O Macmillan Learning
A hydrate of cobalt(II) chloride had a mass of 238.0 g before heating. After heating, the anhydrous CoC1, weighed 130.7 g.
What is the mass of the water that was removed by heating?
mass of the water =
How many moles of water were removed by heating?
moles of the water =
How many moles of anhydrous CoCl, remain?
moles of CoCl₂ =
What is the hydration number (moles of water per mole of compound)?
hydration number=
mol
mol

INFORMATION:

We know that:

- An automobile airbag inflates when NaN3 is converted to Na and N2 gas according to the equation,

2NaN3 → 2 Na + 3 N2.

And we must find the volume in (L) of N2 if 143 g of NaN3 completely reacted at STP

STEP BY STEP EXPLANATION:

To find it, we need to work with the conditions as an ideal gas.

The ideal gas equation is

1. We must find n:

To find n, we must first divide the 143 g of NaN3 by the molar mass

So, we have 2.2 mol of NaN3

Now to find n, we must multiply the number of mol of NaN3 by the relation between NaN3 and N2

Then, n = 3.3 mol

2. using STP conditions:

- T = 273K

- P = 760 torr

And using R = 62.36 (L*torr)/(K*mol)

Finally, replacing in the ideal gas equation solver for V

So, 73.92 L of N2 would be produced if 143 g of NaN3 completely reacted at STP.

ANSWER:

73.92 L

To calculate the moles of water produced by the reaction of ammonia, we need to use the balanced chemical equation:

4 NH3 (g) + 5 O2 (g) → 4 NO (g) + 6 H2O (g)

From the equation, we can see that for every 4 moles of ammonia (NH3) that react, 6 moles of water (H2O) are produced.

Therefore, to calculate the moles of water produced, we need to know the number of moles of ammonia that reacted. Let's assume that 2 moles of ammonia were used in the reaction.

Using the ratio from the balanced equation, we can calculate the moles of water produced:

2 moles NH3 × (6 moles H2O/4 moles NH3) = 3 moles H2O

Therefore, the detailed answer is that 3 moles of water were produced by the reaction of 2 moles of ammonia. The unit symbol for moles is "mol". The answer should be rounded to the correct number of significant digits, but since the question did not specify the number of significant digits required, we cannot provide a specific answer for that.

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Answer:

carbon dioxide

C = carbon

O2 = dioxide

The options describe a covalent species that has four electron groups around the central atom are

А covаlent bond in chemistry is а chemicаl link between two аtoms or ions in which the electron pаirs аre shаred between them. А covаlent bond mаy аlso be termed а moleculаr bond. Covаlent bonds form between two nonmetаl аtoms with identicаl or relаtively close electronegаtivity vаlues. This type of bond mаy аlso be found in other chemicаl species, such аs rаdicаls аnd mаcromolecules.

The electron pаirs thаt pаrticipаte in а covаlent bond аre cаlled bonding pаirs or shаred pаirs. Typicаlly, shаring bonding pаirs аllows eаch аtom to аchieve а stаble outer electron shell, similаr to thаt seen in noble gаs аtoms.

Your question is incomplete,  but most probably your full options were

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The molarity of an HCl solution if 41.73 mL of HCl reacts with 7.8111 grams of sodium carbonate is 1.77M. Details about molarity can be found below.

The molarity of a solution can be calculated by dividing the number of moles of the substance by its volume.

According to this question, 7.8111 grams of sodium carbonate (106 g/mol) is given. The number of moles of sodium carbonate is calculated as follows:

no of moles = 7.811g ÷ 106g/mol = 0.074mol

Molarity of HCl = 0.074mol ÷ 0.04173L

Molarity of HCl = 1.77M

Therefore, the molarity of an HCl solution if 41.73 mL of HCl reacts with 7.8111 grams of sodium carbonate is 1.77M.

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In both cases of water boiling on a stove and water vapor condensing on a bathroom mirror, the water remains chemically the same; only its physical state changes.

Boiling occurs when water reaches its boiling point, which is the temperature at which its vapor pressure equals atmospheric pressure. This causes the water to rapidly convert from a liquid to a gas, releasing steam.

Water vapor condenses on a bathroom mirror when the water vapor in the air comes into contact with the cooler surface of the mirror. The cooling effect of the mirror causes the water vapor to lose energy, which causes the water molecules to come together and form droplets.

This causes the water to rapidly convert from a gas to a liquid, creating condensation. In both cases, the changes in the water's physical state are due to changes in the temperature and pressure of the environment.

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Answer:

\(C_A=0.144M\)

Explanation:

Hello,

In this case, given the rate constant, we infer this is about a second order reaction, whose equation is:

\(\frac{dC_A}{dt}=kC_A^2\)

Thus, by integration we obtain:

\(\frac{1}{C_A}= \frac{1}{C_A_0}+kt\)

Hence, we solve for the final concentration after 0.385 s:

\(\frac{1}{C_A}= \frac{1}{0.155M}+\frac{1.308}{Ms} *0.385s=\frac{6.955}{M}\\ \\C_A=\frac{M}{6.955} \\\\C_A=0.144M\)

Best regards.

Answer:

The Sun gives off UV radiation and heat waves, when tilted closer, it is closer to that UV radiation and heat waves.

For example, if you put a heat lamp closer to a rock the rock would get warmer, if you put it further away it would receive less heat therefore making less warmer.

Answer:

There are main six noble gases in the periodic table. The filling of 4f-orbitals occurs after 6s orbitals. The noble gas that belongs to the sixth period is Radon. Its electronic configuration is [ X e ] 6 s 2 4 f 14 5 d 10 6 p 6  .

Therefore, the name of noble gas is Radon.

Answer:

N(CO2) = n(CO2) x Avogadros constant

n(CO2) = mass(CO2)/Molar mass(CO2) = 112/44 = 2.5454….

N(CO2) = 2.545454… x (6.02 x 10^23) = 1.5323636 x 10^24

Therefore, the number of CO2 molecules in 112 g of CO2 = 1.53 x 10^24 molecules

1.53 × 10²⁴ molecules CO₂

Math

Pre-Algebra

Order of Operations: BPEMDAS

Chemistry

Atomic Structure

Stoichiometry

Step 1: Define

112 g CO₂

Step 2: Identify Conversions

Avogadro's Number

[PT] Molar Mass of C - 12.01 g/mol

[PT] Molar Mass of O - 16.00 g/mol

Molar Mass of CO₂ - 12.01 + 2(16.00) = 44.01 g/mol

Step 3: Convert

Step 4: Check

Follow sig fig rules and round. We are given 3 sig figs.

1.53252 × 10²⁴ molecules CO₂ ≈ 1.53 × 10²⁴ molecules CO₂

The two elements that are more likely to lose 2 electrons, are calcium and gallium while the element that is more likely to lose 3 electrons is indium.

Valence electrons are any of the electrons in the outermost shell of an atom; capable of forming bonds with other atoms.

The number of valence electrons of an atom of element will determine the number of electrons that element can lose in a reaction with other atoms.

Therefore, the two elements that are more likely to lose 2 electrons, are calcium and gallium while the element that is more likely to lose 3 electrons is indium.

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Answer:energy is emitted as electromagnetic radiy

Explanation:

Answer:

B

Explanation:

2.3 kilograms of tio2 can be prepared from 5.45 kg of ticl4.

The given problem states to calculate the kilograms of TiO2 that can be prepared from 5.45 kg of TiCl4.

The balanced chemical equation of the reaction between TiCl4 and H2O is as follows:

TiCl4 + 2H2O = TiO2 + 4HCl

Molar mass of TiCl4 = 189.68 g/mol

Molar mass of TiO2 = 79.87 g/mol

As per the stoichiometry of the balanced chemical equation, 1 mol of TiCl4 gives 1 mol of TiO2.

Therefore, the molar ratio of TiCl4 to TiO2 is 1:1.

Using the molar masses of TiCl4 and TiO2 and the given mass of TiCl4, we can calculate the number of moles of TiCl4 as follows:

Number of moles of TiCl4 = (mass of TiCl4) / (molar mass of TiCl4)

= 5.45 kg / 189.68 g/mol

= 28.762 mol

Since the molar ratio of TiCl4 to TiO2 is 1:1, the number of moles of TiO2 formed will also be 28.762 mol.

Mass of TiO2 = (number of moles of TiO2) × (molar mass of TiO2)

= 28.762 mol × 79.87 g/mol

= 2300.16 g

= 2.3 kg

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Answer:

2457.6

Explanation:

I calculated the answer and got it right.

In an electrolytic cell, a chloride ion would migrate through the solution to the positive electrode.

In an electrolytic cell, ions follow a specific path depending on their electronegativity and the location of electrode reactions.

From a general perspective, cations (positively charged ion) head towards the negatively charged electrode known as cathodes since this is where reduction takes place. Here they receive electrons resulting in their transformation into neutral atoms or molecules.

On the contrary, anions (negatively charged ion) will migrate towards positive electrodes - namely anodes - as these are sites for oxidation which entails loss of electrons to produce uncharged forms. In this case, chloride ion is negatively charged ion.

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a) Subscript (s) means solid or precipitate.

b) CdSO₄ (aq) → Cd²⁺ (aq) + SO₄²⁻(aq) and K₂S(aq) → 2K⁺ (aq) + S²⁻ (aq). There are 4 types of ions present in the solution Cd²⁺, SO₄²⁻, 2K⁺ and S²⁻.

c) Yellow to orange color precipitate will be seen after this reaction.

d) The reaction is known as double displacement or a precipitation reaction.

e) 2K⁺ and SO₄²⁻ are the ions still present in the solution.

The detailed answer to the questions related to the given equation are as follows:

Given equation: CdSO₄ (aq) + K₂S (aq) → CdS (s) + K₂SO₄ (aq)

a) The subscript (s) means "solid." In this reaction, CdS is a solid product formed by the reaction of aqueous CdSO₄ and K₂S.

b) When cadmium sulfate (CdSO₄) dissolves in water, it dissociates into ions:

CdSO₄ (aq) → Cd²⁺ (aq) + SO₄²⁻ (aq)

Similarly, when potassium sulfide (K₂S) dissolves in water, it dissociates into ions:

K₂S (aq) → 2K⁺ (aq) + S²⁻ (aq)

In this solution, there are four types of ions are present: Cd²⁺, SO₄²⁻, 2K⁺, and S²⁻.

c) Cadmium sulfide (CdS) has a yellow to orange color and is insoluble in water. When you mix cadmium sulfate (CdSO₄) and potassium sulfide (K₂S), you would expect to see a yellow to orange precipitate forming, which is cadmium sulfide (CdS).

d) The name for this type of reaction is a double displacement reaction or a precipitation reaction.

e) After the reaction, the soluble product potassium sulfate (K₂SO₄) is formed, which dissociates into ions in the solution. The ions still present in the solution after the reaction are: 2K⁺ (aq) + SO₄²⁻ (aq).

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The mass of \(Al_{2} S_{3}\) produced is 15.616 grams.

The reaction taking place is as follows:

\(2Al+ 3S\) →\(Al_{2} S_{3} (s)\)

Moles of Al = mass/molar mass = 10.0g/27.0g/mol

= 0.370 mol

Moles of S = mass/molar mass = 15.0g/(32.065g/mol)

= 0.468 mol

Al and S reacts in the molar ratio of 2:3.

2 moles of Al reacts with 3 moles of S

0.370 moles of Al will react with S = (3/2)*0.370mol

= 0.555 mol

Similarly, 0.468 moles of S will react with Al = 2/3 *0.468mol

= 0.312 mol

Thus, Al is in excess and S is the limiting reactant (some of Al will be left over ,S will completely react)

So, moles of \(Al_{2} S_{3}\) produced=1/3*0.312 mol of S

= 0.104 mol

Mass of \(Al_{2} S_{3}\) produced = moles*molar mass of \(Al_{2} S_{3}\)

= 0.104mol*150.158g/mol

= 15.616 grams

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The fundamental frequency of sound in helium if the pipe is filled with it at the same temperature will be 766.13 Hertz.

A certain organ pipe which is open at both the ends, produces a fundamental frequency equal to 285 Hz in air. It can be considered that the length of the pipe is L. Its wavelength will be represented as:

λ = 2L -- (eq 1)

The frequency of sound will be given as

f = v / λ, where f is the frequency, v is the velocity of sound in air and λ is the wavelength. Replacing the value of λ from equation 1.

285 = 331.29/ 2L

L = 0.5812 m

Let us assume that v' is the velocity of sound in helium. Then,

v/v' = \(\sqrt{m'}\)/\(\sqrt{m}\) , where, m is the molar mass of air and m' is the molar mass of helium.

v' = 331.29/ 0.372

v' = 890.56 m/s

To calculate the fundamental frequency of sound is helium,

f' = v' / λ

f' = 890.56 / 2 × 0.5812

f' = 766.13 hertz

So, the fundamental frequency of sound is helium is 766.13 hertz.

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Answer: During succession, new species move into an area and colonize it.

Explanation: Ecological succession refers to the process of change in the composition and structure of an ecosystem over time. It occurs due to the interactions between the biotic (living) and abiotic (non-living) components of an environment. As succession progresses, new species gradually establish and thrive in the area, leading to a change in the species composition. This process can occur over a long period of time, ranging from decades to centuries, depending on various factors such as environmental conditions and the specific type of succession.

True. The formation of an ionic compound from the metal strontium and the nonmetal chlorine can be represented using electronic configurations, orbital rotation, and electron dot structures.

Strontium is a metal that has the electronic configuration of [Kr] 5s2, and chlorine is a nonmetal with the electronic configuration of [Ne] 3s2 3p5. When they form the ionic compound, strontium will lose two electrons from its outer shell to become a positively charged ion (Strontium ion), while chlorine will gain one electron from its outer shell to become a negatively charged ion (Chloride ion). This will result in the formation of the ionic compound, Strontium Chloride, with the electronic configuration of [Kr] 5s1 and [Ne] 3s2 3p6, respectively.

The electron dot structure of Strontium Chloride is written as [Strontium] + [Chlorine] -, indicating that the Strontium ion is surrounded by the Chloride ion. The orbital rotation of Strontium Chloride shows how the two atoms of Strontium and Chlorine are held together by ionic bonds.

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Answer:

Solid

Liquid

Gas

Hope this helps :)

- jp524

To form one formula unit of Al2O3, a total of 12 electrons (6 from aluminum and 6 from oxygen) must be transferred.

The compound Al2O3, commonly known as aluminum oxide, is formed when two aluminum atoms and three oxygen atoms bond. To determine the number of total electrons that must be transferred to form one formula unit of Al2O3, we first need to find the number of electrons that are present in one formula unit of Al2O3.

Aluminum has an atomic number of 13, which means it has 13 protons and 13 electrons in a neutral atom. Each aluminum atom in Al2O3 contributes 3 electrons, and since there are two aluminum atoms in one formula unit of Al2O3, the total number of electrons contributed by aluminum atoms is 6.

Oxygen has an atomic number of 8, which means it has 8 protons and 8 electrons in a neutral atom. Each oxygen atom in Al2O3 contributes 2 electrons, and since there are three oxygen atoms in one formula unit of Al2O3, the total number of electrons contributed by oxygen atoms is 6.

Therefore, to form one formula unit of Al2O3, a total of 12 electrons (6 from aluminum and 6 from oxygen) must be transferred.

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Answer:

1.82

Explanation:

pH is given by the equation

The formula 4CH₄ represents option C) 4 molecules, each containing a carbon atom and 4 hydrogen atoms. The "4" outside the formula indicates that there are four of these molecules present.

The formula for methane gas is CH₄, which means that a single molecule of methane contains one carbon atom and four hydrogen atoms. When we write 4CH₄, the "4" outside the formula indicates that there are four molecules of CH₄ present. So, there are a total of four carbon atoms and sixteen hydrogen atoms in this scenario, but they are distributed across four molecules of CH₄.

Therefore, option B is incorrect. Option A is also incorrect because there is only one carbon atom in each molecule of CH₄. Option D is incorrect because methane is an organic compound with covalent bonds.

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The following statements are true:

a. benzoic acid forms a water-soluble salt, whereas naphthalene does not.

b. naphthalene is more soluble in diethyl ether than is sodium benzoate. c. a criterion for a dry organic solution is that the solution is not cloudy.

and false is:

d. drying agents need not be removed prior to removing solvents when isolating products.

a. True (T): Benzoic acid is a carboxylic acid and can form water-soluble salts, such as sodium benzoate, through reaction with a base like sodium hydroxide. Naphthalene, on the other hand, is a nonpolar compound and does not readily form water-soluble salts.

b. True (T): Naphthalene is a nonpolar compound and is more soluble in nonpolar solvents like diethyl ether. Sodium benzoate, being a water-soluble salt, is more soluble in polar solvents like water.

c. True (T): A criterion for a dry organic solution is that it is not cloudy. Cloudiness in an organic solution can indicate the presence of water or other impurities.

d. False (F): Drying agents, such as silica gel or molecular sieves, are used to remove traces of water from organic solvents. However, they need to be removed prior to isolating the products because they can interfere with the purity and yield of the final product. Drying agents can adsorb the product or react with it, so it is important to remove them before further processing or analysis.

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The total mass of the particles produced by nuclear fission is less than the total mass of the particles before the reaction because of the conversion of mass to energy according to Einstein's famous equation E=mc^2.

During nuclear fission, the nucleus of an atom is split into two smaller nuclei, releasing a large amount of energy in the process. This energy is equivalent to the mass that is lost during the reaction, as per Einstein's equation. Therefore, the total mass of the particles after the reaction is less than the total mass before the reaction. This phenomenon is known as mass -energy equivalence.

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Answer:

x is 2

Explanation:

2HCl + Na2O •••••• 2NaCl + Hcl

Answer:

\( \sf{\blue{\fbox{B.{\green{ \: Law \: of \: Conservation \: of \: Mass}}}}}\)