Given that 1 mile = 160934 cm, calculate the height of a stack of one mole of
pennies in miles. (Hint: begin the conversion with 1 mole of pennies.) Show your work.
The distance to the nearest star, Alpha Centauri, is 2.6 x 10^13 miles.

Answer:

i think its -91.6

Explanation:

2 ( - 950.8) - (( - 1130.7) + ( - 393.5) + ( - 285.8))

The standard enthalpy change for the given reaction is approximately 91.9 kJ mol⁻¹.

The heat produced during a chemical reaction under specific conditions is known as the standard enthalpy change, abbreviated as H° (zero delta H). Standard conditions often refer to all reactants and products in their standard states, which are their most stable forms at 298 K and 1 bar (or 1 atm) pressure.

Hess's law, which states that the total enthalpy change of a reaction is equal to the sum of the enthalpy changes of its component phases, is used to calculate the standard enthalpy change of the reaction.

The following reaction is given:

\(\rm 2 NaHCO_3(s)--- > Na_2CO_3(s)+ CO_2(g) + H_2O(l)\)

The relevant enthalpy changes of formation are:

ΔH°[NaHCO3(s)] = -950.8 kJ mol⁻¹

ΔH°[Na2CO3(s)] = -1130.7 kJ mol⁻¹

ΔH°[CO2(g)] = -393.5 kJ mol⁻¹

ΔH°[H2O(l)] = -285.8 kJ mol⁻¹

By using Hess's Law, the standard enthalpy change (ΔH°) for the reaction can be calculated as follows:

ΔH° = Σ (products) - Σ (reactants)

ΔH° = [ΔH°[\(\rm Na_2CO_3\)(s)] + ΔH°[\(\rm CO_2\)(g)] + ΔH°[H2O(l)]] - [2 × ΔH°[\(\rm NaHCO_3\)(s)]]

ΔH° = [-1130.7 kJ mol⁻¹ + (-393.5 kJ mol⁻¹) + (-285.8 kJ mol⁻¹)] - [2 × (-950.8 kJ mol⁻¹)]

ΔH° = [-1809.7 kJ mol⁻¹] - [-1901.6 kJ mol⁻¹]

ΔH° ≈ -1809.7 kJ mol⁻¹ + 1901.6 kJ mol⁻¹

ΔH° ≈ 91.9 kJ mol⁻¹

Hence, the standard enthalpy change for the given reaction is approximately 91.9 kJ mol⁻¹.

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The answers include the following:

1. Multiple lenses provide various magnifications is called compound microscope.

2. Provides support for the microscope is called base.

3. Used to sharpen image is called a fine adjustment knob.

4. Connects to a base is called an arm.

5. The flat platform where slides are placed is called a stage.

6. The lens you look through is called eyepiece lens.

This is referred to an instrument which is used to examine objects or organisms which are too small to be seen with the eyes.

It has different parts such as the stage where the specimens are placed for observation and so on.

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198 ml To create 4% NaOH, you will need 7.92 grammes of sodium hydroxide, or (4 x 198)/100. So, 7.92 grammes of sodium hydroxide are dissolved in 198 ml of water.

The molarity of a solution is decreased by dilution. An aqueous solution's volume grows with the addition of more water, while the solute's moles remain constant. As a result, the solution's concentration and molarity are reduced.

Dilution happens as the solution's volume increases. As just a result, conductivity decreases and ions per millilitre increase. The molar conductivity is calculated using one mole of ions. The molar conductivity of the solution rises as a result of increased ion separation and mobility.

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Answer:

false

Explanation:

The calories lost by 50 g of hot water starting at 90 degrees celsius is 265 cal.

Heat gained by cold water plus heat gained by the calorimeter equals the heat lost by hot water. The negative sign shows that the calorimeter and cold water are gaining heat, while the hot water calories is losing heat.

Water utilized has a mass of 50.0 g and a specific heat of 1.0 cal/g °C. The heat gained in calories will be provided by these figures. Q=m*C*T=50.0 g*1.0 cal/g°C*5.3 °C = 265 cal.

U value x Wall area x Delta T is the formula used to calculate the amount of heat loss via a wall in BTUs. In our illustration, this would be: 07 x 164 x 28

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At 824.1 torr + 55.9°C, dry butane has a of 0.937 L. The basic formula for size is length, breadth, and height, as volume opposed to length, width, and height for the surface of a rectangular shape.

Any three-dimensional solid's volume is the area it takes up. The shapes of these solids include cubes, cuboids, cones, cylinders, and spheres. Forms come in a wide range of volumes.

Volumes will be calculated using three different techniques: geometrically (measured lengths); water displace; and pycnometry, to demonstrate the effects of precision on data.

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The result obtained by converting 20 quibs of skvarnick to sleps, given that 5 quibs of skvarnick is equal to 3 sleps, is 12 sleps

We can convert quibs to sleps by using the following conversion scale:

5 quibs of skvarnick = 3 sleps

With the above conversion scale we can convert 20 quibs of skvarnick to sleps as illustrated below:

5 quibs of skvarnick = 3 sleps

Therefore,

20 quibs of skvarnick = (20 quibs × 3 sleps) / 5 quibs

20 quibs of skvarnick = 12 sleps

Thus, from the calculation made above, we can conclude that 20 quibs is equivalent to 12 sleps

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To begin with, sucrose is C12H22O11. Additionally, we must determine how many moles of sucrose there are in a pound of sucrose:

The moles of sucrose are 454g, 342.30g, mol1, and 1.33mol.

Is sucrose a good sugar to use?

Brief Summary According to a University of California, Davis study that was published in the Journal of Clinical Endocrinology and Metabolism, sucrose, the more "natural form of sugar," may be just as harmful to your health as HFCS.

Is sugar a healthy food?

Your body only receives sugar when you consume sucrose like soda or candy, and typically too much of it. The threat is present here. You run the risk of major health problems if you consume too much added sugar (fructose or sucrose) in your diet.

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The average atomic mass of copper can be calculated from the mass and percentage abundance of its isotopes. The average atomic mass of copper is 36.54 amu.

Isotopes are atoms of same element with different mass number. Isotopes slightly differ in physical and chemical properties from each other.

The average atomic mass of an element is calculated with the formula given below:

average atomic mass  = ∑ (% abundance /100) × isotopic mass.

mass of Cu-63 = 62.93 amu

% abundance = 69.15 %

mass of Cu-65 = 64.93 amu

% abundance = 30.85 %

Average atomic mass = (69.15 % /100 × 62.93 ) +  (30.85 % /100 × 64.93)

                                    = 63.54 amu.

Therefore, the average atomic mass of copper is 63.54 amu.

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Answer:

Element A and element D

Please make me brainliest!!

According to molar concentration, 0.7455 g of  KCl are needed to make 0.1 M KCl 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.

Molar concentration is calculated by the formula, molar concentration=mass/ molar mass ×1/volume of solution in liters.

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

Substituting values in 1st formula mentioned,mass=molarity×molar mass×volume in liters=0.1×74.55×0.1=0.7455 g.

Thus,0.7455 g of  KCl are needed to make 0.1 M KCl solution.

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In 1867, Otto von Bismarck created the Northern Confederation, a combination of the northernmost German states beneath Prussian rule.

The "Iron Chancellor," Otto von Bismarck (1815–1898), oversaw the unification and modernization of Germany. He virtually ruled Prussia and then all of Germany between 1862 until 1890. To unify the 39 autonomous German states under Prussian control, great strategist Bismarck launched decisive wars with France, Austria, & Denmark.

In 1864, Bismarck began the series of wars that'd make Prussia the most powerful country in Europe. He invaded Denmark to seize control of the German-speaking province of Schleswig-Holstein, and two years later he persuaded Emperor Franz-Josef I to start the Austria- War (1866), which brought about an immediate defeat for the faltering Austrian empire.

Thus, on 1867, Otto von Bismarck created the Northern Confederation, a combination of the northernmost German states beneath Prussian rule.

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Milk

Explanation:

because milk is very thick youknow here I go

The energy to launch the model spacecraft come from the spacecraft that is moving against the magnetic field.

The energy to launch the model spacecraft come from the spacecraft that is moving against the magnetic field. the called potential energy in the magnetic field is moving is used to move the magnet against the magnetic field. magnetic force can be converted into the potential energy in to the kinetic energy. An electric current is created by electromagnetic. it will create the model of magnetic system.

Thus, The energy to launch the model spacecraft come from the spacecraft that is moving against the magnetic field.

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The expression relating the concentration of a gas in \(\mu g/m^-^3 (X)\) with the concentration expressed in ppm (Y) is \(Y = (X/MW) * 10^6 / V\)

To derive an expression relating the concentration of a gas in \(\mu g/m^3 (X)\) with the concentration expressed in ppm (Y), we can use the ideal gas law. The ideal gas law states that \(PV = nRT\), where P is the pressure, V is the volume, n is the number of moles, R is the ideal gas constant, and T is the temperature. Rearranging the equation, we have \(n = PV/RT\)

To convert the concentration from \(\mu g/m^-^3 (X)\) to moles (n), we divide X by the molecular weight (MW) of the gas. Thus, \(n = X/MW\)

Combining the two equations, we have \(X/MW = PV/RT\)

Since the concentration expressed in ppm (Y) is the same as the number of moles per million parts of air, we can write \(Y = n * 10^6 / V\)

Substituting \(n = X/MW\), we get \(Y = (X/MW) * 10^6 / V\)

Therefore, the expression relating the concentration of a gas in \(\mu g/m^3 (X)\) with the concentration expressed in ppm (Y) is:

\(Y = (X/MW) * 10^6 / V\)

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Complete question is:

Using the ideal Gas Law, derive an expression relating the concentration of a gas \(\mu_g^-^3 (X)\) with the concentration expressed in ppm (Y). (10 pts) Hint:- Ideal gas law \(PV= nRt -R = 0.0821 atm mol^-^1\)  −MW=X= molecular weight

Answer:

2C3H6 + 9O2 => 6CO2 + 6H20

Explanation:

2C3H6 + 9O2 => 6CO2 + 6H20

C = 6

H = 12

O = 18

Answer:

The number of atoms is 6.83 grams of potassium is \(1.05\times 10^{23} atoms\).

Explanation:

Mass of the potassium element = 6.83 g

Atomic mass of potassium = 39.10 g/mol

Moles of potassium = \(\frac{6.83 g}{39.10 g/mol}=0.175 mol\)

According to mole concept :

1 mole = \(N_A=6.022\times 10^{23}  \) atoms/ions/ molecules

Total number of atoms of potassium in 0.175 moles:

\(=0.175 \times 6.022\times 10^{23}  =1.05\times 10^{23} atoms\)

So, number of atoms is 6.83 grams of potassium is \(1.05\times 10^{23} atoms\).

Answer:

The answer is " salt".

Explanation:

Hey there!

When any acids and base react with eachother, they forms water and respective salts.

For example:

HCl + NAOH = NACl + H2O.

Hope it helps!

the standard heat of combustion of propane is `-2220.1KJ mol^(-1)` .

Therefore, the wavelength of light absorbed when an electron is promoted from a lower energy d orbital to a higher energy d orbital in this copper complex is approximately 783 nm.

To calculate the wavelength of light absorbed, we need to use the formula:

ΔE = hc/λ

where ΔE is the energy difference between the two d orbitals, h is Planck's constant (6.626 x 10⁻³⁴ J s), c is the speed of light (2.998 x 10⁸ m/s), and λ is the wavelength of light.

The energy difference between the two d orbitals can be calculated using the crystal field splitting parameter:

ΔE = 0.256 x 10⁻¹⁸ J

Substituting these values into the equation, we get:

0.256 x 10⁻¹⁸ J = (6.626 x 10⁻³⁴ J s)(2.998 x 10⁸ m/s)/λ

Solving for λ, we get:

λ = (6.626 x 10⁻³⁴ J s)(2.998 x 10⁸ m/s)/(0.256 x 10⁻¹⁸ J)

λ = 7.83 x 10⁻⁷ m

= 783 nm

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Reason:- The Mechanism of Diffusion In the case of food coloring in water, the water is the solvent while the food coloring is the solute. Once they've mixed, they make a solution. Diffusion takes time, though how much time depends on the kinetic energy of the molecules randomly bouncing among each other.

How much energy is required to raise the temperature of 3 kg of aluminum from 18°C to 23°C? Use the table below and this equation: Q=mcΔT

Answer:

Option D, Index fossil helps scientists to determine the relative ages of rocks by their positions

Explanation:

Index fossils are arranged in layer in such a way that the lowest layer represent the oldest fossil and the top most layer represents the youngest fossil. Scientist use this concept to determine the relative age of the rocks based on their position beneath the earth’s surface

Hence, option D is correct

Answer:t changes from yellow at pH 3.0 to blue at pH 4.6; this reaction is reversible. Bromophenol blue is structurally related to phenolphthalein (a popular indicator).

...

Acid–base indicator.

Bromophenol blue (pH indicator)

below pH 3.0  above pH 4.6

Explanation:

Carbon dioxide (CO2) is produced during the process of alcohol fermentation, which is a metabolic process that converts sugar into alcohol and carbon dioxide in the absence of oxygen.

In alcohol fermentation, the conversion of glucose into ethanol and CO2 is carried out by yeast or other microorganisms.

During the initial stages of alcohol fermentation, the enzyme zymase breaks down glucose into pyruvate through a process called glycolysis. Pyruvate is then converted into acetaldehyde by the enzyme pyruvate decarboxylase.

This reaction releases CO2 as a byproduct. The acetaldehyde is then reduced to ethanol by the enzyme alcohol dehydrogenase. Thus, CO2 is produced during the decarboxylation of pyruvate into acetaldehyde, which is an important step in the process of alcohol fermentation.

The release of CO2 gas is often used to monitor the progress of fermentation in food and beverage production, such as in the making of beer and wine.

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Answer:

C. minerals within geodes are always framework silicates

Explanation:

This is true going by the facts that, it is only the silicates that can be able to form crystals as obtainable in diamonds etc. Since the minerals in geodes are in the framework of silicates families, they can be able to form euhedral crystals.

The reaction involving zinc metal immersed in a solution of copper ions is called a redox reaction.

Redox reaction is a kind of chemical reaction that includes a change in oxidation states of the elements in a chemical reaction. The word "redox" is made up of "reduction" and "oxidation."A reaction in which both reduction and oxidation take place is known as a redox reaction. When a substance loses one or more electrons, it is oxidized. The opposite of reduction is oxidation. An example of a redox reaction is the reaction between zinc metal immersed in a solution of copper ions.Copper ions take electrons from the zinc metal in the solution to become copper atoms in the solution. Zinc ions and copper atoms are created as a result of this. The reaction involving zinc metal immersed in a solution of copper ions is a redox reaction.

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