#8 explain and answer

Solution :

For the reaction given :

\($\text{2Hg}_{(l)}+\text{O}_2_{(g)} \rightarrow \text{2HgO}_{(s)}$\)

Thus we know that the equilibrium constant \($K_c$\) contains aqueous an dgas species only.

∴       \($K_c=\frac{1}{[O_2]}$\)    ............(1)

Now at the equilibrium, an amount of the 13.4 g of oxygen was found in the vessel of 6.9 liters. For determining the concentration of the oxygen gas, we use :

\($[O_2]= \frac{n_{O_2}}{V_{soln}}$\)  ...................  (2)

Here, \($n_{O_2}$\) = no. of moles of oxygen gas (mol)

         \($V_{soln}$\) = volume of solution (L)

Therefore the number of moles of the oxygen gas is calculated by directly using the molecular weight (31.9988 g/mol) as the conversion factor.

∴      \($n_{O_2}= 13.4 \ g \times \frac{\text{1 mol}}{31.9988 \ g}$\)

              = 0.418 mol

Now substituting the known values in (2), we can find the equilibrium concentration of the oxygen gas :

\($[O_2] =\frac{0.418 \ \text{mol}}{6.9 \ \text{L}}$\)

     = 0.0605 M

Therefore substituting the result in (1), the equilibrium constant for the reaction is :

\($K_c=\frac{1}{0.0605}$\)

    = 16.52

The observation of a smaller outside hole than inside leads Becca to infer that an impact from the outside caused the hole, with a larger object striking and passing through the window from the inside.

From the observation that the hole in the window is smaller on the outside than on the inside, Becca, as a forensic technician, might deduce the following:

The hole was caused by an impact from the outside: The smaller outside hole suggests that the force that created the hole originated from the outside and exerted more pressure on the window surface facing inward.

The object causing the hole was larger on the inside: The discrepancy in hole sizes implies that the object that struck the window had a larger size or diameter on the inside, and as it penetrated the glass, it compressed or fragmented the glass, resulting in a larger hole on the inside.

The object may have passed through the window: The difference in hole sizes indicates that the object may have penetrated the window, potentially passing through to the inside. This could suggest a break-in or an incident involving the window being struck from the outside.

Overall, the observation of a smaller outside hole than inside leads Becca to infer that an impact from the outside caused the hole, with a larger object striking and passing through the window from the inside.

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Approximately 4.37 x 10^23 molecules of HCl would be required to form 34.52 g of MgCl₂.

To determine the number of molecules of HCl required to form 34.52 g of MgCl₂, we need to use the molar mass and stoichiometry of the balanced equation:

Mg(OH)₂(s) + 2 HCl(aq) → 2 H₂O(l) + MgCl₂(aq)

The molar mass of MgCl₂ is 95.21 g/mol.

First, we need to calculate the number of moles of MgCl₂ formed:

Moles of MgCl₂ = mass of MgCl₂ / molar mass of MgCl₂

Moles of MgCl₂ = 34.52 g / 95.21 g/mol

Moles of MgCl₂ = 0.363 mol

According to the balanced equation, the stoichiometric ratio between HCl and MgCl₂ is 2:1. Therefore, the moles of HCl required can be calculated as follows:

Moles of HCl = 2 * Moles of MgCl₂

Moles of HCl = 2 * 0.363 mol

Moles of HCl = 0.726 mol

To calculate the number of molecules, we need to use Avogadro's number, which is approximately 6.022 x 10^23 molecules/mol.

Number of molecules of HCl = Moles of HCl * Avogadro's number

Number of molecules of HCl = 0.726 mol * 6.022 x 10^23 molecules/mol

Number of molecules of HCl = 4.37 x 10^23 molecules

Therefore, approximately 4.37 x 10^23 molecules of HCl would be required to form 34.52 g of MgCl₂.

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Answer: The answer is incus

Properties of matter which are involved in floating the boats are density and volume as less dense materials present in boats will enable it to float on water.

Matter in chemistry, is defined as any kind of substance that has mass and occupies space that means it has volume .Matter is composed up of atoms which may or not be of same type.

Atoms are further made up of sub atomic particles which are the protons ,neutrons and the electrons .The matter can exist in various states such as solids, liquids and gases depending on the conditions of temperature and pressure.

The states of matter are inter convertible into each other by changing the parameters of temperature and pressure.

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Answer:

A. the muscles in her leg relax and contract to move the bones (is the answer)

Explanation:

Answer:

C2H2 + Br2 → C2H2Br2

Explanation:

The alcohol product of the reduction of 2-methyl3-pentanone with  1. LiAlH₄ diethyl ether 2. H₂O is B ) racemic mixture.

The reduction of the 2 - methyl-3- pentanone with the LiAlH₄  diethyl ether is given as follows :

                                    1. LiAlH₄ diethyl ether

CH₃ - CH - C - CH₂ -CH₃   ---------------->               CH₃ - CH₂ - CH - CH₂ -CH₃

          |       ||                        2. H₂O                                  |          |

        CH₃   O                                                                  CH₃    OH

2 - methyl-3- pentanone                                       2 - methyl-3- pentanol

This compound is the optically inactive and thus, form the racemic mixture. the optically inactive means it does not rotate the plane polarized light.

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Answer:

283549.68 J

Explanation:

From the question given above, the following data were obtained:

Mass (M) = 2.7 Kg

Initial Temperature (T₁) = 5.4 °C

Final temperature (T₂) = 30.5 °C

Specific heat capacity (C) = 4184 J/KgºC

Heat (Q) =?

The amount of heat energy needed can be obtained as follow:

Q = MC(T₂ – T₁)

Q = 2.7 × 4184 × (30.5 – 5.4)

Q = 11296.8 × 25.1

Q = 283549.68 J

Thus, the heat energy needed is 283549.68 J

The diameter of the spherical nucleus of hydrogen-1 atom is 1 x 10^-13 cm. The density (g/cm3) of matter in a proton of mass of proton is 1.673 x 10^-24 is 3.193 × 10¹⁵ g/cm³.

The density of a substance is its mass per unit volume. The most common symbol for density is, but the Latin letter D can also be used. Density is defined mathematically as mass divided by volume.

Diameter = 1 x 10⁻¹³ cm

Mass = 1.673 x10⁻²⁴ g

Volume = 4/3πr³

Volume = 4/3 × 22/7 × (1 × 10⁻¹³ / 2)³

Volume = 11 × 10⁻³⁹ / 21

Density = Mass / Volume

           = 1.673 x10⁻²⁴ / 11 × 10⁻³⁹ / 21

Density = 3.193 × 10¹⁵ g/cm³

Thus, the density (g/cm3) of matter in a proton of mass of proton is 1.673 x 10^-24 is 3.193 × 10¹⁵ g/cm³.

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From the specific heat capacity of mercury, the amount of heat energy required to raise the temperature of 4.0 g of mercury metal from 9.3 °C to 83.0 °C is 77.792 J.

The specific heat capacity of a substance is the amount of heat required to raise the temperature of a unit mass of the substance by one degree Celsius or kelvin.

The specific heat capacity of a substance is a constant that can be used to calculate the amount of heat required to raise the temperature of a given mass of a substance to any temperature.

The specific heat capacity of mercury is 0.140 J/g/k.

The formula for calculating specific heat capacity is given below:

Specific heat capacity, c = Δq/mΔT

where;

Δq = heat change

m = mass of the substance

ΔT = temperature change

The Heat required, Δq, will then be:

Δq = m * c * ΔT

Heat required, Δq = 4.0 * 0.140 * (83.0 - 9.3)

Heat required, Δq = 77.792 J

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Answer:

i think its 10 miles per hour

Answer:

A) 3.6 cm

Explanation:

Accuracy comes down to how precisely you can read the length on a given scale. Here since the smallest increment is centimeter, we can go only one decimal beyond to estimate. This is because you can usually estimate to only one decimal place beyond the closest marks on any measuring.

So, the answer should be 3.6 cm.

Here's a document that explains it well: https://www.auburn.wednet.edu/cms/lib03/WA01001938/Centricity/Domain/1360/1_Uncertainty.pdf

Hope that's right!

Answer:

ang hirap na nag tanung

Answer:

The volume of Component 1 is 36 cubic inches.

Explanation:

To calculate the volume of a composite solid, we need to determine the individual volumes of the different components and then add them together.

In this case, the composite solid consists of multiple components with the following dimensions:

Component 1:

Length: 4 inches

Width: 3 inches

Height: 3 inches

To find the volume of Component 1, we multiply the length, width, and height together:

Volume of Component 1 = Length x Width x Height = 4 in x 3 in x 3 in = 36 cubic inches

Therefore, the volume of Component 1 is 36 cubic inches.

Please provide the dimensions of the remaining components of the composite solid, and I will calculate the total volume by summing up the individual volumes.

The bonds between the atoms of an item or substance store elastic energy. When these bonds are under stress, they absorb energy and release it when they are relaxed.

Elastic energy is the mechanical potential energy held in a material's or a physical system's configuration while it is subjected to elastic deformation as a result of work being done on it.

Elastic energy is created when things are momentarily crushed, stretched, or otherwise distorted. Calculations of mechanical equilibrium locations using the elastic potential energy equation.

The energy is potential because when the item is permitted to return to its original shape by its elasticity, it will change into other types of energy, such as kinetic energy and sound energy.

Thus, The bonds between the atoms of an item or substance store elastic energy.

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Answer:

Explanation:

Atmospheric pressure = partial pressure of nitrogen + partial pressure of oxygen + partial pressure of argon + partial pressure of trace element

putting the given values

Atmospheric pressure = 592 + 160 + 7 + 1

= 760 mm of Hg .

Answer:

\(\left[\begin{array}{cccc}CO_{2}&0.717g&0.0163&9.82(10)^{21}\\CO&0.6g&0.0158&9.51(10)^{21}\\BrI&22.6mg&0.000109&6.58(10)^{19}\\CF_{2}Cl_{2}&1.36kg&11.2&6.77(10)^{24}\end{array}\right]\)

Explanation:

m = mass (g)

n = number of moles (mol)

Mr = formula mass = sum of the atomic masses of all atoms (found on the periodic table) in a molecule

A = Avogadro's constant = 6.022 × 10²³

m = n × Mr

Number of molecules = n × A

1g = 1000mg

CO₂:

n = 0.0163

Mr = 12 + 2(16) = 44

m = 0.0163 × 44 = 0.7172 → 0.717g

Number of molecules = 0.0163 × (6.022 × 10²³) = 9.81586 × 10²¹ → 9.82 × 10²¹

CO:

n = 0.0158

Mr = 12 + 16 = 38

m = 0.0158 × 38 = 0.6004 → 0.6g

Number of molecules = 0.0158 × (6.022 × 10²³) = 9.51476 × 10²¹ → 9.51 × 10²¹

BrI:

m = 0.0226

(22.6mg = 0.0226g)

Mr = 79.9 + 126.9 = 206.8

0.0226 = n × 206.8

\(n = \frac{0.0226}{206.8} \\\\ n = 0.000109284...\) → 0.000109mol

Number of molecules = 0.000109284... × (6.022 × 10²³) = 6.58110... × 10¹⁹ → 6.58 × 10¹⁹

CF₂Cl₂:

m = 1360

(1.36kg = 1360g)

Mr = 12 + 2(19.0) + 2(35.5) = 121

1360 = n × 121

n = ¹³⁶⁰/₁₂₁

n = 11.2396... → 11.2mol

Number of molecules = 11.2396... × (6.022 × 10²³) = 6.7685... × 10²⁴ → 6.77 × 10²⁴

Answer:

0.422 M

Explanation:

Equation of the reaction,

2HCl(aq) + Ba(OH)₂(aq) ⇒ BaCl₂(aq)+2H₂O(l)

From the recation above,

2 moles of HCl is needed to neutralize 1 mole of Ba(OH)₂.

Using,

C'V'/CV = a/b......................... Equation 1

Where C' = concentration of acid, C = concentration of base, V' = volume of acid, V = volume of base, a = number of moles of acid, b = number of moles of base.

make C' the subject of the equation.

C' = aCV/bV'................. Equation 2

a = 2 mole, b = 1 mole, C = 0.0154 M, V = 27.4 mL, V' = 20 mL

Substitute into equation 2

C' = (2×0.0154×27.4)/(1×20)

C' = 0.422 M.

Hence the concentration of acid is 0.422 M

Answer:

The moon

Explanation:

The moon pulls on the earth, causing the tides to raise as the water is being pulled by the moon.

Answer:

Dmitri Mendeleev=Russian chemist, Albert Ghiorso=American scientist

Explanation:

The amount of heat (in J) required for the temperature change is 26752 J.

The amount of heat required to raise the temperature of water from 25°C to 89°C is calculated as follows:

Mass of water = volume * density

density of water = 1 g/mL

volume of water = 100 mL

mass of water = 100 mL * 1 g/mL

mass of water = 100 g

heat capacity of water = 4.18 J/g°C

Temperature change = 89 - 25 = 64 °C

Heat required = 100 * 4.18 * 64

Heat required = 26752 J

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Answer:

C.) 42 grams NaOH

Explanation:

To find the mass of NaOH, you need to (1) find the moles (using the molarity equation) and then (2) convert moles to grams (using the molar mass).

(Step 1)

250.0 mL / 1,000 = 0.2500 L

Molarity = moles / volume (L)

4.2 M = moles / 0.2500 L

1.05 = moles

(Step 2)

Molar Mass (NaOH): 22.990 g/mol + 15.998 g/mol + 1.008 g/mol

Molar Mass (NaOH): 39.996 g/mol

1.05 moles NaOH           39.996 g
-----------------------------  x  ------------------  =  42 grams NaOH
                                           1 mole

5.00 g of potassium sulfide gas at STP. liters we you have is 112.

Per the UK's health service, adults should take in roughly 3,500mg of potassium daily. A healthy person can eat at least seven and a half bananas before consuming the advised amount of potassium because the typical banana, weighing 125g, provides 450mg of potassium.

Potassium should be a priority in a person's diet. The following foods are good sources of potassium: dried apricots, lentils, zucchini, prunes, potatoes, kidney beans, & bananas. The greatest potassium is present in apricots.

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Molecular polarity is important for life because it plays a crucial role in many biological processes.

Molecular polarity refers to the distribution of electrical charge within a molecule. It is a property that results from differences in the electronegativity of the atoms in a molecule.

Molecular polarity is important for life because many biological molecules, including proteins, DNA, and carbohydrates, are polar, meaning they have regions of positive and negative charge.

This allows them to interact with other polar molecules, such as water, through hydrogen bonding, which helps to stabilize their structures and maintain their functionalities.

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Answer:

12.93 atm

Explanation:

c xc xc xc

Actual yield is the definite mass of the product obtained from the reaction. The actual yield of the reaction is 24.83 gms.

Percentage yield is the proportion of the actual to the theoretical yield. The formula is given as,

% yield = Actual yield ÷ Theoretical yield × 100

The balanced chemical reaction is given as:

2 Na + Cl₂ → 2NaCl

From the reaction:

2 × 23 Na = 2 × 58.44 gm of NaCl

If, 1 gm of Na will produce = (2 × 58.44) ÷ (2 × 23)

Then, 11.50 gms sodium will produce, (2 × 58.44) ÷ (2× 23) × 11.50

= 29.22 g

So, the actual yield is calculated as:

= % yield × Theoretical yield ÷ 100

= 85 × 29.22 ÷ 100

= 24.83 g

Therefore, the actual yield of the reaction is 24.83 gms.

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Answer:24.83 g is actual yield

Explanation:

According to the stoichiometry, 4.85 g of propane is required to produce 14.7 g carbon dioxide.

It is the determination of proportions of elements or compounds in a chemical reaction. The related relations are based on law of conservation of mass and law of combining weights and volumes.

Stoichiometry is used in quantitative analysis for measuring concentrations of substances present in the sample.

In the given problem as per balanced equation of combustion of propane 2 molecules of propane produce  8 molecules of carbon dioxide.That is, 116.24 g of propane produces 352.08 g of carbon dioxide.

∴14.7 g of carbon dioxide is produced by, 14.7×116.24/352.08=4.85 g of propane.

Thus, 4.85 g of propane is required to produce 14.7 g of carbon dioxide.

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Answer:

The answer is (e) none of the above. The combined gas law relates the pressure, volume, and temperature of a gas, so all three variables (pressure, volume, and temperature) must be considered and at least one of them should be held constant to use the combined gas law. The mass of the gas sample, number of moles of gas, and number of gas molecules are not directly related to the combined gas law.