Mole questions Chemistry Copper is a product of the reaction that occurs when dry ammonia is passed over a sample of heated copper (II) oxide. The equation for the reaction is given below: 1. 2NH3 + 3CuO → 3Cu + 3H₂O + N₂. Calculate the mass of copper produced if 0.12 dm³ of nitrogen is produced a room temperature and pressure rtp), [Relative atomic mass of Cu = 64; One mole of gas occupies 24dm³ at rtp.] (4 marks)​

Answer:

To solve this problem, we can use the formula:

q = -Ccalorimeter x ΔT

where q is the heat absorbed by the calorimeter, Ccalorimeter is the heat capacity of the calorimeter, and ΔT is the change in temperature of the calorimeter.

First, we need to calculate the amount of heat released by the combustion of diborane. We can use the molar mass of diborane to convert the given mass to moles:

moles of diborane = 0.491 g / 27.66 g/mol = 0.01775 mol

The heat released by the combustion of 1 mole of diborane is -1958 kJ, so the heat released by the combustion of 0.01775 mol is:

q = 0.01775 mol x (-1958 kJ/mol) = -34.76 kJ

The negative sign indicates that heat is released by the reaction.

Now we can use the formula above to find the change in temperature of the calorimeter:

-34.76 kJ = -7.854 kJ/°C x ΔT

ΔT = 4.43°C

Therefore, the final temperature of the calorimeter is 19.63°C - 4.43°C = 15.20°C.

The concentration of the solution in molarity, given that 6.802×10²⁰ particles were dissolved in 0.38 L of water is 3.0×10⁻³ M (option B)

First, we shall determine the number of mole that contains 6.802×10²⁰ particles of Mn(NO₃)₃. Details below:

From Avogadro's hypothesis,

6.022×10²³ particles = 1 mole of Mn(NO₃)₃

Therefore, we can say that

6.802×10²⁰ particles = 6.802×10²⁰ / 6.022×10²³

6.802×10²⁰ particles = 0.001 mole of Mn(NO₃)₃

Finally, we shall obtain the molarity of the solution. Details below:

Molarity of solution = mole / volume

Molarity of solution = 0.001 / 0.38

Molarity of solution = 3.0×10⁻³ M (option B)

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We need 0.798 g of copper (ll) sulfate and 0.400 g of sodium hydroxide to make a 50.0 mL of a 0.100 M solution of each reactant.

To determine the amount of solute needed to make a 50.0 mL of a 0.100 M solution of each reactant when using copper (ll) sulfate and sodium hydroxide, we need to use the formula:

Molarity (M) = moles of solute ÷ volume of solution (in liters)

First, we need to calculate the number of moles of solute needed. Since the molar ratio of copper (ll) sulfate to sodium hydroxide is 1:2, we will need twice as many moles of sodium hydroxide as copper (ll) sulfate.

Let's start with copper (ll) sulfate:

Molarity (CuSO4) = 0.100 M

Volume (V) = 50.0 mL = 0.0500 L

Using the formula, we can rearrange it to solve for moles of solute:

moles of CuSO4 = Molarity × Volume

moles of CuSO4 = 0.100 M × 0.0500 L

moles of CuSO4 = 0.00500 mol

Next, we can calculate the number of moles of sodium hydroxide needed:

moles of NaOH = 2 × moles of CuSO4

moles of NaOH = 2 × 0.00500 mol

moles of NaOH = 0.0100 mol

Now that we know the number of moles of each solute needed, we can calculate the mass of each solute needed using their respective molar masses:

mass of CuSO4 = moles of CuSO4 × molar mass of CuSO4

mass of CuSO4 = 0.00500 mol × 159.61 g/mol

mass of CuSO4 = 0.798 g

mass of NaOH = moles of NaOH × molar mass of NaOH

mass of NaOH = 0.0100 mol × 40.00 g/mol

mass of NaOH = 0.400 g

Therefore, we need 0.798 g of copper (ll) sulfate and 0.400 g of sodium hydroxide to make a 50.0 mL of a 0.100 M solution of each reactant.

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The maximum temperature of the water in the insulated container after the copper metal is added is 40.7 °C.

The problem can be solved using the principle of conservation of energy, which states that the heat lost by the copper metal is equal to the heat gained by the water.

To calculate the heat lost by the copper, the formula

q = m * c * delta T

is used, where q is the heat lost, m is the mass of copper, c is the specific heat of copper, and delta T is the change in temperature of the copper.

Given that the copper is heated from 19.3 °C to 100.0 °C, the heat lost by the copper is calculated to be 450.5 J.

To calculate the heat gained by the water, the same formula is used, where m is the mass of water, c is the specific heat of water, and delta T is the change in temperature of the water.

We are given that the initial temperature of the water is 19.3 °C and the mass of water is 47.5 g. Assuming the final temperature of the water to be T °C, the expression for the heat gained is

47.5 g * 4.184 J/(g·°C) * (T - 19.3) °C.

Equating the expressions for the heat lost and gained, we get

450.5 J = 47.5 g * 4.184 J/(g·°C) * (T - 19.3) °C.

Simplifying and solving for T, we get

T = 40.7 °C,

which is the final temperature of the water after the copper is added.

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Chemical and physical methods are two approaches used to measure the rate of chemical reactions. Chemical methods involve the use of spectroscopic techniques and analyses of reaction products to measure the speed of a reaction. Physical methods involve using thermodynamics and other physical measurements to determine the speed of a reaction.

Answer:

approx 7.41 sextillion

Explanation:

One mole of any substance contains 6.022 x 10^23 particles (Avogadro's Number). Therefore, 1 mole of water contains 6.022 x 10^23 water molecules.

To find how many moles are represented by 7.43 x 10^18 molecules of water, we can divide 7.43 x 10^18 by Avogadro's Number:

7.43 x 10^18 / 6.022 x 10^23 = 0.0123 moles of water

Now, we can use this to find the number of water molecules:

0.0123 moles x 6.022 x 10^23 molecules/mole = 7.41 x 10^21 molecules of water

Therefore, 7.43 x 10^18 molecules of water represent 7.41 x 10^21 molecules or approximately 7.41 sextillion (7,410,000,000,000,000,000) molecules of water.

Answer:

12 degrees

Explanation:

Sodium carbonate, also known as washing soda or soda ash, has a wide range of applications. Sodium carbonate can be naturally occurring or synthetically produced through various methods, including the Solvay process, which is the most common method of industrial production.

Sodium carbonate, also known as washing soda or soda ash, has many uses, including:

1) Cleaning agent: Sodium carbonate is an effective cleaning agent due to its alkaline nature. It is used in laundry detergents and household cleaners to remove stains and grease from clothes and surfaces.

2) Industrial applications: Sodium carbonate is used in a variety of industrial applications. It is used in the production of glass, pulp and paper, and soaps and detergents. It is also used as a water softener and pH regulator in chemical processes.

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The concept molarity is an important method which is used to calculate the concentration of a solution. It is mainly employed to find out the concentration of a binary solution. Here the molarity is 0.67 M. The correct option is D.

The molarity of a solution is defined as the number of moles of the solute dissolved per liter of the solution. It is represented by the letter 'M' and it is expressed in the unit mol / L.

Molarity = Number of moles of solute  / Volume of solution in liters

M = 0.500 / 0.75 = 0.66 mol / L ≈ 0.67 M

Thus the correct option is D.

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1 mole of iron reacts with 2 moles of hydrochloric acid to produce 1 mole of hydrogen gas; therefore, the amount of H₂ produced depends on the amount of iron reacted and the stoichiometry of the reaction.

According to the balanced chemical equation, 1 mole of iron reacts with 2 moles of hydrochloric acid to produce 1 mole of hydrogen gas. Therefore, the amount of hydrogen gas produced by the complete reaction of an iron bar will depend on the amount of iron reacted.

To determine the amount of hydrogen gas produced, we need to know the amount of iron reacted. This can be calculated from the mass of the iron bar using its molar mass. Once we know the amount of iron reacted, we can use the stoichiometry of the reaction to determine the amount of hydrogen gas produced.

For example, if we assume that the iron bar has a mass of 1.0 g, we can calculate the number of moles of iron using its molar mass of 55.85 g/mol:

1.0 g Fe x (1 mol Fe/55.85 g Fe)

= 0.0179 mol Fe

Since the stoichiometry of the reaction is 1:2 (1 mole of iron reacts with 2 moles of hydrochloric acid), we can calculate the amount of hydrogen gas produced by multiplying the number of moles of iron by 2:

0.0179 mol Fe x (1 mol H₂/1 mol Fe) x (22.4 L H2/mol H₂)

= 0.802 L H₂

Therefore, the complete reaction of the iron bar with hydrochloric acid would produce 0.802 L of hydrogen gas, assuming that the iron bar has a mass of 1.0 g.

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It is essential to consult a healthcare professional before taking any medication when experiencing indigestion or any other health condition, to ensure that the medication is safe and effective for the patient's specific needs.

It is not advisable to use drug S when a patient has indigestion problem because drug S may worsen the patient's condition or interact negatively with other medications they are taking. Indigestion is a common condition that occurs when there is an imbalance in the digestive system, causing discomfort, bloating, and nausea. Some drugs can exacerbate these symptoms by increasing the production of stomach acid or by irritating the lining of the digestive tract. Drug S may have side effects that include gastrointestinal disturbances, including stomach pain, nausea, and diarrhea. This can make indigestion symptoms worse and lead to further discomfort and distress for the patient. Additionally, drug S may interact negatively with other medications that the patient is taking, further worsening their indigestion. Therefore, it is essential to consult a healthcare professional before taking any medication when experiencing indigestion or any other health condition, to ensure that the medication is safe and effective for the patient's specific needs.

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To solve this problem, we can use Charles' Law, which states that, at constant volume, the pressure and temperature of a gas are directly proportional.

The formula we will use is:

[tex]\boxed{\large\displaystyle\text{$\begin{gathered}\sf \bf{\dfrac{P_1}{T_1 }=\frac{P_2}{T_2} } \end{gathered}$} }[/tex]

Where:

Solving the formula for V₂:

[tex]\boxed{\large\displaystyle\text{$\begin{gathered}\sf \bf{P_2=\frac{P_1T_2}{ T_1} } \end{gathered}$} }[/tex]

Where:

We substitute the known values:

[tex]\boxed{\large\displaystyle\text{$\begin{gathered}\sf \bf{P_2=\frac{2.50 \ atm\times150.0\not{K} }{315.0\not{k} } } \end{gathered}$} }[/tex]

[tex]\boxed{\boxed{\large\displaystyle\text{$\begin{gathered}\sf \bf{P_2\approx1.19 \ atm } \end{gathered}$} }}[/tex]

The pressure inside the container is approximately 5.43 atmospheres.

The Ideal gas law or general gas equation is expressed as;

PV = nRT

Where P is pressure, V is volume, n is the amount of substance, T is temperature and R is the ideal gas constant ( 0.08206 Latm/molK )

Given that:

Amount of gas n = 43 moles

Volume V = 260 Liters

Temperature K = 400 K

Pressure P = ?

To determine the pressure of the gas, plug the given values into the above formula and solve for pressure.

PV = nRT

P = nRT / V

P = ( 43 × 0.08206 × 400 ) / 260

P = 1411.432/260

P = 5.43 atm

Therefore, the pressure of the gas is 5.43 atm.

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A metastable system is a physical or chemical system that is in a stable equilibrium state but has the potential to move to a more stable state with lower energy if it is subjected to an external perturbation or trigger.

In a metastable system, the energy of the system is high enough to keep it in a stable state but is not high enough to allow it to reach the lowest possible energy state or equilibrium.

This makes the system unstable, as it can be triggered to transition to a more stable state with a lower energy level. However, the system may remain in the metastable state for a long time if the external conditions or triggers are not present to initiate the transition to the lower energy state.

Thus, metastable systems are important in various fields, including physics, chemistry, materials science, and biology, and understanding their behavior is crucial in designing and predicting the properties of materials and systems.

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The accepted value for the molar volume of an ideal gas at STP is 22.4 L/mol.

To calculate the molar volume of hydrogen gas at STP, we can use the ideal gas law equation, 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 in Kelvin.

From the given information, we have:

Pressure (P) = 103.40 kPa

Volume (V) = V2 from calculation 2 above (in liters)

Moles (n) = moles from calculation 1 above

Temperature (T) = 25.8 °C + 273.15 = 298.95 K (mean temperature)

Molar volume = V / n

Molar volume = V2 / moles

The accepted value for the molar volume of an ideal gas at STP is 22.4 L/mol. To calculate the percent error, we can use the formula:

Percent error = (|experimental value - accepted value| / accepted value) * 100

Percent error = (|molar volume - 22.4 L/mol| / 22.4 L/mol) * 100

Possible sources of error in this experiment may include experimental inaccuracies such as: Inaccurate pressure measurements due to instrumental limitations or calibration issues. Temperature fluctuations during the experiment, leading to variations in the calculated values. Assumptions of ideal gas behavior may not hold completely. Systematic errors in the equipment used, such as leaks or variations in volume measurements. It's important to note that this is a hypothetical experiment based on the given information, and the actual sources of error may vary depending on the experimental setup and procedure.

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After considering all the given options we come to the conclusion that the set of products that are accurate for double replacement reaction is 2KNO₃ (aq) + PbI₂ (s), which is Option D under the condition that the given reaction is 2KI(aq) + Pb(NO₃)₂(aq).

A double replacement reaction generally comprised of reactions in regarding the positive and negative ions of two ionic compounds exchanges locations to form two new compounds. The general form for this type  reaction is: AB + CD → AD + CB .
For instance, when silver nitrate (AgNO₃) is added  with sodium chloride (NaCl), the following reaction takes place AgNO₃ + NaCl → AgCl + NaNO₃ ²

The correct set of products for the double replacement reaction 2KI(aq) + Pb(NO₃)₂(aq) is 2KNO₃ (aq) + PbI₂ (s).
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Answer:

a.25.50

Explanation:

The order of a reaction is determined experimentally and describes the relationship between the rate of a reaction and the concentration of reactants, whereas the molecularity of a reaction is a theoretical concept that describes the number of molecules that participate in the rate-determining step of a reaction.

The order of a reaction is the mathematical representation of the relationship between the rate of a reaction and the concentration of reactants. It describes how the rate of a reaction changes with respect to the change in concentration of reactants.

The order of a reaction is determined experimentally by observing how the rate of a reaction changes as the concentration of reactants is varied while keeping the concentration of other reactants and conditions constant. The order of a reaction can be 0, 1, 2, or even a fraction.

The molecularity of a reaction ​is the number of reactant molecules that collide in a single step to form the product. The molecularity of a reaction can be unimolecular (1), bimolecular (2), or termolecular (3). It is important to note that not all reactions have a molecularity, as some reactions have multiple steps and multiple reactants involved.

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The expressions that would cause a DECREASE in energy  are

A. DECREASING both wave frequency and wavelength

B. DECREASING the wave frequency and INCREASING thewavelength

The number of complete wavelengths  that can be found in the unit of time  can be regarded as thefrequency (f) , however when the wavelength increases in size, then the frequency as well as the energy (E) decrease. .

It should be noted that the the frequency increases, the wavelength gets shorter, hence as the frequency decreases, there there would be increase in wavelength .

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comlete question;

Which of these would cause a DECREASE in

energy?

A. DECREASING both wave frequency and wavelength

B. DECREASING the wave frequency and INCREASING the

wavelength

C. INCREASING both wave frequency and wavelength

D. INCREASING the wave frequency and DECREASING the

wavelength

INCREASING the wave frequency DECREASING the wavelength

Answer:

Related questions

What assumption is made during the relative dating of fossils?

the rule of superposition

In relative dating, to determine the relative age, geologists believe that, in a sequence of superficial layers, the newer layers fall on top of older ones unless any physical disturbance such as soil erosion happens. Scientists call this the rule of superposition, and it is the central assumption in relative dating

The chemical compound with highest boiling point is  NaI

Due to ionic bonding between the elements there is a stronger bond that is seen than other compounds. Hence, maximum boiling point.

Answer:

285.35 liters.

Explanation:

To calculate the new volume of the air sample, we can use the formula:

Volume = Mass / Density

Given:

Mass of the air sample = 5.65 × 10^2 g

Initial density of the air sample = 1.24 g/L

Final density of the air sample = 1.98 g/L

Using the formula, we can calculate the initial volume and then use the final density to find the new volume.

Initial Volume = Mass / Initial Density

Initial Volume = 5.65 × 10^2 g / 1.24 g/L

Initial Volume = 456.45 L

New Volume = Mass / Final Density

New Volume = 5.65 × 10^2 g / 1.98 g/L

New Volume = 285.35 L

Therefore, the new volume of the air sample is approximately 285.35 liters.

A symbol used in a chemical equation is called a chemical formula. A chemical formula is a shorthand notation that represents the type and number of atoms in a molecule or compound.

The elements are represented by their chemical symbols, and the number of atoms of each element is indicated by a subscript written to the right of the symbol. The chemical formula for a reactant or product in a chemical equation provides information about the identity and amount of substances involved in the reaction.

Chemical formulas are typically composed of chemical symbols and numerical subscripts that indicate the number of atoms or molecules of each element or compound present in the reaction.

For example, in the chemical equation [tex]H_2 + O_2[/tex] → [tex]2H_2O[/tex]  , the chemical formulas are [tex]H_2[/tex], [tex]O_2[/tex], and [tex]H_2O[/tex], which represent the molecules of hydrogen gas, oxygen gas, and water, respectively.

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If a dilute solution of hydrochloric acid (HCl) is electrolyzed, the gas produced at the anode (positive electrode) will be chlorine gas (Cl₂). When a dilute solution of hydrochloric acid (HCl) is electrolyzed, it undergoes a process called electrolysis.

In the case of hydrochloric acid, it dissociates into hydrogen ions (H+) and chloride ions (Cl-). The positive hydrogen ions (H+) are attracted to the cathode (negative electrode) and are involved in the reduction reaction. At the cathode, hydrogen gas (H₂) is produced as a result of the reduction of H+ ions. At the anode (positive electrode), the chloride ions (Cl-) are attracted. Here, the chloride ions undergo oxidation, losing electrons and forming chlorine gas (Cl₂). The chlorine gas is released as a product of the reaction at the anode.

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With no electrical energy available, conduction would most likely provide enough thermal energy to heat the hermit’s cabin.

Thermal energy is defined as a type of energy which is contained within a system which is responsible for temperature rise.Heat is a type of thermal energy.It is concerned with the first law of thermodynamics.

Thermal energy arises from friction and drag.It includes the internal energy or enthalpy of a body of matter and radiation.It is related to internal energy and heat .It arises when a substance whose molecules or atoms are vibrating faster.

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Answer:

A mixture of ethane and ethene occupies 40 litre at 1.00 atm and at 400 K.The mixture reacts completely with 130 g of O2 to produce CO2 and H2O . Assuming ...

Missing: 32 ‎Br2

The percent yield is 172.5%. This is greater than 100% due to experimental errors such as incomplete reaction or loss of product during the experiment.

To determine the limiting reactant, we need to find the number of moles of each reactant:

92.4 L of H2 at STP (standard temperature and pressure: 0°C and 1 atm) is 92.4/22.4 = 4.12 moles of H2.

168.0 g of P4 is 168.0/123.9 = 1.36 moles of P4.

Using the balanced chemical equation, we can see that 1 mole of P4 reacts with 6 moles of H2 to produce 4 moles of PH3. Therefore, the maximum amount of PH3 that can be produced from 1.36 moles of P4 is:

1.36 mol P4 × (4 mol PH3/6 mol H2) × (4 mol PH3/1 mol P4) = 1.09 mol PH3

Since this is less than the maximum amount of PH3 that can be produced from 4.12 moles of H2:

4.12 mol H2 × (4 mol PH3/6 mol H2) = 2.75 mol PH3

we can conclude that H2 is the limiting reactant.

To calculate the theoretical yield of PH3, we use the amount of limiting reactant, which is 4.12 moles of H2:

4.12 mol H2 × (4 mol PH3/6 mol H2) × (1 L/22.4 mol) = 0.733 L of PH3 at STP

The actual yield is given as 44.7 L of PH3 at STP, which is converted to moles using the ideal gas law:

PV = nRT

(1 atm) × (44.7 L) = n × (0.08206 L atm mol^-1 K^-1) × (273.15 K)

n = 1.88 moles of PH3

The percent yield is then calculated as:

(actual yield/theoretical yield) × 100% = (1.88 mol/1.09 mol) × 100% = 172.5%

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The model would be complete when there two pairs of white dots and one pair of black dots

The chemical process of electrolysis breaks down water molecules into their component parts, hydrogen  and oxygen , using an electric current. Two simultaneous reactions take place at distinct electrodes, referred to as the anode and cathode, which are submerged in an electrolyte solution, to produce this process.

A crucial step in the process of creating hydrogen gas, a clean and renewable energy source, is the electrolysis of water.

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sign of ∆H :-

We know

when methane burns in presence of oxygen heat is released as a form of energy so the reaction is exothermic.∆H must be -ve

#2