traits are transmitted through generations. Natural selection can lead to speciation, where one species gives rise to a new and distinctly different species .

Explanation:

i just looked it up lol .

The final volume of the balloon is 0.61 L

The Ideal gas law is the equation of state of a hypothetical ideal gas. It is a good approximation to the behaviour of many gases under many conditions, although it has several limitations. The ideal gas equation can be written as-

                       PV = nRT

where,

P = Pressure

V = Volume

T = Temperature

n = number of moles

Given,

Initial volume = 0.55 L

Initial Pressure = 1 atm

Final pressure = 0.9 atm

P₁V₁ = P₂V₂

1 × 0.55 = 0.9 × V₂

V₂ = 0.61 L

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The freezing point of the solution is approximately 1.7°C lower than the normal freezing point of liquid X (3.4 °C).

Given values: Normal freezing point of liquid X (ΔTf°) = 3.4°C;

Freezing point depression constant (Kf) = -4.70; Sodium chloride (NaCl) mass (m2) = 27.2 g; Solvent liquid X mass (m1) = 500 g;

The freezing point of the solution can be found using the formula below:ΔTf = Kf . m2 / (m1 + m2)Substituting the given values into the formula, we have:ΔTf = (-4.70 °C . kg / mol) x (27.2 g / 58.44 g / mol) / (0.5 kg + 0.0272 kg)≈ -1.71 °C

Therefore, the freezing point of the solution is approximately 1.71°C lower than the normal freezing point of liquid X (3.4 °C). Therefore, the freezing point of the solution is:3.4 °C - 1.71 °C = 1.69 °C.Rounding off to two significant figures, the final answer is:1.7 °C

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Fe(CH3COO)3(aq) + PbBr2(s)

When FeBr3(aq) and Pb(CH3COO)2(aq) are mixed together, a double displacement reaction occurs and the positive ions (Fe3+ and Pb2+) and negative ions (Br- and CH3COO-) switch partners to form two new compounds. The formulas of the products can be predicted using the following steps:

1. Write the cation (+) and anion (-) for each reactant:

FeBr3(aq) --> Fe3+(aq) + 3Br-(aq)

Pb(CH3COO)2(aq) --> Pb2+(aq) + 2CH3COO-(aq)

2. Identify the combination of cation and anion that will form a neutral compound (i.e. one with a total charge of zero).

Fe3+(aq) + 2CH3COO-(aq) --> Fe(CH3COO)2(s)

Pb2+(aq) + 3Br-(aq) --> PbBr3(s)

Therefore, the predicted formulas of the products are Fe(CH3COO)2 and PbBr3. However, it is important to balance the equation to ensure that the law of conservation of mass is obeyed.

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The powder used to form an acrylic nail is a polymer powder, therefore the correct answer is (a) polymer.

When forming acrylic nails, a mixture of liquid monomer and polymer powder is used. The liquid monomer reacts with the polymer powder to create a pliable substance that can be shaped onto the natural nail or a nail form. As the substance dries, it hardens into a durable acrylic nail. While both the liquid monomer and polymer powder are necessary for creating acrylic nails, the powder is the key ingredient that provides the bulk of the material and the structure of the nail.

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Answer:

q2

Explanation:

Both the reactants are gases at STP.

Equation:

2H2S + 302 → 2SO2 + 2H2O

As per this equation 2 moles (2 x 22.4 L) of H2S

need 3 moles (3 x 22.4 L) of oxygen for their

complete oxidation.

So, volume of oxygen needed for 2.8 L of H2S =

(2.8 x 3 x 22.4)/(2 x 22.4) = 4.2 L (answer)

(a) H₂O(g) represents water in the gaseous state. It is produced as a product of the reaction between hydrogen sulfide (H₂S) and oxygen (O₂).

Gaseous state refers to a substance existing as a gas. When a substance is in the gaseous state, its particles are not closely packed together like in a solid or liquid state. Instead, they are spread out and move freely, filling the available space.

(b) To calculate the volume of oxygen required to react with 50 cm³ of hydrogen sulfide, we need to use the stoichiometry of the reaction. From the balanced equation, we can see that the molar ratio between hydrogen sulfide (H₂S) and oxygen (O₂) is 2:3.

Given: Volume of hydrogen sulfide (H₂S) = 50 cm³

Using the molar ratio, we can set up the following proportion: 2 mol H₂S / 3 mol O₂ = 50 cm³ H₂S / x cm³ O₂

To find the volume of oxygen, we can solve for x:

x = (50 cm³ H₂S * 3 mol O₂) / 2 mol H₂S

Now, we need to convert the obtained moles of oxygen to volume using the ideal gas law. Since the volume is given in cm³, we can assume that the temperature and pressure are constant at standard conditions (typically 0°C and 1 atm).

Using the ideal gas law equation: PV = nRT

Assuming constant temperature and pressure, we can rearrange the equation as: V = (n * R * T) / P

Substituting the values: V = (moles of O₂ * 22.4 L/mol) / (1 atm)

Calculate the moles of O₂ using the obtained value from the proportion.

Finally, convert the volume from liters to cm³ by multiplying by 1000.

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Magnesium + Sulfuric acid → Magnesium sulfate + Hydrogen

When magnesium reacts with sulfuric acid, it forms magnesium sulfate and hydrogen gas. This can be represented by the word equation: magnesium + sulfuric acid → magnesium sulfate + hydrogen.

In this reaction, the magnesium (Mg) reacts with the sulfuric acid (H₂SO₄) to produce magnesium sulfate (MgSO₄) and hydrogen gas (H₂).

The magnesium displaces the hydrogen from the acid, resulting in the formation of magnesium sulfate.

The hydrogen gas is released as a byproduct.

The reaction between magnesium and sulfuric acid is an example of a single displacement reaction. It is also an example of a metal-acid reaction.

The magnesium metal donates two electrons to the hydrogen ions in the acid, which allows the hydrogen to be released as a gas. The sulfate ion combines with the magnesium to form magnesium sulfate, which is a salt.

This reaction is exothermic, meaning it releases heat energy. It is important to carry out such reactions in a controlled manner due to the potential release of hydrogen gas, which is flammable.

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Since the exact values of the service times are not provided, it is not possible to calculate the 3-sigma control limits. Therefore, the correct answer is "None of the other options."

The 3-sigma control limits are used in statistical process control to determine the acceptable range of variation in a process. To calculate the 3-sigma control limits, we need to first find the mean and standard deviation of the service times for the 20 randomly selected customers.

Step 1: Find the mean (average) of the service times.
Add up all the service times and divide by the total number of customers (20).

Step 2: Find the standard deviation of the service times.
Calculate the difference between each service time and the mean, square each difference, sum up all the squared differences, divide by the total number of customers (20), and then take the square root of the result.

Step 3: Calculate the 3-sigma control limits.
Multiply the standard deviation by 3 and add/subtract the result to/from the mean. This will give you the upper and lower control limits.

Since the exact values of the service times are not provided, it is not possible to calculate the 3-sigma control limits. Therefore, the correct answer is "None of the other options."

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1.47 × 10²¹ molecules OF₂

Math

Pre-Algebra

Order of Operations: BPEMDAS

Chemistry

Atomic Structure

Stoichiometry

Step 1: Define

0.132 g OF₂

Step 2: Identify Conversions

Avogadro's Number

Molar Mass of O - 16.00 g/mol

Molar Mass of F - 19.00 g/mol

Molar Mass of OF₂ - 16.00 + 2(19.00) = 54.00 g/mol

Step 3: Convert

Step 4: Check

Follow sig fig rules and round. We are given 3 sig figs.

1.47204 × 10²¹ molecules OF₂ ≈ 1.47 × 10²¹ molecules OF₂

Answer:

someone already answered but i think it's 132.0 mol too

Answer:

5.60162×10^−3

Answer:

9.90

Explanation:

Given [H+] = 1.25 x 10^-10 M, we can calculate the pH using the formula:

pH = -log10([H+])

pH = -log10(1.25 x 10^-10)

Using logarithmic properties:

pH = -log10(1.25) - log10(10^-10)

Since log10(10^-10) is equal to -10:

pH = -log10(1.25) - (-10)

pH = -log10(1.25) + 10

Now, evaluating the logarithm using a calculator:

pH = -0.0969 + 10

pH = 9.9031

Therefore, the pH of the solution with [H+] = 1.25 x 10^-10 M is approximately 9.9031. Rounding it to two decimal places, the pH is approximately 9.90.

To prepare the pH 4.00 buffer solution, you should mix approximately 61.35 mL of the 0.100 M benzoic acid solution with 38.65 mL of the 0.240 M sodium benzoate solution.The ratio of benzoic acid to sodium benzoate in the buffer solution using the Henderson-Hasselbalch equation.

To prepare a pH 4.00 buffer solution using benzoic acid and sodium benzoate, we need to calculate the appropriate volumes of the 0.100 M benzoic acid and 0.240 M sodium benzoate solutions.

First, we need to determine the ratio of benzoic acid to sodium benzoate in the buffer solution. The Henderson-Hasselbalch equation can help us with this calculation:

pH = pKa + log([A-]/[HA])

Given that the pH is 4.00 and pKa is 4.20, we can rearrange the equation:

log([A-]/[HA]) = pH - pKa

log([A-]/[HA]) = 4.00 - 4.20

log([A-]/[HA]) = -0.20

Next, we take the antilog of -0.20 to find the ratio of [A-] to [HA]:

[A-]/[HA] = antilog(-0.20)

[A-]/[HA] = 0.63

The ratio of [A-] to [HA] is 0.63.

Now, let's calculate the volumes of each solution needed. Let's assume x represents the volume (in mL) of the 0.100 M benzoic acid solution and y represents the volume (in mL) of the 0.240 M sodium benzoate solution.

Since the total volume is 100.0 mL, we have the equation: x + y = 100

Considering the ratio of [A-] to [HA] as 0.63, we can write the equation: y/x = 0.63

Solving these two equations simultaneously will give us the volumes of each solution:

x + y = 100

y/x = 0.63

By substituting y = 0.63x from the second equation into the first equation, we get:

x + 0.63x = 100

1.63x = 100

x = 61.35 mL (rounded to two decimal places)

Substituting this value back into the equation x + y = 100, we find:

61.35 + y = 100

y = 38.65 mL (rounded to two decimal places)

Therefore, to prepare the pH 4.00 buffer solution, you should mix approximately 61.35 mL of the 0.100 M benzoic acid solution with 38.65 mL of the 0.240 M sodium benzoate solution.

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Answer:

2.25 moles H2

Explanation:

The equation N2+ 3H2 > 2NH3

1 mol of N2 gives 3 mol of H2

Then

. 75 mole N2 give 3*.75 = 2.25 moles of H2

Answer:

Its southeast

Explanation:

Answer:

southeastt

Explanation:

Answer:

positive

Explanation:

Explanation:

A proton has positive charge ...

The atomic number represents the number of protons, whereas the mass number represents the quantity of protons and neutrons. The number of protons equals the amount of electrons.

The atomic number is the number of protons. The number of neutrons may be calculated by subtracting the number of protons from the atomic mass, which is then rounded to the closest whole number.

For neutrally charged species, the number of electrons in an atom equals the atomic number of an element. This signifies that the number of electrons and protons in an element are equal. As a result, the number of electrons in oxygen is eight.

The number of valence electrons in neutral atoms equals the atom's main group number. A periodic table column can be used to determine an element's main group number. Carbon, for example, belongs to group 4 and contains four valence electrons.

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Answer:

B. Lindsay measures the sizes of the craters on the moon

Answer:

I think it's D but it's my (viewpoint)

Answer:

D = 2

2H₂0 → 2H₂ + O₂

Explanation:

I'll assume that "DH₂0-DH₂ + O₂" is meant to read:

   DH₂0 → DH₂ + O₂

Water decomposes into oxygen (O2) and hydrogen (H2) molecules.

We are to find a vale of D that will balance this equation.

        DH₂0 → DH₂ + O₂

Count the atoms on both sides of the equation, assuming D is 1 at this point:

 (D = 1)

 Element  Reactant  Product Balanced?

       H            2               2            Yes

       O            1                2            No

We need an additional oxygen atom on the reactant side, so lets try D=2:

2H₂0 → 2H₂ + O₂

 Element  Reactant  Product Balanced?

       H            4               4           Yes

       O            2               2           Yes

The equation is balanced for D = 2:

2H₂0 → 2H₂ + O₂

Answer:

The periodic table is a tabular array of the chemical elements organized by atomic number, from the element with the lowest atomic number, hydrogen, to the element with the highest atomic number, oganesson. The atomic number of an element is the number of protons in the nucleus of an atom of that element.

Other liquids can be utilized in a barometer, mercury is the maximum not unusual. Its density allows the vertical column of the barometer to be of possible size. If water had been used, for example, the column would be 34 ft high.

Mercury is greater dense. Its relative density is 13.534 times that of water. So, to measure the atmospheric pressure, that's 760 mm of mercury you want a barometer, with mercury, of a period barely greater than zero. seventy-six meters, say one meter to cowl the unique instances of some higher pressure.

If you use water, you need to have the length of the barometer of the period (or top) thirteen.534 times the duration of a mercury barometer, which may be greater than eleven meters in a period. Further mercury, being metallic has a shining nice which highlights its studying clean.

Additionally mercury, having comparatively decrease unique heat and the right conductor of warmth, could come to the equal temperature of the environment more quickly.

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Answer:

4.9 m^3

Explanation:

volume= 1.0 x 3.25 x 1.50= 4.875 -> 4.9m^3

Answer:

C

Explanation: