How many grams of Br are in 25 g CaBr2

Answer:

Nose or Mouth

Nasal Cavity

Trachea

Bronchi

Alveoli

Capillaries

Bronchioles

Diaphragm

Answer:

Therefore the theoretical density of iron is 7.877 g/cm³ .

Therefore the number of vacancy per cm³ is

Explanation:

Answer: The new molarity is 2.4 M

Explanation:

According to the dilution law,

\(C_1V_1=C_2V_2\)

where,

\(C_1\) = concentration of pure solution = 3 M

\(V_1\) = volume of pure solution = 200 ml

\(C_2\) = concentration of diluted solution= ?

\(V_2\) = volume of diluted solution= 250 ml

Putting in the values:

\(3M\times 200ml=M_2\times 250ml\)

\(M_2=2.4M\)

Thus the new molarity is 2.4 M

Answer:

Explanation:

The question requires us to calculate the amount of energy absorbed by the reaction, considering the molar enthalpy for oxygen gas (O2) and that 80.6 g of oxygen were reacting.

The following information was provided by the question:

Balanced chemical reaction:

Molar enthalpy of reaction for O2: +499.0 kJ/mol

Mass of O2 reacting: 80.6 g

To solve this problem, we need to calculate the amount of moles that corresponds to the mass of O2 given and then use this value and the molar enthalpy provided to calculate how much heat would be absorbed by the reaction.

First, we need the molar mass of O2. Knowing that the atomic mass of O is 15.99 u:

molar mass (O2) = (2 * 15.99) = 31.98 g/mol

Now, we use the molar mass to calculate the number of moles in 80.6 g of O2:

31.98 g O2 ------------------------ 1 mol O2

80.6 g O2 ------------------------- x

Solving for x, we'll have:

There are 2.52 moles of O2 reacting and next we need to calculate the amount of heat absorbed considering this.

The molar enthalpy of O2 tells us how much heat is abosrbed when 1 mol of O2 reacts. Thus, we can use it to calculate the amount of heat absorbed when 2.52 moles of O2 react:

1 mol O2 ----------------------- 499.0 kJ

2.52 mol O2 ----------------- y

Solving for y, we'll have:

Therefore, 1257.5 kJ of energy are absorbed when 80.6 g of O2 are reacting.

We can fill in the boxes to answer the question as it follows:

Answer: 1257.5

Units: kJ

Answer:

D.) mole, 6.022 x 10²³

Explanation:

Avogadro's Number is a ratio which states that there are 6.022 x 10²³ particles per every one mole.

Their Net profit is  $75,000.

Net profits is synonymous with profit since it represents the final measure of profitability for an employer. internet profits are also referred to as internet income because it represents the net quantity of earnings closing in any case prices and charges are subtracted from sales.

Gross profit is the income this is left after production charges have been subtracted from revenue and help investors determine how an awful lot income a company earns from the production and sale of its products. by using evaluation, net income, or net earnings, is the income this is left in any case costs and fees had been removed from sales. It allows displaying of an organization's average profitability, which displays the effectiveness of an enterprise's management.

received amount of past month =  $300,000

Operating cost = $125,000

Gross profit = $200,000

Therefore, net profit = $200,000 - $125,000

                                  =   $75,000

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Answer:

HOPE THIS HELPED :) good luck! ❤️

Explanation:

A reactant is a substance that is present at the start of a chemical reaction. The substance to the right of the arrow are called products . A product is a substance that is present at the end of a chemical reaction.

Answer:

Reactants are the starting substances and products are the ending substances in a chemical reaction.  The atoms in reactants are arranged one way and are rearranged in a different way to form the products (in other words, reactants are chemically different from products). The properties of reactants differ from the properties of products.

Explanation:

Sample response on Edge 2021

potassium hydrogen carbonate

The boiling point of water is 100.0 °C, the boiling point of the solution will be : 101.49 °C.The correct answer is option (a) 100.00049 °C.

Ideal Solution : An ideal solution is a homogeneous mixture of two or more components that obeys Raoult's law, which states that each component's vapor pressure is proportional to its mole fraction.The boiling point of a solution depends on the solvent's properties and the solute's concentration. It's dependent on the mole fraction of the solvent and solute, as well as the total concentration of the solution. The change in boiling point of a solution is given byΔTb = Kb × m × i, whereKb = ebullioscopic constant, m molarity of the solution, and i = van't Hoff factor.Assuming that the solution's behavior is ideal, we may use the molality of the solution to compute the boiling point elevation of the solution.The molality of the solution is given by the following formula:m = (n₂ / m₂) ÷ (n₁ / m₁), where n is the number of moles, m is the mass, and the subscripts 1 and 2 refer to water and non-volatile solute sucrose, respectively.The molar mass of sucrose (C₁₂H₂₂O₁₁) is342.3 g/mol; therefore, the number of moles of sucrose is115.0 g ÷ 342.3 g/mol = 0.335 mol.m₁ = mass of water = 350.0 g, and m₂ = mass of sucrose = 115.0 g, as given in the problem.Therefore, the molality of the solution is given by:m = (0.335 mol / 0.115 kg) ÷ (1 mol / 1 kg) = 2.91 mol/kg.Substituting these values in the formula for ΔTb, we get:ΔTb = Kb × m = 0.512 °C m⁻¹ × 2.91 mol/kg = 1.49 °C.100.0 °C + 1.49 °C = 101.49 °C.

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The balanced chemical equation for the reaction is: H2SO4 + 2KOH → K2SO4 + 2H2O. It can be concluded that the basicity of tetraoxosulphate VI acid is 2.

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Answer:

2.41 molecules.

Explanation:

hope this helps!

Answer:

Okyu

Explanation:

Mass of Zn = 65

(NO3)2 = 124

\(65 + (14 + 16 \times 2) \times 2 \\ 65 + 124 \\ = 184g mol\)

Explanation:

Mass of Zn = 65

(NO3)2 = 124

\begin{gathered}65 + (14 + 16 \times 2) \times 2 \\ 65 + 124 \\ = 184g mol\end{gathered}

65+(14+16×2)×2

65+124

=184gmol

The mass of \(H_2\) that will be formed when 35.25 g Al reacts with excess hydrochloric acid would be 3.93 g.

The equation of the reaction of aluminum metal with hydrochloric acid to produce hydrogen gas is represented below:

\(2Al + 6HCl -- > 2AlCl_3 + 3H_2\)

From the equation, one would see that the mole ratio of aluminum to the hydrogen gas produced is 2:3.

Now, with 35.25 g of aluminum, recall that: mole = mass/molar mass.

The molar weight of aluminum is 27 g/mol.

Thus:

Mole of 35.25 g Al = 35.25/27

                                = 1.31 mol

From the mole ratio, the mole of hydrogen that will be produced would be:

3/2 x 1.31 =1.97 mol

The molar mass of \(H_2\) is 2 g/mol, the mass of 1.97 mol hydrogen gas can be calculated as:

Mass = mole x molar mass

         = 1.97 x 2

        = 3.93 grams

In other words, the amount of \(H_2\) that would be formed when 35.25 g All reacts with excess hydrochloric acid would be 3.93 g.

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The measurement of 0.03412 kg has 5 significant figures. Significant figures are used to provide an indication of the precision of a measurement and should be used when performing calculations.

Measurements are the numerical values used to quantify the size, amount, or extent of something. Measurements are used to describe physical attributes and characteristics, such as length, width, weight, height, area, volume, speed, temperature, pressure, force, energy, power, and time. Measurements are also used to determine the amount of a certain material that is needed for a given purpose, such as a recipe. Measurements are essential for scientific investigation, engineering, and other activities that require precision and accuracy.

The measurement of 0.03412 kg has 5 significant figures. Significant figures are the meaningful digits of a number that are important in providing information about the measurement. In this measurement, the 4 digits after the decimal point (3412) provide the precision of the measurement, and therefore are significant figures. The leading zero does not provide any additional precision and is not a significant figure. Therefore, the measurement of 0.03412 kg has 5 significant figures.

Significant figures are used to provide an indication of the precision of a measurement. For example, a measurement of 0.03412 kg has a precision of 0.00001 kg, which is greater than a measurement of 0.3412 kg, which has a precision of 0.0001 kg. The more significant figures a measurement has, the more precise it is.

Significant figures are also important in calculations. To ensure accuracy, all calculations should be done using the same number of significant figures as the measurements being used. For example, if two measurements, 0.03412 kg and 0.02384 kg, are used in a calculation, the result should be reported to 5 significant figures.

In conclusion, the measurement of 0.03412 kg has 5 significant figures. Significant figures are used to provide an indication of the precision of a measurement and should be used when performing calculations.

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The measurement of 0.03412 kg has 5 significant figures. Significant figures are used to provide an indication of the precision of a measurement and should be used when performing calculations.

Measurements are the numerical values used to quantify the size, amount, or extent of something. Measurements are used to describe physical attributes and characteristics, such as length, width, weight, height, area, volume, speed, temperature, pressure, force, energy, power, and time. Measurements are also used to determine the amount of a certain material that is needed for a given purpose, such as a recipe. Measurements are essential for scientific investigation, engineering, and other activities that require precision and accuracy.

The measurement of 0.03412 kg has 5 significant figures. Significant figures are the meaningful digits of a number that are important in providing information about the measurement. In this measurement, the 4 digits after the decimal point (3412) provide the precision of the measurement, and therefore are significant figures. The leading zero does not provide any additional precision and is not a significant figure. Therefore, the measurement of 0.03412 kg has 5 significant figures.

Significant figures are also important in calculations. To ensure accuracy, all calculations should be done using the same number of significant figures as the measurements being used. For example, if two measurements, 0.03412 kg and 0.02384 kg, are used in a calculation, the result should be reported to 5 significant figures.

In conclusion, the measurement of 0.03412 kg has 5 significant figures. Significant figures are used to provide an indication of the precision of a measurement and should be used when performing calculations.

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The complete question is as follows:

How many significant figure are in 0.03412​ kg?

The percent yield of the product is 83.20% if the beaker weighs 10.20 g, the dry substance in the beaker weighs 16.54 g, and the expected mass is 7.62 g.  

The percent yield of the product is given by:

\( \% = \frac{m_{e}}{m_{t}} \times 100 \)

Where:

\( m_{e}\): is the experimental mass

\( m_{t}\): is the theoretical mass = 7.62 g

We can obtain the experimental mass by substrating the mass of the beaker from the mass of the dry substance in the beaker.

\( m_{e} = (16.54 - 10.20) g = 6.34 g \)

Hence, the percent yield is:

\( \% = \frac{6.34}{7.62} \times 100 = 83.20 \% \)

Therefore, the percent yield of the product is 83.20%.

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I hope it helps you!  

Yes. Light from the sun can pull energy out of the ink, causing it to become visible

___________________________________

Sorry if wrong

According to molar concentration and mole concept, there are 0.1 mole of chloride ions in 250 mL of a 0.2 M magnesium chloride solution.

Molar concentration is defined as a measure by which concentration of chemical substances present in a solution are determined. It is defined in particular reference to solute concentration in a solution . Most commonly used unit for molar concentration is moles/liter.

In terms of moles, it's formula is given as molar concentration= number of moles /volume of solution in liters.

By substituting values in given formula, number of moles=0.2×0.250=0.05 moles .Now this values is subtracted from molar mass of magnesium chloride  that is 95.211-0.05=95.161 moles which is finally divided by 95.211=0.999 which is approximately 0.10 mole.

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Answer:

uhhh D  .-.

Explanation:

Answer:C

Explanation:

Answer:

2.31 \(m\) C₆H₁₂O₆

Explanation:

Hope this helps

The molality of a fructose will be 2.31 M.

The term "total moles of a solute present in a kilogram of a solvent" is used to describe molality. The terms "molality" and "molal concentration"

Molality can be determined by the formula:

Molality = solute (n) / solvent (w) Kg

Given data:

Mass of fructose = 12.9 g

Mass of solvent = 31.0 g

Now, put the value of given data in molality equation.

Molality = 12.9/180 × 31 × \(10^{-3}\)

Molality = 0.00231  × \(10^{-3}\)

Molality = 2.31 M

Therefore, the molality of a fructose will be 2.31 M.

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The substance begins to boil at 2750⁰C, the substance begins to melt at 1500⁰C, the temperature at which the substance is both a liquid and a gas at 2750⁰C, temperature is the substance both a solid and a liquid​ at 1500⁰C.

Heating curves are the graphical correlations between heat added to a substance. When viewed from a cooling perspective, ie. loss of heat, it is the cooling curve.

The gradient of the cooling curve is related to the heat capacity, the thermal conductivity of the substance, and the external temperature. The more heat is required to change the temperature of the substance, the slower it cools, so the smaller the gradient of the curve. The higher the thermal conductivity, the faster heat is transferred, so the faster the substance cools.

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At equilibrium, the number of moles of \(Cl_2\) (g) will be 0.2025 mol.

1: Write the balanced chemical equation:

\(C_O\)(g) + \(Cl_2\)(g) ⟶ \(C_OCl_2\)(g)

2: Set up an ICE table to track the changes in moles of the substances involved in the reaction.

Initial:

\(C_O\)(g) = 0.3500 mol

\(Cl_2\)(g) = 0.05500 mol

\(C_OCl_2\)(g) = 0 mol

Change:

\(C_O\)(g) = -x

\(Cl_2\)(g) = -x

\(C_OCl_2\)(g) = +x

Equilibrium:

\(C_O\)(g) = 0.3500 - x mol

\(Cl_2\)(g) = 0.05500 - x mol

\(C_OCl_2\)(g) = x mol

3: Write the expression for the equilibrium constant (Kc) using the concentrations of the species involved:

Kc = [\(C_OCl_2\)(g)] / [\(C_O\)(g)] * [\(Cl_2\)(g)]

4: Substitute the given equilibrium constant (Kc) value into the expression:

1.2 x \(10^3\) = x / (0.3500 - x) * (0.05500 - x)

5: Solve the equation for x. Rearrange the equation to obtain a quadratic equation:

1.2 x \(10^3\) * (0.3500 - x) * (0.05500 - x) = x

6: Simplify and solve the quadratic equation. This can be done by multiplying out the terms, rearranging the equation to standard quadratic form, and then using the quadratic formula.

7: After solving the quadratic equation, you will find two possible values for x. However, since the number of moles cannot be negative, we discard the negative solution.

8: The positive value of x represents the number of moles of \(Cl_2\)(g) at equilibrium. Substitute the value of x into the expression for \(Cl_2\)(g):

\(Cl_2\)(g) = 0.05500 - x

9: Calculate the value of \(Cl_2\)(g) at equilibrium:

\(Cl_2\)(g) = 0.05500 - x

\(Cl_2\)(g) = 0.05500 - (positive value of x)

10: Calculate the final value of \(Cl_2\) (g) at equilibrium to get the answer.

Therefore, at equilibrium, the number of moles of \(Cl_2\) (g) will be 0.2025 mol.

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Answer:A

Explanation:

1. \(^{222}Rn_{86}\) → \(^{218}Po_{84} + ^{4}He_{2}\)

What is a spontaneous decay?

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Answer: Ionic Compound

Explanation:

An ionic compound is formed when an element completely transfers its valence electron to another element. The element which donates the electron is known as electropositive element or the metal and the element which accepts the electrons is known as electronegative element or non metal.

A covalent compound is formed when an element shares its valence electron with another element. This bond is formed between two non metals.

Mercury flouride contain ionic bonds as it is made up of mercury metal and fllourine non metal.

From the available choices, Heterogeneous combinations make up potting soil.

In heterogeneous blends, we can easily discern between the various components. The soil's components make up a heterogeneous mixture since they don't all have the same physical and chemical properties.

It's a great idea to grow indoor and potted plants in potting soil. It is typically more nutritious and well-balanced for the plants. The phrase "soil heterogeneity" refers to the diversity of soil traits or taxonomic groupings found in a certain area. Potting soil is a heterogeneous mixture since its composition is not homogeneous.

Tap water is uniform and impossible to identify salt particles without the proper equipment since salt virtually completely dissolves into it.

Chlorine gas (Cl) is a component of homogeneous compounds. Potassium and chlorine are a mixture because all of the components are heterogeneous, or separate.

Table salt is a homogeneous mixture. It contains several ingredients, hence it is not a compound.

The only heterogeneous substance would be potting soil since, without the use of specialist equipment, we can see a variety of particles with different sizes, forms, colors, and other properties.

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The octet rule is the understanding that most atoms seek to gain stability in their outer most energy level by filling the s and p orbitals of the highest energy level with eight electrons.

Nitrogen has an electron configuration of 1s²2s²2p³ this means that nitrogen has five valence electrons 2s²2p³ .

Nitrogen seeks out three additional electrons to fill the p orbital and gain the stability of a noble gas, 1s²2s²2p⁶ .

However, now nitrogen has 10 electrons and only 7 protons making it a -3 charge anion

N−³.

To determine the maximum \(Fe_2(SO_4)_3\) produced, we find the limiting reactant (Fe), calculate theoretical yield (0.3383 mol), and obtain a percentage yield of 47.56%.

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Hello, this is Bing. I can help you with your question. Based on the information I found on the web, **H2** can be broken down into its two atoms of hydrogen (H) by supplying enough energy to overcome the bond that holds them together⁴. This process is called **dissociation** and requires an energy equal to or greater than the **dissociation energy** of H2, which is about 436 kJ/mol⁴.

One way to break down H2 is by using **electricity** to split water (H2O) into hydrogen (H2) and oxygen (O2) through a process called **electrolysis**¹. In this process, water is decomposed into its elements by passing an electric current through it. The electric current is provided by a battery or another source of electricity and the water needs to have an **electrolyte**, such as salt or acid, added to it to make it conductive¹. Two electrodes, usually made of metal or other conductive material, are inserted into the water and connected to the battery. The electrode connected to the positive terminal of the battery is called the **anode** and the one connected to the negative terminal is called the **cathode**¹. When the electric current flows through the water, hydrogen gas bubbles form at the cathode and oxygen gas bubbles form at the anode¹. The overall chemical reaction for electrolysis of water is:

2 H2O → 2 H2 + O2

Another way to break down H2 is by using **heat** to cause a reaction between hydrogen and oxygen that produces water and releases a large amount of energy. This reaction is called **combustion** or **oxidation** and can be ignited by a spark or a flame³. The reaction is very fast and explosive and can be dangerous if not controlled. The overall chemical reaction for combustion of hydrogen is:

2 H2 + O2 → 2 H2O

I hope this helps you understand how H2 can be broken down and what methods are used to do so.

Answer:

How many moles KCl in 1 grams? The answer is 0.013413582325

1 mole is equal to 1 moles KCl, or 74.5513 grams.

447.3078 is the answer

Explanation:

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