How many grams are in 4.50x1023 molecules of CO2? [Molar mass CO2 = 44.01 g/mol CO2]
7.48x10-11 g CO2

32.9 g CO2
44.01 g CO2

6.16x1045 g CO2

The given nuclear reactions can be completed based on the atomic number of and mass number of the reactant and product given. The first reaction is completed as:

[tex]\rm _{90}^{234} Th \rightarrow _{90}^{234} Th + _{0}^{0} \gamma[/tex]

Heavy unstable radioactive nuclei undergo nuclear reactions by the absorption or emission of charged particles.

The first nuclear reaction given in the table is giving the same thing with no change in mass number and atomic number. Thus, it is a gamma decay of thorium -234 as written above.

The second nuclear reaction is the positron emission by oxygen as follows:

[tex]\rm _{8}^{15} O \rightarrow _{7}^{15} N + _{+1}^{0} e[/tex]

Here, the atomic number decreases by one unit in the product.

For the last nuclear reaction given, it describes, beta decay of boron to form nitrogen as written below, where the atomic number increases by one.

[tex]\rm _{6}^{14} B \rightarrow _{7}^{14} N + _{-1}^{0}e[/tex]

Similar way, other nuclear reactions can be completed.

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Answer:

The statement that is true about dilute and concentrated solutions is: Dilute solutions have a higher solvent-to-solute ratio than concentrated solutions.

Explanation:

In dilute solutions, the amount of solute is relatively low compared to the amount of solvent. Conversely, in concentrated solutions, the amount of solute is relatively high compared to the amount of solvent.

For example, if you add a teaspoon of sugar to a cup of water, you have a dilute solution. If you add five teaspoons of sugar to the same cup of water, you have a concentrated solution.

So, the correct statement is that dilute solutions have a higher solvent-to-solute ratio than concentrated solutions.

Answer:

Dilute solutions have a higher solvent-to-solute ratio than concentrated

solutions.

Explanation:

Explanation:

The atomic number of calcium (Ca) is 20, which means it has 20 protons and normally has 20 electrons to balance the charge. However, the ion given in the question is Ca²⁺, which means it has lost two electrons and has a 2+ charge.

To find the number of neutrons in an atom or ion, you subtract the number of protons from the mass number. The mass number of calcium is approximately 40, which means it has 20 neutrons.

Therefore, the number of protons, neutrons, and electrons in the Ca²⁺ ion is:

Protons: 20

Neutrons: 20

Electrons: 18

So the correct answer is option B: 20 protons, 26 neutrons, and 18 electrons.

The element Calcium (Ca) has 20 protons. The 46 Ca²+ ion has a mass number of 46, indicating it has 26 neutrons (46-20). The ²+ charge shows it has lost 2 electrons, so it has 18 electrons. The correct answer is B: 20 protons, 26 neutrons, and 18 electrons.

The element given here is Calcium (Ca) which has an atomic number of 20. The atomic number is equal to the number of protons, so Calcium has 20 protons (pt). The symbol 46 Ca²+ indicates that this is an ion with a mass number of 46. The mass number is the total of protons and neutrons, so to find the number of neutrons we subtract the number of protons from the mass number: 46 - 20 = 26 neutrons (nº). A ²+ charge means it has lost 2 electrons. Since the number of protons and electrons are usually equal in an atom, we subtract those 2 lost electrons from the 20 protons to find that this Calcium ion has 18 electrons (e-). So, the correct answer is B. 20 pt, 26 nº, 18 e-

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A varied number of one or more kinds of atoms bonded together to form a large network is called a molecule.

What is molecule?

Molecules are the smallest particles of a substance that retain its chemical properties. They consist of two or more atoms of the same or different elements bonded together. Molecules can be simple, such as oxygen (O2) or water (H2O), or complex, such as proteins or DNA. They have specific chemical and physical properties, such as boiling point, melting point, and reactivity, that depend on their composition, structure, and intermolecular forces. The study of molecules and their interactions is fundamental to many fields, including chemistry, biology, and materials science.

However, if the number of atoms is extremely large and the bonds form a continuous network, the resulting substance is referred to as a macromolecule or a polymer. Examples of macromolecules include DNA, proteins, and plastics.

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The mass of one mole of propane is 44 grams.

The volume occupied by one mole of liquid propane within the tank is 0.0863 L

To calculate the volume occupied by one mole of liquid propane within the tank, we can use the ideal gas law given below:

where P is the pressure, V is the volume, n is the number of moles, R is the gas constant, and T is the temperature.

Volume of propane = mass / density

The density of liquid propane at room temperature and atmospheric pressure = 0.51 g/mL

The mass of one mole of propane is the molar mass of propane

Molar mass of propane = 44 g/mol

Volume of one mole of liquid propane = (44 / 0.51 g/mL)

Volume of one mole of liquid propane = 86.3 mL 0r 0.0863 L

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3.5 grams of calcium contains approximately 5.25 x 10^22 atoms.

The molar mass of calcium is 40.078 g/mol, which means that one mole of calcium contains Avogadro's number (6.022 x 10^23) of atoms.

To find out how many atoms are in 3.5 grams of calcium, we first need to convert the mass to moles using the molar mass:

3.5 g / 40.078 g/mol = 0.0873 mol

Next, we can use Avogadro's number to calculate the number of atoms:

0.0873 mol x 6.022 x 10^23 atoms/mol = 5.25 x 10^22 atoms

Therefore, 3.5 grams of calcium contains approximately 5.25 x 10^22 atoms.

A mole of calcium is 0.125 grams or 5 grams. In the example above, the element has a mass of 5 grams and a molar mass of 40g/mol.

Calcium has a molar mass of 40.08 g/mol. Calcium thus weighs 128.256 g. Hence, 3.2 moles of calcium have a mass of 128.256 g.

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Answer:

To solve this problem, we can use the ideal gas law and stoichiometry.

First, we need to convert the given temperature to Kelvin:

208.00 degrees Celsius + 273.15 = 481.15 K

Next, we can use the ideal gas law to find the volume of NH3 produced:

PV = nRT

P = 4.50 torr = 0.00592 atm (converting to atm)

V = unknown (what we are trying to find)

n = moles of NH3 produced = 26.00 moles N2 (from stoichiometry)

R = 0.0821 L·atm/K·mol (gas constant)

T = 481.15 K

Solving for V:

V = nRT/P

V = (26.00 mol)(0.0821 L·atm/K·mol)(481.15 K) / (0.00592 atm)

V = 3671.46 L

However, this is the volume of NH3 produced at standard temperature and pressure (STP), which is 0 degrees Celsius (273.15 K) and 1 atm. We need to convert this to the volume at the given temperature and pressure using the combined gas law:

(P1V1/T1) = (P2V2/T2)

P1 = 1 atm (STP pressure)

V1 = 3671.46 L (volume at STP)

T1 = 273.15 K (STP temperature)

P2 = 0.00592 atm (given pressure)

V2 = unknown (what we are trying to find)

T2 = 481.15 K (given temperature)

Solving for V2:

V2 = (P1V1T2) / (P2T1)

V2 = (1 atm)(3671.46 L)(481.15 K) / (0.00592 atm)(273.15 K)

V2 = 315491.48 L or 315491 L (rounded to two decimal places)

Therefore, 315491 L of NH3 will be produced at a temperature of 208.00 degrees Celsius and 4.50 torr pressure to consume 26.00 moles of N2.

Answer: Sodium chloride is the most soluble compound in water. Ammonium chloride is the least soluble salt and is almost completely insoluble in water. Lead chloride dissolves quite easily in water

Explanation: Mixing sodium chloride, ammonium chloride, and lead (ll) chloride can be separated into individual components using dialysis. Sodium ions are removed from the mixture due to their high affinity relative to chloride and ammonium ions.

No. of protons, neutrons, and electrons in this ion are 13, 14 and 13 respectively.

What are subatomic particles?

These particles make up atoms, and are often referred to as subatomic particles. There are three subatomic particles: protons, neutrons and electrons. Two of the subatomic particles have electrical charges: protons have a positive charge while electrons have a negative charge.

A = Mass number = no. of protons + no. of neutrons

Z = Atomic number = no. of electrons = no. of protons

Given, Al³⁺ ion that has A = 27 and Z = 13

Z = no. of electrons = no. of protons = 13

A - no. of protons = no. of neutrons = 14

Therefore, no. of protons, neutrons, and electrons in this ion are 13, 14 and 13 respectively.

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1,6,4 coefficients ensure that there are equal numbers of atoms of each element on both sides of the equation. So correct option is A.

A chemical equation is a symbolic representation of a chemical reaction, which shows the reactants, products, and their relative amounts. It is a shorthand way of describing a chemical reaction using chemical symbols and formulas.

A chemical equation consists of two sides, the reactant side and the product side, separated by an arrow, which represents the direction of the reaction. The reactant side lists the starting materials or reactants, while the product side lists the substances that are formed as a result of the reaction.

The balanced chemical equation for the reaction is:

P4O10 + 6 H2O → 4 H3PO4

The correct set of coefficients to balance the equation is:

A.  1,6,4

These coefficients ensure that there are equal numbers of atoms of each element on both sides of the equation.

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One way to determine whether a mixture is a solution or a mechanical mixture is to perform a filtration test. Another way to determine whether a mixture is a solution or a mechanical mixture is to perform a visual inspection test.

Explain about the above two tests in detail?

One way to determine whether a mixture is a solution or a mechanical mixture is to perform a filtration test. In this test, the mixture is passed through a filter paper, and if the filter paper traps solid particles, it indicates that the mixture is a mechanical mixture. On the other hand, if the mixture passes through the filter paper without leaving any solid particles, it suggests that the mixture is a solution.

Another way to determine whether a mixture is a solution or a mechanical mixture is to perform a visual inspection test. In this test, the mixture is observed under a microscope, and if the particles in the mixture are evenly distributed and do not settle over time, it indicates that the mixture is a solution. In contrast, if the particles in the mixture are not evenly distributed, and they settle over time, it suggests that the mixture is a mechanical mixture.

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Taking into account the reaction stoichiometry, 0.31375 moles of N₂O are formed upon the complete reaction of 25.1 g of ammonium nitrate.

In first place, the balanced reaction is:

NH₄NO₃  → N₂O + 2 H₂O

By reaction stoichiometry (that is, the relationship between the amount of reagents and products in a chemical reaction), the following amount of moles of each compound participate in the reaction:

The molar mass of the compounds is:

By reaction stoichiometry, the following mass quantities of each compound participate in the reaction:

The following rule of three can be applied: if by reaction stoichiometry 80 grams of NH₄NO₃ form 1 mole of N₂O, 25.1 grams of NH₄NO₃ form how many moles of N₂O?

moles of N₂O= (25.1 grams of NH₄NO₃ ×1 mole of N₂O) ÷80 grams of NH₄NO₃

moles of N₂O= 0.31375 moles

Finally, 0.31375 moles of N₂O are formed.

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There were 1.58 x 10^20 atoms of calcium left on the paper.

To determine the number of calcium atoms in CaCO3, we first need to know the molecular formula weight of CaCO3, which is 100.0869 g/mol.

Then, we can use this formula to calculate the number of moles of CaCO3:

moles of CaCO3 = mass of CaCO3 / molecular weight of CaCO3

mass of CaCO3 = (1.57 x 10^22 atoms) x (100.0869 g/mol / 6.022 x 10^23 atoms/mol) = 2.62 x 10^-2 g

Now we can calculate the number of moles of CaCO3:

moles of CaCO3 = 2.62 x 10^-2 g / 100.0869 g/mol = 2.62 x 10^-4 mol

number of calcium atoms = moles of CaCO3 x Avogadro's number

number of calcium atoms = 2.62 x 10^-4 mol x 6.022 x 10^23 atoms/mol = 1.58 x 10^20 atoms

Therefore, there were 1.58 x 10^20 atoms of calcium left on the paper.

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The concentration of the compounds if the gaseous decomposition of [tex]N_2O_5[/tex] was studied at 35°C is,

a) [tex]N_2O_5[/tex] after 12 minutes is 0.0104 mol/L.

b) [tex]NO_2[/tex] after 12.0 minutes is 0.0208 mol/L.

c) [tex]O_2[/tex] after 12.0 minutes is 0.0052 mol/L.

To solve this problem, we need to use the integrated rate law for a first-order reaction, which is:

ln[[tex]N_2O_5[/tex]] = -kt + ln[[tex]N_2O_5[/tex]]₀

PART A:

We are asked to find the concentration of [tex]N_2O_5[/tex] after 12.0 minutes, given that the initial concentration is 0.100 mol/L.

First, we need to find the value of the rate constant, k, using the given slope:

slope = -k = -9.8 x [tex]10^{-4} s^{-1}[/tex]

k = 9.8 x [tex]10^{-4} s^{-1}[/tex]

The integrated rate law may then be used to solve for ln[[tex]N_2O_5[/tex]] by including the values of k, t, and [[tex]N_2O_5[/tex]]:

ln[[tex]N_2O_5[/tex]] = -kt + ln[[tex]N_2O_5[/tex]]₀

ln[[tex]N_2O_5[/tex]] = -(9.8 x [tex]10^{-4} s^{-1}[/tex]) x (12.0 min x 1/60 s/min) + ln[0.100 mol/L]

ln[[tex]N_2O_5[/tex]] = -0.0066 + ln[0.100]

ln[[tex]N_2O_5[/tex]] = -4.714

Finally, we can exponentiate both sides of the equation to solve for [[tex]N_2O_5[/tex]]:

[[tex]N_2O_5[/tex]] = [tex]e^{(-4.714)}[/tex]

[[tex]N_2O_5[/tex]] = 0.0104 mol/L

Therefore, the concentration of [tex]N_2O_5[/tex] after 12.0 minutes is 0.0104 mol/L.

PART B:

We are asked to find the concentration of [tex]NO_2[/tex] after 12.0 minutes, given that the initial concentration of [tex]N_2O_5[/tex] is 0.100 mol/L.

We might derive from the synthetic condition that the molar proportion of [tex]NO_2[/tex] to [tex]N_2O_5[/tex] is either 4:1 or 2:1. In this way, 4 moles of [tex]NO_2[/tex] are made for every 2 moles of [tex]N_2O_5[/tex] that separate.

Since we know the concentration of [tex]N_2O_5[/tex] at 12.0 minutes from part (A), we can use the molar ratio to find the concentration of [tex]NO_2[/tex]:

[[tex]N_2O_5[/tex]] = 0.0104 mol/L

The molar ratio of [tex]NO_2[/tex] to [tex]N_2O_5[/tex] = 2:1

[[tex]NO_2[/tex]] = (2/1) x [[tex]N_2O_5[/tex]]

[[tex]NO_2[/tex]] = 2 x 0.0104 mol/L

[[tex]NO_2[/tex]] = 0.0208 mol/L

Therefore, the concentration of [tex]NO_2[/tex] after 12.0 minutes is 0.0208 mol/L.

PART C:

We are asked to find the concentration of [tex]O_2[/tex] after 12.0 minutes, given that the initial concentration of [tex]N_2O_5[/tex] 0.100 mol/L.

We may deduce from the chemical equation that [tex]O_2[/tex] and [tex]N_2O_5[/tex] have a molar ratio of 1:2. Therefore, 1 mole of [tex]O_2[/tex] is created for every 2 moles of [tex]N_2O_5[/tex] that breakdown.

Since we know the concentration of [tex]N_2O_5[/tex] at 12.0 minutes from part (A), we can use the molar ratio to find the concentration of [tex]O_2[/tex]:

[[tex]N_2O_5[/tex]] = 0.0104 mol/L

Molar ratio of [tex]O_2[/tex] to [tex]N_2O_5[/tex] = 1:2

[[tex]O_2[/tex]] = (1/2) x [[tex]N_2O_5[/tex]]

[[tex]O_2[/tex]] = 0.5 x 0.0104 mol/L

[[tex]O_2[/tex]] = 0.0052 mol/L

Therefore, the concentration of [tex]O_2[/tex] molecule after 12.0 minutes is 0.0052 mol/L.

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Answer:

Explanation:

not sure what 10# is

but you solve this way

(2.5 X 10 #) divide by (6.02 X 10^23)  X 28 g

6.02 x 10^23  is avogadros number use cause its in molecules

28 is the molar mass from the periodic table for CO

if I calculate it with 2.5 X 10 this is the answer  1.16 X 10^-21 g CO

Answer:

³⁹K₁₉⁺¹ or ³⁹₁₉K⁺¹

Explanation:

hope this helps

It is a redox reaction since the oxidation number of carbon was increased from zero to four and that of oxygen was decreased from zero to -2.

A redox reaction (short for reduction-oxidation reaction) is a type of chemical reaction in which there is a transfer of electrons between two chemical species. In a redox reaction, one reactant undergoes oxidation (loses electrons) while the other undergoes reduction (gains electrons).

Oxidation refers to the loss of electrons, while reduction refers to the gain of electrons. The substance that undergoes oxidation is called the reducing agent, as it causes the other reactant to be reduced.

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According to the solubility graph of KNO₃, 0.160 moles  would have to be added to 100 g of water to form a saturated solution at 10°C.

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.

At 40°C 67 g potassium nitrate is soluble thus at 10°C 10×67/40= 16.25 g is soluble which is 16.25/101.10= 0.160 moles.

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The expression for lowering of vapour pressure and molar mass of solute is given as -

                                                [tex]\frac{p^{0}- p }{p^{0} }[/tex] =  [tex]\frac{W_{2} }{M_{2} }[/tex] × [tex]\frac{M_{1} }{W_{1} }[/tex]

According to Raoult's law-

Relative lowering of vapour pressure of a non volatile solute is equal to the mole fraction of solute.

The relation between relative Lowering of vapour pressure and molar mass of solute is given as -

                                             [tex]\frac{p^{0}- p }{p^{0} }[/tex] = [tex]\frac{W_{2} }{M_{2} }[/tex] × [tex]\frac{M_{1} }{W_{1} }[/tex]

          where, [tex]p^{0}[/tex] = vapour pressure of pure solvent

                        p = vapour pressure of solution

                        [tex]W_{2}[/tex] = Mass of solvent

                       W₁ = mass of solute

                        M₂ = molar mass of solvent

                         M₁ = molar mass of solute.

                              Mole fraction of solute = [tex]\frac{n_{2} }{n_{1} + n_{2} }[/tex]

where, n₂ = number of moles of solvent

            n₁ = number of moles of solute

For dilute solution,  n₂ ∠∠n₁

Thus, n₂ can be neglected in the denominator and this gives,

                                                     [tex]\frac{p^{0}- p }{p^{0} }[/tex] = [tex]\frac{n_{2} }{n_{1} }[/tex]

We know that, number of moles = mass / molar mass.

Therefore replacing the values of  n₂ and n₁ with mass and molar mass gives-

                                                 [tex]\frac{p^{0}- p }{p^{0} }[/tex] = [tex]\frac{W_{2} }{M_{2} }[/tex] × [tex]\frac{M_{1} }{W_{1} }[/tex]

Therefore, this gives the relation between relative lowering of vapour pressure and molar mass of solute

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One of the subfields of chemistry called "organic chemistry" examines the composition, production, reactivity, and structure of molecules containing carbon.

A item is not necessarily healthful regardless of whether it claims to be organic or contains fresh products. Certain organic food could nevertheless be heavy in calories, fat, salt, or sugar. With running water, thoroughly clean and wash fresh fruits and vegetables.

Organic foods encourage an agricultural system which it avoids synthetic chemicals such as pesticides and fertilizers and encourages a more biologically diverse ecosystem, paying particular attention to the well-being of watersheds, soil, air, wildlife, agricultural labourers, and the climate. As a result, organic foods are unquestionably better for the environment.

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SN

1:1

So lf you multiply N with 4 you have to multiply the s with the same number

the answer Will be sS4N4

easy

11.5 grams of iron are formed, and aluminum sulfate is the other product of the reaction.

The balanced chemical equation for the reaction between aluminum and iron(II) sulfate is:

2Al(s) + 3FeSO4(aq) → Al2(SO4)3(aq) + 3Fe(s)

From the equation, we can see that 2 moles of aluminum react with 3 moles of iron(II) sulfate to produce 1 mole of aluminum sulfate and 3 moles of iron.

First, we need to calculate the number of moles of iron(II) sulfate in 42 g:

moles of FeSO4 = mass / molar mass = [tex]42 g / (55.85 g/mol + 2(32.06 g/mol) + 4(16.00 g/mol)) = 0.137 mol[/tex]

According to the balanced equation, we know that 3 moles of iron are produced for every 2 moles of aluminum, and we have excess aluminum in the reaction. Therefore, we can calculate the moles of iron produced based on the moles of iron(II) sulfate used:

moles of Fe = [tex]3/2 * moles \ of \ FeSO4 = 3/2 * 0.137 mol = 0.206 mol[/tex]

Now we can calculate the mass of iron produced:

mass of Fe = moles of Fe x molar mass of Fe = [tex]0.206 mol * 55.85 g/mol = 11.5 g[/tex]

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Answer:

C. Doughnut shape

Explanation:

Answer:

3.981 x 10⁻⁶

Explanation:

∵ pH = - log[H⁺]

∴ 5.4 = - log[H⁺]

∴ log[H⁺] = - 5.4

∴ [H⁺] = 3.981 x 10⁻⁶

Question:

Before tackling this problem, be sure you know how to find the antilog of a number using a scientific calculator.

A solution has a pH of 5.4. Write the formula you will use to calculate the [H+] and then show all your work leading to the determination of [H+].

ANSWER:

3.98*10^-6 mol dm-3

Explanation:

pH= -log[H+]

-pH=log[H+]

[H+]= antilog -pH

[H+]=10^-5*4

[H+]=3.98*10-6 mol dm^-3

Hope this helps :)

Density =mass/volume

=6/3

=2

The wavelength of the neutron is 4.65 n. Wavelength is typically measured in units of meters (m), centimeters (cm), or nanometers (nm).

What is Wavelength?

Wavelength is the distance between successive crests, troughs, or any other equivalent points in a wave. It is usually denoted by the Greek letter lambda (λ) and is commonly used to describe electromagnetic waves, such as light, as well as other types of waves, including sound and water waves.

Since the wavelength of a neutron is given by λ = h/p, where h is Planck's constant and p is the momentum of the neutron, we can calculate the wavelength using the equation λ = h/mv, where m is the mass of the neutron, v is its velocity, and h is Planck's constant.

First, we need to convert the velocity from m/s to cm/s, since the units of h are cm^2 g/s:

85.0 m/s × (100 cm/1 m) = 8500 cm/s

Next, we can plug in the values for m, v, and h:

λ = h/mv = (6.626 × 10^-27 cm^2 g/s)/(1.67493 × 10^-24 g × 8500 cm/s)

λ = 4.65 nm

Therefore, the wavelength of the neutron is 4.65 nm.

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The elements or compounds that take part in a chemical reaction are called reactants, and the resulting compounds are the products.

Reactants are the compounds or elements that take part in a chemical reaction and the compounds that are formed later are called the products. The mass of the reactants is equal to the mass of the products obtained in a chemical reaction as per the law of conservation of mass.

There are various laws for masses of reactants and products in a chemical reaction. One of these is the law of conservation of mass, which stipulates that the total mass of the reactants and products in a chemical process must equal one another. In other words, mass is always conserved throughout chemical reactions and cannot be created or removed.

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The addition of iodide ion (I-) to a solution of silver nitrate (AgNO3) forms a black precipitate of silver iodide (AgI) and nitric acid (HNO3) is formed as a byproduct.

The pink color observed with petroleum ether is due to the formation of AgI complexes with organic compounds present in the petroleum ether. The balanced chemical equation for this reaction is as regards:

2 AgNO₃ + 2 KI → 2 AgI (s) + 2 KNO₃

This equation shows that two moles of silver nitrate (AgNO₃) react with two moles of potassium iodide (KI) to form two moles of silver iodide (AgI) precipitate and two moles of potassium nitrate (KNO₃) in solution.

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D. The slightly positive hydrogen on one water molecule is attracted to a slightly negative oxygen on another water molecule.

Hydrogen bonding is a type of intermolecular force that occurs between a slightly positive hydrogen atom in one molecule and a slightly negative atom, typically oxygen or nitrogen, in another molecule.

In water molecules, the oxygen atom is more electronegative than the hydrogen atoms, which gives the oxygen a partial negative charge and the hydrogen atoms a partial positive charge. This results in the slightly positive hydrogen atom being attracted to the slightly negative oxygen atom in a neighboring water molecule, forming a hydrogen bond.

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Answer:

number of moles in 79.91g of beryllium chloride = 1.000 moles

What is a mole?

The mole (symbol - mol) is a unit of amount of substance in the International System of Units (SI). The mole is defined as containing 6.02214076×10²³ elementary entities. These may be atoms, ions, molecules, etc. The mole is used to simplify quantitative calculations of chemistry.

To calculate number of moles, divide the mass of substance present by the molar mass of substance. The molar mass is the mass in grams of one mole of the substance, and can be calculated by summing the molar masses of the element components of the substance.

Molar mass can be located on a standard IUPAC Periodic Table (International Union of Pure and Applied Science).

Hence, n(BeCl₂) = m÷M = 79.91÷(9.012 + 2×35.45) = 1.000 moles