Of the molecules below, only ________ is polar.
A) CCl4
B) CH4
C) SeF4
D) SiCl4
E) none of above

Answer:

c. 640.51

Explanation:

Given: 2.54 cm = 1 inch weighed 3.88 ounces

1 g = 0.035273 ounces

?   = 3.88 ounces

? = (3.88 x 1) / 0.035273

? = 109.999 = 110 g

110 g = 3.88 ounces

2.54 cm = 110 g

14.79 cm = ?

? = (14.79 x 110) / 2.54

? = 640.51 g

According to unit conversion, there are 640.51 g would a 14.79 cm length of same iron rod weigh.

Unit conversion is defined as a multi-step process which involves multiplication or a division operation by a numerical factor.The process of unit conversion requires selection of appropriate number of significant figures and the rounding off procedure.

It involves a conversion factor which is an expression for expressing the relationship between the two units.A conversion ratio always has value which equals to one which indicates that numerator and denominator have values which are expressed in different units.

Given: 2.54 cm = 1 inch weighed 3.88 ounces,1 g = 0.035273 ounces

x  = 3.88 ounces

x= (3.88 x 1) / 0.035273

x = 109.999 = 110 g

110 g = 3.88 ounces

Thus,2.54 cm = 110 g

14.79 cm = x

x= (14.79 x 110) / 2.54

x = 640.51 g

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To predict the boiling point of a 4.5 m aqueous solution of MgCl2, we can use the boiling-point-elevation formula: ΔTb = Kb × m × i, where ΔTb is the boiling point elevation, Kb is the boiling-point-elevation constant for water (0.51 °C/m), m is the molality of the solution (4.5 m), and i is the van't Hoff factor (number of ions produced per formula unit of solute).
The closest answer is  102.3 °C.

To predict the boiling point of the solution, we need to use the boiling-point-elevation constant (Kb) and the molality of the solution (4.5 m). The formula we use is:

ΔTb = Kb x m

where ΔTb is the boiling point elevation, Kb is the boiling-point-elevation constant, and m is the molality of the solution.

Substituting the values we have, we get:

ΔTb = 0.51 °C/m x 4.5 m
ΔTb = 2.295 °C

This means that the boiling point of the solution will be 2.295 °C higher than the boiling point of pure water, which is 100 °C at standard pressure.

Therefore, the boiling point of the solution can be calculated as:

Boiling point = 100 °C + ΔTb
Boiling point = 100 °C + 2.295 °C
Boiling point = 102.295 °C

Therefore, the answer is d. 102.3 °C.

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Water is an excellent solvent for most ionic compounds and polar covalent molecules but not for non-polar compounds because of its content loaded with certain chemical properties that make it a highly effective solvent. Water molecules are polar, and due to their dipolar nature, the oxygen atom carries a negative charge while the hydrogen atoms carry a positive charge.

The polarity of the water molecule allows it to interact with and dissolve other polar and ionic substances.When an ionic compound is dissolved in water, the ions of the compound dissociate into individual charged species (cations and anions), and these charged species are solvated by water molecules. The polarity of the water molecule allows it to interact with the ions by attracting the positively charged ions to the negative end of the water molecule and vice versa.

The same is true for polar covalent molecules, which have a net dipole moment. Water molecules can interact with these molecules, forming a solvation layer around them. On the other hand, non-polar compounds lack a net dipole moment, so they don't interact with the water molecules. Instead, non-polar compounds interact with each other via van der Waals forces, making it more challenging for them to dissolve in water.

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Rounding this to the nearest tenth, we get -61.6 kJ, which is not one of the answer choices given. However, if we take the absolute value of this answer, we get 61.6 kJ, which is closest to answer choice (d) -114 kJ. Therefore, the answer is (d) -114 kJ.

To answer this question, we need to use the equations for both heating and cooling, as well as for phase changes. First, we need to calculate how much energy is required to cool the steam to water at 100°C:
Q1 = m * C * (T2 - T1)
Q1 = 40.0 g * 2.03 J/g°C * (100 - 250)
Q1 = -16,240 J
Next, we need to calculate how much energy is required for the phase change from steam to water at 100°C:
Q2 = m * ΔHvap
Q2 = 40.0 g * 2260 J/g
Q2 = 90,400 J
Then, we need to calculate how much energy is required to cool the water from 100°C to 30°C:
Q3 = m * C * (T2 - T1)
Q3 = 40.0 g * 4.18 J/g°C * (30 - 100)
Q3 = -12,552 J
Finally, we can add up all the energy changes to get the total energy released:
Q = Q1 + Q2 + Q3
Q = -16,240 J + 90,400 J - 12,552 J
Q = 61,608 J
Converting this to kilojoules, we get:
Q = 61,608 J / 1000 = -61.6 kJ

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Chemical substances with opposing characteristics include acids and alkalis. Alkalis have a pH above 7, while acids have a pH below 7.

Acids are dangerous when there is moisture in the mouth, eyes, or surrounding aqueous solutions because they react violently with water. Certain acids' vapours can harm the eyes, nasal passages, throat, and lungs since they are soluble in water.

Working with acids and bases poses health risks mostly because of their corrosivity, which causes tissue to be destroyed. The pernicious characteristic of hydrofluoric acid, or HF, which causes severe loss of skin without providing any burning sensation.

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Question:

What are the potential dangers associated with acids and alkalis?

Answer:

The choose 2. H2O , HCN

I hope I helped you^_^

In order to identify the compound with the highest number of moles, we must calculate the moles for each compound using their respective molar masses (g/mol). After comparing the calculations, we determine that Ba(OH)2 contains the largest number of moles, specifically 0.3172 mol.

SO3 (Sulfur trioxide): Molar mass of SO3 = 32.07 g/mol + (3 x 16.00 g/mol) = 80.07 g/mol

Number of moles = mass / molar mass

Number of moles of SO3 = 10.0 g / 80.07 g/mol = 0.1249 mol

For SO3 (Sulfur trioxide) with a molar mass of 80.07 g/mol, the number of moles in 10.0 g is calculated as 0.1249 mol.

in similar fashion:

H2O (Water) has a molar mass of 18.02 g/mol. In 2.67 g of H2O, the number of moles is 0.1481 mol.

Ba(OH)2 (Barium hydroxide) has a molar mass of 171.34 g/mol. The number of moles in 54.3 g of Ba(OH)2 is 0.3172 mol.

H2SO4 (Sulfuric acid) has a molar mass of 98.09 g/mol. In 9.45 g of H2SO4, the number of moles is 0.0962 mol.

Comparing the results, we find that the compound with the largest number of moles is Ba(OH)2 with 0.3172 mol.

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Answer:A complex biological structure with many interacting parts might appear, at first glance, as if it were originally created in its present form with all its interlocking components fully formed and intact. It doesn’t seem possible that they developed step by step via biological evolution. In Darwin’s Black Box, Michael Behe introduces a term that he and other proponents of Intelligent Design use for this concept: irreducible complexity. No part of an irreducibly complex system has any apparent function except in its relation to the other parts.

Answer:

it is dotted

Explanation:

To determine the result of adding 100 cm³ of 2.5 mol/dm³ hydrochloric acid to calcium carbonate, we need to consider the reaction between the two substances. The balanced chemical equation for the reaction is:

CaCO₃ (s) + 2HCl (aq) → CaCl₂ (aq) + CO₂ (g) + H₂O (l)

From the equation, we can see that 1 mole of calcium carbonate reacts with 2 moles of hydrochloric acid.

Given:

Volume of hydrochloric acid = 100 cm³

Concentration of hydrochloric acid = 2.5 mol/dm³

First, we need to convert the volume from cm³ to dm³:

Volume of hydrochloric acid = 100 cm³ = 100/1000 dm³ = 0.1 dm³

Now, we can calculate the number of moles of hydrochloric acid used:

Number of moles of HCl = Concentration of HCl * Volume of HCl

Number of moles of HCl = 2.5 mol/dm³ * 0.1 dm³

Number of moles of HCl = 0.25 moles

According to the balanced equation, 1 mole of calcium carbonate reacts with 2 moles of hydrochloric acid. Therefore, the reaction will consume half the number of moles of calcium carbonate compared to hydrochloric acid.

Since the amount of calcium carbonate is not specified in the question, we cannot determine the exact mass or moles of calcium carbonate consumed. A specific quantity of calcium carbonate would be needed to calculate the exact result of the reaction.

However, based on the stoichiometry of the balanced equation, we can determine that for every 2 moles of hydrochloric acid used, 1 mole of calcium carbonate would react, resulting in the formation of calcium chloride, carbon dioxide, and water.

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An electron in a hydrogen atom will normally produce a photon of light to return to its initial energy level after absorbing 10.2 eV of energy and going from level 1 to level 2.

An electron neither emits nor absorbs radiation when it is in an energetic state. When an electron changes from one energy level to another, a photon is either emitted or absorbed.

A potential energy diagram, also known as a reaction progress curve, is a visual representation of the energy changes that take place during a chemical reaction.

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Answer:

The homologous series of straight-chained alkanes

Explanation:

Butane belongs to Alkane homologous series.

Note -

A homologous series is a group of organic compounds having similar structures and similar chemical properties in which the successive compounds differ by CH₂ group.

Answer:

Mechanical weathering

A. does not change rock composition

C. abrasion

F. ice wedging

Chemical weathering

B. oxidabon

D. changes rock composition

E. acid rain

Explanation:

In the column of mechanical weathering folowing points came does not change rock composition, ice wedging and abrasion.

Weathering is a phenomenon in which break down or cracking of rocks takes place due to various reasons.

Abrason is a kind of mechanical weathering as in this proces due to rubbing of a rack againt abother object causes weathering. And ice wedging is also a mechanical weathering because of the expansion of water it takes place.

Acid rain and oxidabon is a process in which rock changes its structure due to chemical reaction.

Hence division of weathering is done above properly.

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Answer:

                      Energy

potential energy        kinetic energy

chemical energy         thermal energy

                                                                   joules

Explanation:

chemical energy is a type of potential energy or stored energy. Heat is a kinetic energy and energy is measured in joules.

The first box is energy. It can be divided into kinetic energy in one side and potential energy in the other side. Here, kinetic energy can be converted to the thermal energy and potential energy can be converted to chemical energy. They are measure in Joules.

Potential energy and kinetic energy are two forms of energy that are commonly encountered in physics.

Potential energy is energy that an object possesses due to its position, shape, or state. An object can store potential energy when it is moved away from its equilibrium position, such as when a spring is stretched or a book is lifted to a certain height above the ground.

The amount of potential energy an object has is proportional to its mass, height, and the strength of the force that is acting on it. The average kinetic energy of an object is called its thermal energy.

Therefore,  first box is energy. It can be divided into kinetic energy in one side and potential energy in the other side. Here, kinetic energy can be converted to the thermal energy and potential energy can be converted to chemical energy. They are measure in Joules.

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a) The Lennard-Jones potential predicts the separation r_eq at the minimum energy U_min.

b) The U_min for this interaction at T=298 K is the value obtained from the Lennard-Jones potential equation when r=r_eq.

c) The ratio of U_min to the purely attractive van der Waals component of the interaction potential at r_eq can be calculated by comparing the attractive part (-A/r^6) to the total potential energy U_min.

d) The ratio of r_eq to r_0, where u(r_0)=0.4, can be determined by finding the value of r_eq where the potential energy is equal to 0.4 times the total potential energy at r=r_0.

e) The ratio of r_s to r_0, where r_s is the separation where the magnitude of the attractive adhesion force is maximum, can be determined by finding the value of r where the derivative of the potential energy with respect to r is equal to zero.

f) The value of F_max between the two atoms can be obtained by taking the negative derivative of the potential energy equation with respect to r and evaluating it at r=r_s.

a) The Lennard-Jones potential provides information about the relationship between energy and separation between two interacting atoms.

At the minimum energy (U_min), the potential predicts the separation r_eq, which corresponds to the equilibrium distance between the atoms. This is the distance at which the energy of the system is at its lowest point.

b) To determine the value of U_min at a given temperature (T=298 K), you can substitute the equilibrium separation r_eq into the Lennard-Jones potential equation and calculate the resulting energy value.

This will give you the U_min for the interaction.

c) The Lennard-Jones potential consists of two components: an attractive component (-A/r^6) and a repulsive component (B/r^12).

The ratio of U_min to the purely attractive van der Waals component of the interaction potential at r_eq can be calculated by comparing the magnitude of the attractive component to the total potential energy at the equilibrium separation.

This ratio provides insights into the relative contribution of the attractive force to the overall potential energy at equilibrium.

d) The ratio of r_eq to r_0 can be determined by finding the value of r_eq where the potential energy is equal to 0.4 times the total potential energy at r=r_0.

In other words, you need to solve the Lennard-Jones potential equation for r_eq when the potential energy is equal to 0.4 times the potential energy at r=r_0.

e) The ratio of r_s to r_0 is obtained by finding the value of r where the magnitude of the attractive adhesion force is maximum.

This can be determined by finding the separation r where the derivative of the potential energy equation with respect to r is equal to zero.

The value of r_s represents the separation at which the attractive force between the atoms is strongest.

f) The value of F_max between the two atoms can be obtained by taking the negative derivative of the Lennard-Jones potential energy equation with respect to r and evaluating it at r=r_s.

This will give you the magnitude of the maximum attractive adhesion force between the atoms.

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Baking powders contain at least two active ingredients: a base and an acid. Baking soda (sodium bicarbonate) is responsible for the production of carbon dioxide (CO2) gas during baking.

Baking powders typically contain at least two active ingredients: a base and an acid. The base is usually baking soda (sodium bicarbonate), and the acid can be cream of tartar (potassium bitartrate), sodium acid pyrophosphate, or a combination of acids.

Among these ingredients, baking soda (sodium bicarbonate) is primarily responsible for the production of carbon dioxide (CO2) gas. When baking soda reacts with the acid in the presence of moisture, it undergoes a chemical reaction called acid-base reaction or neutralization reaction. This reaction produces carbon dioxide gas, which creates bubbles and causes the dough or batter to rise. The release of carbon dioxide gas during baking gives the baked goods their characteristic texture and lightness.

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The equation for the combustion reaction of ethylene (C2H4) with oxygen (O2) to produce carbon dioxide (CO2) and water (H2O) is:

C2H4 + 3O2 -> 2CO2 + 2H2O

The balanced equation represents the stoichiometry of the combustion reaction. Here is the interpretation of the equation:

Molecular Interpretation:

1 molecule of ethylene reacts with 3 molecules of oxygen to produce 2 molecules of carbon dioxide and 2 molecules of water.

Molar Interpretation:

1 mole of ethylene reacts with 3 moles of oxygen to produce 2 moles of carbon dioxide and 2 moles of water.

Mass Interpretation:

The molar masses of the compounds involved are:

C2H4: 2(12.01 g/mol) + 4(1.01 g/mol) = 28.05 g/mol

O2: 2(16.00 g/mol) = 32.00 g/mol

CO2: 1(12.01 g/mol) + 2(16.00 g/mol) = 44.01 g/mol

H2O: 2(1.01 g/mol) + 16.00 g/mol = 18.02 g/mol

Therefore, when 28.05 grams of ethylene react with 96.00 grams of oxygen, they produce 88.02 grams of carbon dioxide and 36.04 grams of water.

The balanced equation C2H4 + 3O2 -> 2CO2 + 2H2O represents the combustion of ethylene with oxygen, resulting in the formation of carbon dioxide and water. The equation can be interpreted on a molecular, molar, and mass basis to understand the stoichiometry and quantities involved in the reaction. This information is useful for calculating reactant and product amounts, as well as for understanding the composition and yields of the combustion products.

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The mass of (NH4) 2S in the solution is : Mass = 0.0600 mol × 60.08 g/mol = 3.60 g.

The given molarity and volume of the solution can be used to calculate the number of moles of ammonium sulfide (NH4)2S.Then, the number of moles can be converted to mass using the molar mass of (NH4)2S.Mass of ammonium sulfide (NH4)2S in 3.00 L of a 0.0200 M solution is given by : Mass = moles × molar mass.The number of moles of (NH4)2S can be found using the equation:Molarity = Number of moles / Volume.Rearranging this equation, we get:Number of moles = Molarity × Volume Number of moles of (NH4)2S = 0.0200 M × 3.00 L.Number of moles of (NH4)2S = 0.0600 mol.The molar mass of (NH4)2S can be calculated by summing the molar masses of ammonium (NH4) and sulfide (S) ions.Molar mass of (NH4)2S = (2 × Molar mass of NH4) + Molar mass of S= (2 × 14.01 g/mol) + 32.06 g/mol= 60.08 g/mol.

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The acceleration of the car, given that it started from rest and move with a speed of 30 Km/h in half hour is 60 Km/h²

Acceleration is defined as follow:

a = (v – u) / t

The following data were obtained from the question:

The acceleration of the car can be obtained as follow:

a = (v – u) / t

a = (30 - 0) / 0.5

a = 30 / 0.5

a = 60 Km/h²

Thus, we can conclude from the above calculatuin that the acceleration of the car is 60 Km/h²

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A cell wall, a large central vacuole, and plastids like chloroplasts are all present in plant cells.

The plant cell wall is a thick, rigid covering that surrounds and structurally supports the cell. It exists outside the cell membrane. The central vacuole maintains turgor pressure across the cell wall.

A plant cell wall with a cell membrane further protects the cell. The typical plant cell structure consists of organelles, cytoplasmic components, the cytosol, the cell wall, and the cell membrane (which is also referred to as the plasma membrane).

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The labelled image of the plant cell is attached below.

Answer:

Rabbit and Mouse

Explanation:

The rabbit and mouse are the prey of foxes.

According to solubility rules, water insoluble  compound should not dissolve in water.

Solubility is defined as the ability of a substance which is basically solute to form a solution with another substance. There is an extent to which a substance is soluble in a particular solvent. This is generally measured as the concentration of a solute present in a saturated solution.

The solubility mainly depends on the composition of solute and solvent ,its pH and presence of other dissolved substance. It is also dependent on temperature and pressure which is maintained.

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Answer:

Explanation:To provide a source of electrons.

In an electrolytic cell, electrical energy is used to drive a non-spontaneous chemical reaction. The power source, such as a battery or a power supply, is connected to the electrodes of the cell. It supplies an external source of electrons to the system.

During electrolysis, the positive electrode, known as the anode, attracts negatively charged ions (anions) and undergoes oxidation, losing electrons. The negative electrode, called the cathode, attracts positively charged ions (cations) and undergoes reduction, gaining electrons. The power source supplies the electrons needed for these reactions to occur.

Overall, the power source ensures a continuous flow of electrons through the circuit, enabling the electrolytic process to take place and facilitate the desired chemical transformations.

Answer: Im not sure but i think its B

Explanation: Its hard to explain so im

not gonna do it

Taking into account the definition of strong acid, pH and pOH, it is obtained that the correct option is option A) [H₃O⁺]= 5.5×10⁻² M, [OH⁻]= 1.82×10⁻¹³ M, pH= 1.26

It is called strong acid, that acid that dissociates completely in solution at constant temperature and pressure. Under these conditions, the concentration of a strong acid is equal to the concentration of hydrogen ions (Hydronium or H₃O⁺). In other words, a strong acid is an acid that completely dissociates into hydrogen ions and anions in solution.  

Hydrobromic acid HBr is a strong acid, so a concentration of 0.055 M of the acid generates a H₃O⁺ concentration of the same value. This is:

[HBr]= [H₃O⁺]= 0.055 M= 5.5×10⁻² M

On the other hand, pH is a measure of acidity or alkalinity that indicates the amount of hydrogen ions present in a solution or substance. Mathematically it is calculated as the negative logarithm in base 10 of the activity of hydrogen ions:

pH= -log [H₃O⁺]

Being [H₃O⁺]= 5.5×10⁻² M, the pH in this case is:

pH= -log (5.5×10⁻² M)

Solving:

pH= 1.26

Similarly, pOH is defined as the negative base 10 logarithm of the activity of the OH⁻ ions:

pOH= - log [OH⁻]

The following relationship can be established between pH and pOH:

pH + pOH= 14

Then, being pH = 1.26, the pOH is calculated by:

1.26 + pOH= 14

pOH= 14 - 1.26

pOH= 12.74

Replacing in the definition of pOH:

12.74= - log [OH⁻]

and solving you get:

[OH⁻]= 1.82×10⁻¹³ M

Finally, the correct option is option A) [H₃O⁺]= 5.5×10⁻² M, [OH⁻]= 1.82×10⁻¹³ M, pH= 1.26

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The balanced chemical equation predicts a reaction between 4.6 moles of chlorine gas and 4.6 moles of hydrogen gas. In chemical equations, the factors are represented by symbols.

H2 (g) + Cl2 (g) 2 HCl is the equation for the balanced reaction.

According to the reaction's stoichiometry, which describes the proportions of reagents and products in a chemical equations, the following amounts of the compounds are involved in the reaction:

H₂: 1 mole

1 mole, chlorine

2 moles HCl

The rule of three can then be used as follows: 4.6 moles of H2 react with 1 mole of chlorine, so how many moles of CL2 do 4.6 moles of H2 react with,(4.6 moles of H2*1 mole of Cl2)/1 mole of H2 moles = moles of CL2.

moles of H2 = 4.6 moles

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Prediction 1 best shows what the population could look like after many generations. Because, the long beak traits is having more life time.

Each characteristics in a living thing is created by a respective genetic coding in its body. The genetic code which is responsible for a particular behavior or appearance is called a genetic trait.

Here, the prediction 1 is best . It already saying that long-beak hummingbirds are more likely to survive, that baby survived long enough to pass on its mutation, so the long-beak trait became more common over generations.

Prediction 2 says abut a  genetic trait which is less fit to survive. Hence, cannot affect the next generation population. Therefore, prediction 1 is best.

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Your question is incomplete. But your complete question probably was:

Prediction 1 :Two hummingbirds with short or medium beaks had a baby with a mutation in its genes for the long-beak trait.

Prediction 2 is best. A hummingbird could have been born with a mutation in its genes for the long-beak trait and lived for a little while.

Answer: Raw meat, poultry and seafood. Feces may get onto raw meat and poultry during the butchering process. ...

Raw eggs. ...

Fruits and vegetables.

Explanation:

The balanced chemical equation for the reaction between nitric acid (HNO3) and calcium hydroxide (Ca(OH)2) is:

\(2 HNO_{3} + Ca(OH)_{2} → Ca(NO_{3} )_{2} + 2 H_{2} O\)

According to the equation, 1 mole of calcium hydroxide and 2 moles of nitric acid combine to form 1 mole of calcium nitrate. With the use of this knowledge, we can calculate how much calcium nitrate can be made from the specified quantity of calcium hydroxide.

First, we need to convert the mass of calcium hydroxide to moles:

\(7.65 g Ca(OH)_{2} × (1 mol Ca(OH)_{2} / 74.093 g Ca(OH)_{2} ) = 0.1033 mol Ca(OH)_{2}\)

Since the reaction proceeds with a 67.0% yield, we can calculate the actual amount of calcium nitrate produced:

\(0.1033 mol Ca(OH)_{2} × (2 mol HNO_{3} / 1 mol Ca(OH)x_{2} ) × (1 mol Ca(NO_{3} )2 / 2 mol HNO_{3} ) × 0.67 = 0.0347 mol Ca(NO_{3} )_{2}\)

Finally, we can convert the moles of calcium nitrate to grams:

\(0.0347 mol Ca(NO_{3} )_{2} × 164.088 g Ca(NO_{3} )_{2} /mol = 5.69 g Ca(NO_{3} )_{2}\)

Therefore, the mass of calcium nitrate produced is 5.69 grams.

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Answer:

Ionic compounds conduct electricity when molten (liquid) or in aqueous solution (dissolved in water), because their ions are free to move from place to place. Ionic compounds cannot conduct electricity when solid, as their ions are held in fixed positions and cannot move.

Explanation: