Calculate the molarity when 0.554 g NH3 is dissolved to make 15.0 mL solution.

A chemical formula that uses the smallest ratio feasible to display the proportional number of each type of atom in a molecule. Therefore, choice A is correct.

Chemical formulas can be divided into three categories: analytical, molecular, and structural.

The empirical formula, which is defined as the ratio of subscripts of the least number of full components in the formula, is the simplest formula for a compound.

Molecular formulas show the quantity of each type of atom in a molecule, while structural formulae indicate the bonds that hold the atoms in a molecule. Empirical equations give the simplest whole-number ratio of the atoms in acompound.

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This reaction involves the displacement of H from H₂PO₄ by Cr. It is an example of a redox reaction, where oxidation and reduction occur simultaneously.

The single replacement reaction between Cr and H₂PO₄ can be represented as follows:

Cr + H₂PO₄ → CrPO₄ + H₂

In this reaction, Cr is oxidized from its elemental form to Cr³+ ion, while H₂PO₄ is reduced to H₂ gas and PO₄³⁻ ions combine with Cr³+ to form CrPO₄.

To balance the reaction, we need to make sure that the number of atoms of each element is equal on both sides of the reaction. In this case, there is one Cr atom and one H₂PO₄ molecule on the left side, and one CrPO₄ molecule and one H₂ molecule on the right side. Therefore, the balanced equation is:

Cr + H₂PO₄ → CrPO₄ + H₂

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Answer:

huaD?W

Explanation:

The temperature of 1.585 K is required for 5 moles of Helium at a pressure of 760 torrs and volume of 650 mL.

The Ideal Gas Equation is the equation for hypothetical gases expressed mathematically by combining empirical and physical constants and is also known as the general gas equation.

The ideal gas equation can be represented for gas as:

PV = nRT

Where P is the pressure, V is the volume, n is the amount of ideal gas  (in moles), R is the gas constant and T is the temperature (in Kelvin) of the ideal gas.

Given, the pressure of helium gas, P = 760 torr = 1 atm

The volume of helium gas = 650 ml = 0.65 L

The number of moles of helium gas, n = 5

The value of the gas constant, R = 0.082 L atm /K mol

Substitute the values in the ideal gas equation:

(1atm) × (0.65 L) = (5 mol) ×(0.0832 L atm /K mol) × T

T = 1.585 K

Therefore, the temperature of the helium gas at a given presurre and volume is equal to 1.585 K.

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We know the standard reduction potentials of the half-cells involved, so we can find the cell voltage and the spontaneous reaction. Thus;

The anode reaction is:

Pb(s) → Pb2+(aq) + 2e-

This is the oxidation half-reaction that occurs in the Pb half-cell.

The cathode reaction is:F2(g) + 2e- → 2F-(aq).

This is the reduction half-reaction that occurs in the F2 half-cell.

The spontaneous cell reaction is

:Pb(s) + F2(g) → Pb2+(aq) + 2F-(aq).

This is the combination of the oxidation and reduction half-reactions, with the electrons canceled out from both sides.

The cell voltage is 2.996 V The standard cell potential is calculated as follows:

standard cell potential = E°(reduction) - E°(oxidation)standard cell potential = 2.870 V - (-0.126 V)standard cell potential = 2.996 V, The cell voltage is positive, indicating that the reaction is spontaneous.

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Answer:

a) how many mg of n/ kg of soil is mineralized every year? Nitrogen mineralized every year = 60 mg N/kg of soil

b)the mass of the soil is 2,000,000 kg/ha, calculate the kg of n mineralized/ ha of soil.

120 kg/ha of nitrogen is mineralized every year.

Explanation:

To calculate the amount of nitrogen mineralized every year, we can use the formula:

Nitrogen mineralized every year = Nitrogen in organic forms x Mineralization rate

From the problem statement, we know that the soil contains 2000 mg N/kg of soil in organic forms and the rate of mineralization is 3% per year.

Substituting these values into the formula above, we get:

Nitrogen mineralized every year = 2000 mg N/kg of soil x 3%

Nitrogen mineralized every year = 60 mg N/kg of soil

To calculate the kg of N mineralized/ha of soil, we can use the formula:

kg of N mineralized/ha of soil = (Nitrogen mineralized every year x Mass of soil)/1000

From the problem statement, we know that the mass of the soil is 2 000 000 kg/ha.

Substituting these values into the formula above, we get:

kg of N mineralized/ha of soil = (60 mg N/kg of soil x 2 000 000 kg/ha)/1000

kg of N mineralized/ha of soil = 120 kg/ha

Therefore, 120 kg/ha of nitrogen is mineralized every year.

The approximate pH at the equivalence point of a weak acid-strong base titration if 25 ml of aqueous hydrofluoric acid requires 30.00 ml of 0.400 m NaOH is 0.66.

We must first figure out how many moles of NaOH were supplied to achieve the equivalence point in a weak acid-strong base titration before we can determine the pH there.

Molarity times volume is 0.400 mol/L times 0.03000 L, or 0.0120 mol of NaOH.

NaOH and HF have a 1:1 stoichiometric ratio, therefore 0.0120 mol of HF is also how many moles were in the initial solution.

We can now calculate HF's Ka using the equilibrium formula for HF:

Ka = [HF][H+][F-]

All of the HF's reactions with the NaOH at the equivalence point have produced water and NaF.

The pH at the equivalency point is as a result:

pH is almost equal to -log[H+] = -log (0.220) = 0.66 (to two significant figures).

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Answer:

Examine the units: If the density is 1 g/mL, how many mL do you need to make 250 g?

X mL * 1 g/mL = 250 g

Solve for X

x mL = 250 g / 1 g/mL = 250 mL

Hope this helps :)

The volume of water = 250 L

\(density = \frac{mass}{volume}\)

Given, density = 1.0 g/L = 0.001 kg/L

           mass = 250 g = 0.25 kg

Putting the values in the equation

\(0.001 = \frac{0.25}{volume}\)

\(volume = \frac{0.25}{0.001}\)

\(volume = 250 L\)

Hence, the volume of the water is 250 L.

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the x is small approximation is used when the equilibrium constant is relatively large and the initial concentration is relatively small. The assumption is that x is small compared to the equilibrium concentrations. If x is a small fraction of the equilibrium concentrations, the assumption is valid.

Equilibrium is a state of balance in a system. It occurs when two opposing forces counteract each other, cancelling out any change. In a chemical equilibrium, the rates of the forward and reverse reactions are equal and the concentrations of the reactants and products remain unchanged. In a physical equilibrium, the forces acting in opposite directions are balanced and the system is at rest.

The factors affecting equilibrium concentration are:

1. Initial Concentration: The concentrations of reactants and products at the start of the reaction will affect the concentrations of the species present at equilibrium.

2. Temperature: An increase in temperature generally favours the side of the reaction with the fewer number of moles, known as ‘Le Chatelier’s Principle’.

3. Pressure: Increasing the pressure at a constant temperature will result in the reaction shifting to the side with the fewer number of moles, following Le Chatelier’s Principle.

4. Catalyst: The presence of a catalyst can effectively reduce the reaction activation energy and thus helps in speeding up the reaction rate and eventually leads to the form of the equilibrium with different concentrations from the uncatalyzed reaction.

5. Surface area (catalyzed reactions only): Increasing the surface area increases the number of collisions per unit time and thus increases the overall reaction rate. This in turn affects the concentrations of the equilibrium species.

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Let's see

\(\\ \rm\Rrightarrow C_{12}H_{22}O_{11}\)

\(\\ \rm\Rrightarrow 12(12)+22(1)+11(16)\)

\(\\ \rm\Rrightarrow 144+22+176\)

\(\\ \rm\Rrightarrow 166+176\)

\(\\ \rm\Rrightarrow 342g/mol\)

Answer:

D or 4

Explanation:

right on edge 2021

Answer:

d

Explanation:

Answer:

gain electrons

Explanation:

"atoms gain electrons, they acquire a negative charge "

Answer:

Acetic acid, systematically named ethanoic acid, is an acidic, colourless liquid and organic compound with the chemical formula CH₃COOH. Diluted, glacial acetic acid is used in preservation and canning of pickles and other vegetables. It is also used as a descaling agent for cleaning.

Explanation:

Joe Viskocil is not a fan of big explosions because it is is either lopsided or squashed and not spherical.

This is defined as a sudden, violent burst of energy which is associated with a rapid expansion of volume.

Joe Viskocil doesn't like big explosions because it is is either lopsided or squashed. and capable of creating more damage.

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Answer:

In the Celsius scale each degree is one part of 100 degrees. This is because in this scale the difference between boiling and freezing temperatures of water is 100 ° - 0 ° = 100 °, so one degree Celsius is one part of 100.

In the Farhenheit scale, each degree is one part of 180 degrees. This is because in this scale the difference between the boiling and freezing temperatures are 212 ° - 32 ° = 180°, so one degree Fahrenheti is one part of 180.

That means that 1 °C is a larger amount than 1 °C, so 20°C is a larger amount than 20°F.

Conclusion: 20 degree change represents a larger change in Celsius scale.

Explanation:

In the Celsius scale each degree is one part of 100 degrees. This is because in this scale the difference between boiling and freezing temperatures of water is 100 ° - 0 ° = 100 °, so one degree Celsius is one part of 100.

In the Farhenheit scale, each degree is one part of 180 degrees. This is because in this scale the difference between the boiling and freezing temperatures are 212 ° - 32 ° = 180°, so one degree Fahrenheti is one part of 180.

That means that 1 °C is a larger amount than 1 °C, so 20°C is a larger amount than 20°F.

Conclusion: 20 degree change represents a larger change in Celsius scale.

The pH of an aqueous solution of 6.99×10⁻³ M hydrobromic acid is approximately 2.15.

The pH of an aqueous solution of 6.99×10-3 M hydrobromic acid is approximately 2.16. This is because hydrobromic acid is a strong acid, meaning that it dissociates completely in water to form H+ ions and Br- ions. The concentration of H+ ions in the solution can be calculated using the formula pH = -log[H+]. Therefore, pH = -log(6.99×10-3) = 2.16.
To determine the pH of an aqueous solution of 6.99×10⁻³ M hydrobromic acid, follow these steps:

1. Identify the formula: Hydrobromic acid (HBr) is a strong acid, meaning it ionizes completely in water, producing H⁺ and Br⁻ ions.

2. Calculate the concentration of H⁺ ions: Since HBr ionizes completely, the concentration of H⁺ ions is equal to the concentration of HBr, which is 6.99×10⁻³ M.

3. Use the pH formula: The pH of a solution is calculated using the formula pH = -log[H⁺], where [H⁺] is the concentration of H⁺ ions in the solution.

4. Calculate the pH: Plug in the concentration of H⁺ ions into the formula:
pH = -log(6.99×10⁻³)

5. Solve for pH: Using a calculator, you will find that the pH is approximately 2.15.

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To find the number of moles of NaOH present in 30.0 mL of 0.140 M NaOH, we can use the formula:

moles of solute = concentration x volume

where "solute" refers to the substance of interest (in this case, NaOH), "concentration" is the molarity of the solution, and "volume" is the volume of the solution in liters.

First, we need to convert the volume of the solution from milliliters to liters:

30.0 mL = 30.0/1000 = 0.030 L

Next, we can substitute the given values into the formula:

moles of NaOH = 0.140 mol/L x 0.030 L = 0.0042 moles

Therefore, there are 0.0042 moles of NaOH present in 30.0 mL of 0.140 M NaOH.

The total pressure in the atm of the gases in the tank at the 450 k after the reaction is complete is 2 atm.

The chemical equation is as :

H₂ + 0.5 O₂  ---->  H₂O

The 1 mole of the H₂  = 0.5 mole of the O₂  

2 mole of the H₂ = 0.5 × 2 mole of the O₂  

Mole of the O₂   = 1 mol

The ideal gas equation is as :

P₁ / n₁ = P₂ / n₂

P₂ = P₁ n₂ / n₁

Where,

The pressure, P₁ = 8 atm

The moles  n₂ = 1 mol

The moles, n₁ = 4 mol

The pressure, P₂  = ?

P₂ = ( 8 × 1 ) / 4

P₂ = 2 atm

The  pressure in of the gases in the tank at the temperature 450 k after the reaction is complete is the 2 atm.

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The positively charged center in an atom is called as Nucleus. It is made up of positively charged protons and neutral sub-atomic particle called as neutrons.

What is meant by protons ?

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Answer:

Double replacement reaction

Explanation:

This is what is known as a double replacement reaction. The two parts of each molecule separate and recombine to form two new compounds. For instance, \(Al_2(SiO_3)_3\) separates into \(Al_2\) and \((SiO_3)_3\), while \(NaOH\) separates into \(Na\) and \(OH\), and then they recombine with the other compound.

Hope this helps!

Answer:

double replacment reaction

Explanation:

srry if it is wrong

Water combines with carbon dioxide to produce slightly acidic groundwater

that dissolves limestone and forms caves.

This is because the reaction between water and carbondioxide to form

bicarbonate ions( HCO₃⁻). The bicarbonate ions dissociate into Hydrogen

atoms thereby increasing the acidity.

The acidic environment results in the formation of acidic groundwater that

dissolves limestone and forms caves.

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2.62 moles of glucose can react with 15.7 moles of oxygen. The balanced chemical equation for the combustion of glucose is:

C6H12O6 + 6O2 → 6CO2 + 6H2O

From the equation, we can see that for every mole of glucose that reacts, 6 moles of oxygen are required. Therefore, the number of moles of glucose that can react with 15.7 moles of oxygen can be calculated as follows:

Number of moles of glucose = (Number of moles of oxygen) / 6

Number of moles of glucose = 15.7 / 6

Number of moles of glucose = 2.62

Therefore, 2.62 moles of glucose can react with 15.7 moles of oxygen.

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Answer:

b

Explanation:

Answer:

it is B hope I helped

=

Explanation:

The magnitude of the force acting on the body is 4000 Newtons.

To find the magnitude of the force, we can use Newton's second law of motion, which states that the force applied to an object is equal to the product of its mass and acceleration.

The given information includes the mass of the body (80 kg) and the resulting velocity (10 m/s). However, since the time duration (0.2 seconds) is also provided, we can use it to calculate the acceleration of the body.

The formula to calculate acceleration is:

Acceleration = Change in Velocity / Time

The change in velocity can be calculated by subtracting the initial velocity (which is 0 m/s as the body is at rest) from the final velocity:

Change in Velocity = Final Velocity - Initial Velocity

Change in Velocity = 10 m/s - 0 m/s

Change in Velocity = 10 m/s

Now, we can calculate the acceleration:

Acceleration = Change in Velocity / Time

Acceleration = 10 m/s / 0.2 s

Acceleration = 50 m/s²

Finally, we can calculate the magnitude of the force using Newton's second law:

Force = Mass x Acceleration

Force = 80 kg x 50 m/s²

Force = 4000 N

Therefore, the magnitude of the force acting on the body is 4000 Newtons.

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Answer:

leachate

Explanation:

Bioleaching. Certain bacteria can break down ores to produce an acidic solution containing copper(II) ions. The solution is called a leachate and the process is called bioleaching . Bioleaching does not need high temperatures, but it produces toxic substances, including sulfuric acid, which damage the environment.

Hope this helps:)

Vapor unlikely to behave as an ideal gas near the temperature at which the vapor would liquify the intermolecular forces between the gas molecules become more significant as the temperature decreases.

An ideal gas can be envisioned as a hypothetical gas consisting of a collection of randomly-dispersed, non-interacting particles with negligible volume.

The notion of an ideal gas proves valuable as it adheres to the principles of the ideal gas law, which is a simplified equation of state.

Furthermore, the behavior of an ideal gas lends itself to analysis through the lens of statistical mechanics.

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To transfer -34.2 kJ of heat according to the balanced chemical reaction 2 KCIO3(s) → 2 KCI(s) + 3 O2(g) with AH = -89.4 kJ, approximately 0.382 moles of KCIO3 solid must be reacted.

To determine the number of moles of KCIO3 solid required to transfer -34.2 kJ of heat, we can use the given balanced chemical reaction and the enthalpy change (ΔH) of the reaction.

Given:

Balanced chemical reaction: 2 KCIO3(s) → 2 KCI(s) + 3 O2(g)

Enthalpy change (ΔH): -89.4 kJ

We can use the following steps to find the number of moles of KCIO3 solid:

1. Write the balanced chemical equation and note the stoichiometric coefficients:

  2 KCIO3(s) → 2 KCI(s) + 3 O2(g)

2. Determine the molar enthalpy change (ΔH) by dividing the enthalpy change by the stoichiometric coefficient of KCIO3:

  ΔH per mole of KCIO3 = -89.4 kJ / 2

3. Calculate the number of moles of KCIO3 required by dividing the desired heat transfer by the molar enthalpy change:

  moles of KCIO3 = -34.2 kJ / ΔH per mole of KCIO3

  Plugging in the values:

  moles of KCIO3 = -34.2 kJ / (-89.4 kJ / 2)

After performing the calculations, we find that approximately 0.382 moles of KCIO3 solid must be reacted to transfer -34.2 kJ of heat according to the balanced chemical reaction 2 KCIO3(s) → 2 KCI(s) + 3 O2(g) with ΔH = -89.4 kJ.

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The product nucleus is Zr-95.

When Y-95 undergoes beta decay, a neutron in the nucleus is converted into a proton, with the emission of an electron (beta particle) and an antineutrino. The resulting nucleus has one more proton and one less neutron than the original nucleus. So, the product nucleus can be represented as Z+1-A, where Z is the atomic number (number of protons) and A is the mass number. In this case, Y-95 has 39 protons and 56 neutrons (95 = 39 + 56). When it undergoes beta decay, a neutron is converted into a proton, resulting in a new nucleus with 40 protons and 55 neutrons.

The product nucleus can be represented as Z+1-A = 40-55, which is Zr-95.

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Answer: mixture

Explanation: Answer my own question on my page please.

Answer: A mixture.

Explanation: A substance has to do with the chemical composition changing, so if you just dissolve sugar into water nothing changes in either’s chemical composition.