how many grams of calcium hydroxide react to give 2.39 g of ca3(po4)2?

Answer:

they were facing the oppisite ways

Explanation:

The pH values of the solution after the addition of various amounts of acids are as follows:

(a) When 0.0 mL HCl is added; pH = 11.62

(b) After adding 10.0 mL of 0.100 M HCl; pH = 12.38

(c) After adding 30.0 mL of 0.100 M HCl; pH = 14

(d) After adding 40.0 mL of 0.100 M HCl; pH = 2.70

The equation of the reaction between NH₃ and HCl is:

NH₃ + HCl → NH₄Cl

Before the addition of HCl:

The concentration of NH₃ solution = 0.300 M

The initial concentration of OH- can be calculated from the Kb of NH₃ :

Kb = [NH₄⁺][OH⁻] / [NH₃]

1.8 x 10⁻⁵ = x² / 0.300

x = 0.0024 M

The initial concentration of OH⁻ is 0.0024 M, and the initial pH of the solution ill be:

pH = 14 - pOH

pH = 14 - (-log[OH-])

pH = 11.62

(a) When 0.0 mL HCl is added;

pH = 11.62

(b) After adding 10.0 mL of 0.100 M HCl;

moles of HCl added = (0.100 mol/L) x (0.0100 L)

moles of HCl added = 0.00100 mol

The moles of NH₃ initially present = (0.300 mol/L) x (0.0100 L)

moles of NH₃ initially present = 0.00300 mol

the mole ratio of HCl and NH₃ = 1:1

The remaining moles of NH₃ = 0.00300 mol - 0.00100 mol

remaining moles of NH₃ = 0.00200 mol

The volume of the solution is now 10.0 mL + 10.0 mL = 20.0 mL or 0.0200 L.

The new concentration of NH₃ = 0.00200 mol / 0.0200 L

concentration of NH₃ = 0.100 M

The concentration of OH- can be calculated from the Kb of NH₃ using the new concentration of NH4+:

Kb = [NH4+][OH-] / [NH3]

1.8 x 10⁵ = x² / 0.100

x = 0.0042 M

The new concentration of OH- is 0.0042 M, and the new pH will be:

pH = 14 - (-log[OH-])

pH = 12.38

(c) After adding 30.0 mL of 0.100 M HCl;

the volume of the solution is 40.0 mL or 0.0400 L

The moles of HCl added = (0.100 mol/L) x (0.0300 L)

moles of HCl added = 0.00300 mol

moles NH3 reacted = 0.00300 mol - 0.00300 mol

moles NH3 reacted = 0.00000 mol

[NH₄⁺] remaining [OH⁻] = 0

The concentration of OH- is 0 M, so the pH = 14 - (-log[OH-])

pH = 14

(d) After adding 40.0 mL of 0.100 M HCl;

moles HCl = (0.100 mol/L) x (0.0400 L)

moles HCl = 0.00400 mol

The volume of solution = 0.050 L

All NH₃ has reacted and the remaining moles of HCl = (0.00400 mol - 0.00300 mol) / 0.0500 L

the remaining moles of HCl = 0.00200 M

The concentration of H₃O⁺ can be calculated from the concentration of HCl:

0.00200 M HCl produces 0.00200 M H₃O⁺

pH = -log[H₃O⁺]

pH = -log(0.00200)

pH = 2.70

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Answer:

86

Explanation:

20 plus 9 equals 29 minus 10 equals 19 plus 67 equals 86

Answer:

86

Explanation:

20+9=29

29-10=19

19+67=86

Answer:

the number of valence electrons also determines whether they tend to give up or gain electrons in chemical reactions.

Answer:

Indirect (B)

Explanation:

When one facter increases the other decreases.

Answer:

INDIRECT- when one factor increases, the other decreases

A

Ek = 1/2*m*V^2

Take ideal gas for example, the Vrms is (3RT/M)^1/2. Ek is proportional to T.

Therefore, Ek is the lower at the low temperature. Another perspective is the average kinetic energy. The average kinetic energy is equal to (3/2)RT, so the average kinetic energy is proportional to temperature.

Answer

A compound made of two ions.

Explanation

A binary compound is a compound formed from two different elements. There may or may not be more than one of each element.

For a binary ionic compound, a metal will always be the first element in the formula, while a nonmetal will always be the second.

Hence, a binary ionic compound is a compound made of two ions.

Answer:

Surface mining (also known as "strip mining") has the potential to significantly erode soil fertility, pollute waters, deplete underground water sources, scar or altar the landscape, damage roads, houses, and other buildings, and kill wildlife.

7 days old hahahshahah

The correct answer to the first part of your question is option (c): Energy is released by water vapor as it condenses.

When water vapor condenses into liquid water, it undergoes a phase change from a gaseous state to a liquid state. During this phase change, energy is released in the form of latent heat. This release of energy occurs because the water molecules in the vapor phase are more energetic and have higher kinetic energy compared to the water molecules in the liquid phase.

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Applejack, traditionally made through freeze distillation, is a method that utilizes the principles of crystal fractionation to concentrate the alcohol content in the beverage. Unlike apple brandy, which involves heating the alcohol-water mixture to separate the alcohol, applejack relies on freezing the mixture instead.

The process of making applejack using crystal fractionation involves the following steps:

1. Start with a fermented apple cider: Begin by fermenting apple juice or cider using yeast, allowing the natural sugars in the apples to convert into alcohol. The resulting fermented cider will have a relatively low alcohol content.

2. Freezing the cider: Transfer the fermented cider to a container that is suitable for freezing, such as a large, wide-mouthed vessel. Place the container in a cold environment, such as a freezer, and allow it to freeze slowly.

3. Fractionation: As the cider freezes, the water content in the mixture forms ice crystals, while the alcohol remains in the liquid state. The frozen ice crystals, which have a lower alcohol content, can be removed from the container, separating them from the alcohol-rich liquid.

4. Thawing and repeating the process: Thaw the remaining liquid, which is now more concentrated in alcohol. Repeat the freezing process multiple times to further concentrate the alcohol content. Each freeze-thaw cycle increases the alcohol concentration, gradually transforming the cider into applejack.

5. Final concentration and aging: Once the desired alcohol concentration is achieved, the applejack can be further aged, allowing the flavors to develop and mellow over time. This aging process can be done in barrels or other suitable containers.

It's important to note that the freeze distillation method used to produce applejack concentrates not only the alcohol but also any impurities or undesirable compounds present in the cider. Therefore, it is crucial to ensure that the starting cider used for fermentation is of high quality and free from any contaminants.

Additionally, it's worth mentioning that freeze distillation is regulated or prohibited in some jurisdictions due to potential safety concerns. It is always advisable to check local laws and regulations before attempting to make applejack or any other distilled beverage using this method.

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Answer:

here

Explanation:

This is the electron configuration of the element carbon.

The percentage decrease in the amount of dissolved oxygen is 10%

Percent yield is the percent ratio of actual yield to the theoretical yield. It is calculated to be the experimental yield divided by theoretical yield multiplied by 100%. If the actual and theoretical yield ​are the same, the percent yield is 100%

In chemistry, yield is a measure of the quantity of moles of a product formed in relation to the reactant consumed, obtained in a chemical reaction, usually expressed as a percentage.

From the graph,

The amount of dissolved oxygen at  15°C is 10 mg/L

The amount of dissolved oxygen at  20°C is 9 mg/L

The decrease in the amount of dissolved oxygen is 1mg/L

The percentage decrease = (1/10) × 100 = 10%

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Answer:

A dam like structure used to capture energy from masses of water moving in or out of a bay of rivers due to tidal force is called tidal barrage.

Explanation:

It may help you to solve question.

The muscles of the stomach crush food that has entered the stomach cavity is a physical change. The correct option is D. a physical change.

Digestion is the breakdown of food material in the stomach, which produce energy.

Digestion includes a chemical and physical process. The food is digested by the chemicals present in the stomach.

Thus, the correct option is D. a physical change, only.

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Nuclear fusion in stars, such as our Sun, produces energy through the fusion of light atomic nuclei, mainly hydrogen, into heavier nuclei like helium. This fusion process releases a tremendous amount of energy.

Within the core of a star, where temperatures and pressures are extremely high, nuclear fusion takes place. The collisions between hydrogen atoms at such high temperatures provide the necessary energy to overcome electrostatic repulsion, enabling the fusion process.

In the proton-proton chain, the most common fusion process in stars, hydrogen nuclei combine to form helium nuclei through several reactions. The conversion of a small fraction of mass into energy, as described by Einstein's mass-energy equivalence, results in the release of energy in the form of gamma rays.

These high-energy photons interact with matter, gradually transforming into light and heat. This energy release sustains the star's stability by countering gravitational collapse and powers its luminosity for billions of years.

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The variance in the US continental region is brought on by the shift in daytime and nighttime weather patterns.

Cold, dry, and stable air masses are found in the continental polar (cP) or continental arctic (cA) regions. Radiative cooling causes these air masses to form over northern Canada and Alaska. They travel south, then east via the Plains and the Rockies.

During the winter, a continental polar air mass can develop over the land. It comes from northern Canada or Alaska in the Northern Hemisphere. It transports dry weather to the United States as it goes south. Low humidity and temperature are both present.

These factors contributed to the polar air mass:

During the colder months of the year, continental polar air typically forms over vast land masses.

A cool breeze blows across the upper section of the area, while a warm breeze blows through the lower part.

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The given reaction is already balanced, that is to say tha the number of atoms in the reactants matches the number of atoms in the products. In the reaction, we can see the relationship between CaC2 and H2O. For each mole of CaC2 two moles of H2O react.

So, if 4.8 moles of CaC2 are consumed the moles of H2O needed will be:

Mol of H2O = Mol of CaC2 x 2

Mol of H2O = 4.8 x 2 = 9.6 mol of H2O

Now, to calculate the grams of H2O we will use the following equation and the mass molar of H2O.

Mass molar of H2O =18.01 g/mol

So, if 4.8 moles of CaC2 are consumed in this reaction, 172.9 g of H2O are needed

Yes, sulfur and sodium will form an ionic compound. The empirical formula of the compound formed is Na2S.

When two elements form an ionic compound, one element is usually a metal and the other is a non-metal. Ionic compounds are formed when electrons are transferred between the two elements. In the given pairs, sulfur and iodine, sodium and chlorine and lithium and bromine all contain one metal and one non-metal and therefore are likely to form ionic compounds. The empirical formulas of these compounds are

I2S, NaCl and LiBr, respectively.

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Carbohydrates usually contain a carbonyl (=O) and hydroxyl (−OH) functional group.

Carbonyl (=O) and hydroxyl (=OH) functional groups are typically present in carbohydrates. In polysaccharides, where the hydroxyl groups typically establish hydrogen bonds with the carbonyl groups, the carbonyl group joins with a carbon atom to form a ring structure. Amino, carboxyl, and R are the functional groups found in proteins (variant). Note: Complex assemblies are created when proteins interact with other biological macromolecules and one another.

Based on the functional monomer found in carbs, this classification was created. Ketone and aldehyde serve as monomers in carbohydrates. That suggests that carbs are divided into aldose and ketose. Depending on how many carbon atoms there are, carbohydrates can be divided into numerous categories.

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Answer:

Average atomic mass  = 20.180 amu.

Explanation:

Given data:

Abundance of X-20 = 90.48%

Atomic mass of X-20 = 19.992 amu

Abundance of X-21 = 0.27%

Atomic mass of X-21 = 20.994 amu

Abundance of X-22 =  9.25%

Atomic mass of X-22 = 21.991 amu

Average atomic mass = ?

Solution:

Average atomic mass  = (abundance of 1st isotope × its atomic mass) +(abundance of 2nd isotope × its atomic mass) +(abundance of 3rd isotope × its atomic mass)   / 100

Average atomic mass = ( 90.48×19.992)+(0.27×20.994)+(9.25+ 21.991 ) /100

Average atomic mass = 1808.88  + 5.668+203.42 / 100

Average atomic mass  = 2017.968 / 100

Average atomic mass  = 20.180 amu.

To determine the ratio of moles between C3H8 (propane) and C4H10 (butane) in the original mixture, we need to use the stoichiometry of the combustion reaction and the given amounts of CO2 and H2O produced.

First, let's calculate the moles of CO2 and H2O produced:

Molar mass of CO2 = 12.01 g/mol (C) + 2 * 16.00 g/mol (O) = 44.01 g/mol

Moles of CO2 = 3.74 g / 44.01 g/mol ≈ 0.085 mol

Molar mass of H2O = 2 * 1.01 g/mol (H) + 16.00 g/mol (O) = 18.02 g/mol

Moles of H2O = 1.98 g / 18.02 g/mol ≈ 0.11 mol

Next, we can set up the balanced equation for the combustion of propane (C3H8) and butane (C4H10):

C3H8 + 5O2 → 3CO2 + 4H2O (propane)

C4H10 + 6.5O2 → 4CO2 + 5H2O (butane)

From the balanced equations, we can see that for every 3 moles of CO2 produced, there are 1 mole of C3H8 and for every 4 moles of CO2 produced, there are 1 mole of C4H10.

Now, we can calculate the moles of C3H8 and C4H10 based on the moles of CO2 produced:

Moles of C3H8 = 0.085 mol * (1 mol C3H8 / 3 mol CO2) ≈ 0.0283 mol

Moles of C4H10 = 0.085 mol * (1 mol C4H10 / 4 mol CO2) ≈ 0.0213 mol

Therefore, the ratio of moles between C3H8 and C4H10 in the original mixture is approximately 0.0283 mol : 0.0213 mol, which simplifies to 1.33 : 1 (or approximately 4 : 3).

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According to molar concentration, four liters of solvent would be needed to create a 5.5 M solution from 22 moles of sodium chloride.

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.

The molar concentration depends on change in volume of the solution which is mainly due to thermal expansion. 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. Substitution of values in formula gives, volume= 22/5.5=4 liters.

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a. There are 1.85 moles in 2.00 × 10² g of silver (Ag).

b. There are 0.618 moles in 37.1 g of silicon dioxide (SiO₂)

The molar mass is the mass in grams of 1 mole of particles, that is, the mass in grams of 6.02 × 10²³ particles. The units are g/mol.

We want to calculate the number of moles represented by different masses of different substances. In each case, the conversion factor between mass and moles is the molar mass.

The molar mass of silver is 107.87 g/mol.

2.00 × 10² g × (1 mol/107.87 g) = 1.85 mol

The molar mass of silicon dioxide is 60.08 g/mol.

37.1 g × (1 mol/60.08 g) = 0.618 mol

a. There are 1.85 moles in 2.00 × 10² g of silver (Ag).

b. There are 0.618 moles in 37.1 g of silicon dioxide (SiO₂)

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Answer:

It has two sigma bonds ( the single bonds between each H and C) plus one pi bond and one sigma bond that consitute the double bond between C and O. It contains three covalent bonds, one . Hydrogen Bond Donor Count: 0: Computed by Cactvs 3.4.

Explanation:

Hope it helps you!

Answer:

72 electrons

Explanation:

The 6th shell could hold up to 2(6)² = 2(36) = 72 electrons

The amide produced from pentanoic acid and ammonia is pentanamide. To form this amide, pentanoic acid reacts with ammonia in a process called amidation.

Here's a step-by-step explanation:

1. Pentanoic acid (C4H9COOH) has a carboxyl group (-COOH) at one end.

2. Ammonia (NH3) has a lone pair of electrons on the nitrogen atom, making it a nucleophile.

3. The nitrogen atom in ammonia attacks the carbonyl carbon atom in pentanoic acid, forming a tetrahedral intermediate.

4. The intermediate collapses, expelling a hydroxyl group (-OH) from the carboxyl group and forming a new bond between the nitrogen and carbonyl carbon atoms.

5. The product is pentanamide (C4H9CONH2), an amide formed from pentanoic acid and ammonia.

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the particular gas effusion was 21.0. and the methane effusion rate is 47.0 The molar mass of the unknown gas is approximately 28.6 g/mol

The process through which a gas manages to escape through with a small hole or highly permeable barrier is known as effusion. A gas's rate of effusion is inversely proportional to its molar mass squared. The following equation describes this relationship: rate1 / rate2 = (sqrt(molar mass2) / sqrt(molar mass1)). where rate1 and rate2 are the rates of effusion of the two gases and molar mass1 and molar mass2 are the molar masses of the two gases.Given the rate of effusion of the unknown gas is 21.0 mL/min, and the rate of effusion of pure methane (CH4) is 47.0 mL/min, we can use the above equation to find the molar mass of the unknown gas:

(21.0 mL/min) / (47.0 mL/min) = sqrt(molar mass unknown) / sqrt(16.04 g/mol)

Squaring both sides of the equation, we get:

(21.0 mL/min)^2 / (47.0 mL/min)^2 = (molar mass unknown) / (16.04 g/mol)

Solving for molar mass unknown we get:

molar mass unknown = (16.04 g/mol) * (21.0 mL/min)^2 / (47.0 mL/min)^2

The molar mass of the unknown gas is approximately 28.6 g/mol

Please note that the above calculation is based on the assumption that the temperature and pressure are the same for both gases and that the gases are ideal

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