What would be the number of phosphorus atoms in a 2.34 g sample of calcium phosphate?



(My answer was 9.1*10^21 but I'm not sure if I went wrong somewhere in the process)

The standard molar enthalpy of formation for sodium hydroxide is -55 kJ/mol.

The standard molar enthalpy of formation for a substance is the amount of energy required to form one mole of that substance from its component elements in their standard states.

In this case, the reaction given is 2 NaOCl(aq)+NH3(aq)⇆ NHCl2(aq)+2 NaOH(aq) with an overall enthalpy change of -470 kJ/mol. According to Hess's Law, the overall enthalpy change is equal to the sum of the enthalpy changes of each component.

In this case, we need to change the sign of the reactants as they are consumed, not formed, and thus will have a positive value. Therefore, the enthalpies of formation for ammonia and bleach are +350 kJ/mol and +45 kJ/mol respectively.

When adding these values and the enthalpy of formation of NHCl2(aq) which is 140 kJ/mol and using x as the value for the enthalpy of formation of NaOH(aq) we can find that x=-55 kJ/mol.

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The percentage yield is 79.4%. This means that 79.4% of the expected amount of C3H8 was collected from the reaction.

Percentage yield is a measure of the efficiency of a chemical reaction. It is calculated by dividing the actual yield of a product by the theoretical yield, and then multiplying that number by 100. The theoretical yield is the amount of product that would be produced if the reaction went to completion. The actual yield is the amount of product actually obtained in a reaction.

This can be calculated by taking the actual yield of 125.4 g C3H8 and dividing it by the expected yield of 158.4 g C3H8 and multiplying it by 100.
(125.4 g C3H8 ÷ 158.4 g C3H8) × 100 = 79.4%

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The chemical symbol for the element Ti for the given ground state electron configuration. [Ar]4s² 3d²

Electron arrangements around an atom's nucleus are known as electron configurations. As an illustration, lithium's electron configuration, 1s²2s₁, indicates that the metal has two electrons in the 1s subshell and one electron in the 2s subshell.

The shell number (n) is the first symbol used to represent an electron configuration, followed by the type of orbital and the superscript number of electrons in the orbital. Consider this: The periodic table shows that oxygen has eight electrons.

chemical symbol: Ti

name: titanium

4s²:

n = 4

l = 0

ml= 0

3d²:

n = 3

l = 2

ml= -2,-1,0,+1,+2

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Among the given elements, S and Sr forms ionic compound. Sr metal donate electron to sulfur forming ionic compound.

Ionic compounds are formed between metals and non metals. The metals are electropositive elements. They easily loss electrons in chemical bonding.

Strontium is an alkaline earth metal with two valence electrons. Strontium forms ionic compounds with non-metals by donating its two valence electrons.

Sulfur needs two more electrons to achieve octet. Hence, it easily gain two electrons from strontium metal forming the ionic compound SrS.

Hence, option c is correct.

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1- Shipper's package in order to protect the material. 2- Drivers placard their vehicles to indicate the risk. 3- To decide which placards (if any) you need, you need to know: The particular hazardous material being transported, The quantity of the hazardous material being transported.

The classification of the hazardous material being transported (UN number)The United Nations (UN) number identifies a specific hazardous material and is used to classify and identify materials for transportation. The UN number is used to determine the appropriate placarding for a vehicle transporting hazardous materials. It should be noted that the UN number, the quantity and the classification are used to determine the proper labeling, packaging, and documentation required for transportation of hazardous materials.

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The free energy change for the reaction at 35 ∘C is -1157.45 KJ

Gibbs free energy also termed as the Gibbs energy as well as free enthalpy, or Gibbs function is a quantity which is also used to measure the maximum amount of work done in thermodynamic system when the pressure and temperature are kept constant.

Formula of Gibb's free energy is as follows:

ΔG = ΔH -TΔS

ΔH =1269.8 kJ

ΔS= -364.6 J/K

T = 35ºC = 308.15

ΔS = x 0.001 = 0.3646

ΔG = 1269.8 kJ -(308.15x-0.3646)

ΔG = -1157.45 kJ

Therefore, it is a spontaneous process.

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Depending on the difference in electronegativity between the participating atoms, covalent bonds can either be polar or nonpolar.

The correct option C

The electronegativity of an atom describes its propensity to attract protons or electron density in that direction. It regulates the shared electron distribution between a number of atoms in a bond. The stronger the attraction of the electrons in an atom's bonds, the more electronegativity it possesses.

The strength with which an element draws the shared electrons depends on the value of its electronegativity.

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[tex]C_{6} H_{6}[/tex] will be the molecular formula of the given chemical substance. The simplest whole-number ratio of the atoms in a compound is shown by empirical formulae.

the number of each type of atom in a molecule is shown by molecular formulas, and the bonds between the atoms in a molecule are shown by structural formulas.

Empirical Formula Mass = (12.01 + 1.008) u

Empirical Formula Mass = 13.018 u

Molecular formula = (Empirical Formula)ₙ

n = Molecular formula Mass/Empirical Formula Mass  

n = 78.11 u/13.02 u  

n = 6

Molecular formula = (CH)₆

Molecular formula = C₆H₆

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When HNO2 is added, concentration of HNO2 rises and the equilibrium is shifted to the left, where it favours NO2 ions and depletes OH ions.

It is a static or dynamic state of equilibrium between two opposing forces or actions. The extent of a reaction, or the level of the vanishing of the reactants, can be predicted using the equilibrium constant (Kc). A general sense of the relative amounts of the reactants and products can be obtained from the equilibrium constant's magnitude.

The equilibrium's equation is:

NO2- (aq.) + H2O (l) ⇌ HNO2 (aq.) + OH− (aq.)

Le Chatelier's Principle will be applied to ascertain how the addition of the specified chemicals would affect the equilibrium mixture.

The equilibrium is shifted to the left by the addition of HNO2, which raises the concentration of HNO2.

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Answer: infinitely many solutions

Explanation: since this equation is the same on both sides, any value that is plugged in for "u" will equal the same amount on both sides.

example) -8 + 3(1) = 3(1) - 8

-8 +3 = 3 + -8

-5 = -5

882 kJ/mol of energy will be needed to break the necessary bonds in the formation of two moles of water.

Energy is described as the quantitative property that is transferred to a body or to a physical system, recognizable in the performance of work and in the form of heat and light.

The bond energy of H-H is 436 kJ/mol

The bond energy of O=O is 495 kJ/mol

The bond energy of H-O is 463 kJ/mol

In order to calculate the total energy needed to break the bonds in the reactants, we add up the bond energy of each bond broken.

For 2 moles of H2 we need 22436 = 1744 kJ/mol

For O2 we need 2*495 = 990 kJ/mol

In total, we need 1744 kJ/mol + 990 kJ/mol = 2734 kJ/mol

we will then add up the bond energy of each bond formed.

For 2 moles of H2O we need 22463 = 1852 kJ/mol

Therefore, the energy needed to break the necessary bonds in the formation of two moles of water is 2734 kJ/mol - 1852 kJ/mol =

882 kJ/mol

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An ether is methoxybutane. Alkoxy alkanes are the term for ethers. The alkoxy group includes the lower alkyl group. There are two alkyl groups in methylbutane. methyl

The C-H bonds in CH3CH2CH3 have a relatively modest dipole moment and weak dipole-dipole forces because hydrogen and carbon have very similar electronegativities.

In water, CH3NH3Cl + HCl will entirely dissociate to form 2 mol L-1 ions. Or less 1 mol L-1 of ions will only be partially produced by CH3NH2's reaction with water. written last: CH3NH2.

Sequence of acidity: CH3SH > (CH3)2PH > HCl (strongest acid) (weakest acid). In contrast to the conjugate acid of the amide, the nucleophile of CH3CH2NH2 (ethylamine) does indeed have a single resonance contributor.

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Answer: yes the atomic number goes on top of the symbol or does the mass number go on top

Explanation: yes the atomic number goes on top of the symbol or does the mass number go on top

Answer:

Aluminum hydroxide (Al(OH)3) has several advantages over sodium bicarbonate (NaHCO3) as an antacid. One advantage is that Al(OH)3 does not neutralize stomach acid as quickly as NaHCO3 does, so it can provide longer-lasting relief for symptoms of heartburn and indigestion. Additionally, Al(OH)3 is less likely to cause side effects such as diarrhea, which can be a common problem with overuse of NaHCO3. Furthermore, Al(OH)3 can also adsorb excess stomach acid and form a physical barrier that helps to protect the stomach lining.

Option C: silicon (Si) and germanium (Ge) is he pair of elements that has atoms with the same number of valance electrons.

Atoms that belong to the same periodic table group will share the same number of valence electrons. Therefore, the valence electrons of Cl, and I of group 17, Na, and Ca of group 1, and C, Si, and Ge of group 14 are the same. The outermost level contains valence electrons, which are crucial in chemical bonding. Thus, option C is the right choice.

The number of valence electrons shared by elements in the same column or group of the periodic table is called the valence electron number. For instance, group 1's alkali metals all have a single valence electron. This indicates that sodium and lithium both have the same number of valence electrons. In the study of chemistry, valence, often known as valency, is the characteristic of an element that determines how many other atoms it may combine with.

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Complete question is:

Which pair of elements has atoms with the same number of valence electrons ?

a. indium (In) and lead (Pb)

b. potassium (K) and bromine (Br)

c. silicon (Si) and germanium (Ge)

d. astatine (At) and radon (Rn)

Answer:

pH= 8.30

Explanation:

The pH of the solution with a [H+] concentration of 5x10-9 ml/dm^3 is 8.30. This can be calculated using the pH to H⁺ formula: pH=−log([H+]). Substituting the given [H+] concentration, we get: pH = −log(5x10-9) = 8.30.

Peridotite is the most likely answer.

Peridotite is a type of igneous rock composed primarily of the minerals olivine and pyroxene. It is the most common rock in the upper mantle of the Earth, and is usually found in regions known as subduction zones where tectonic plates are colliding. Peridotite is formed from the partial melting of mantle rocks, and contains high amounts of magnesium and iron. This type of rock is often mined for gemstones, as well as for its use in construction and jewelry-making.

Peridotite is a type of ultramafic rock made of olivine, pyroxene, and amphibole minerals. It is composed mostly of minerals with a hardness of 6.5 and has a greenish hue, making it consistent with the description given. Furthermore, peridotite is known to fracture, but not cleave, making it the most likely answer given the characteristics of the rock.

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According to the provided statement, the mystery gas has a molar mass of 118.1 g/mol.

Numerous processes and products are refined and made using hydrogen chloride, including scrubbing, pickling, depositing metals, curing leather, and sanitising. Burning various plastics can result in the formation of hydrogen chloride. In the presence of water, it produces hydrochloric acid.

Graham's Rule of Emfluence

According to Graham's law of effusion, a gas's effusion rate is inversely related to the square root of its particle mass. You may write this formula as follows:

[tex]\frac{\text { Rate }_1}{\text { Rate }_2}=\sqrt{\frac{\mathrm{M}_2}{\mathrm{M}_1}}[/tex]

Rate1 is the first gas's effusion rate.

The second gas's effusion rate is represented by Rate2.

The average concentration of gas is M1, The mole ratio of gas is 1 M2. 2.

Gases like hydrogen chloride (HCI) diffuse 1.8 times more quickly than unidentified gases.

The molar volume of halogens (HCI) is known to be 36.46 g/mol.

Unknown gas has a molar mass of =?

In the formula, let's enter the following values:

[tex]\frac{\text { Rate }_{\mathrm{H}_2}}{\text { Rate }_{\text {unknown }}}=\sqrt{\frac{\mathrm{M}_{\text {unknown }}}{\mathrm{M}_{\mathrm{H}_2}}} 1.8=\sqrt{\frac{\mathrm{M}_{\text {unknown }}}{36.46}}(1.8)^2=\frac{\mathrm{M}_{\text {unknown }}}{36.46} \mathrm{M}_{\text {unknown }}=36.46 \times(1.8)^2 \mathrm{M}_{\text {unknown }}=118.1304 \mathbf{M}_{\text {unknown }}=\mathbf{1 1 8 . 1}[/tex]

The unknown gas has a molar mass of 118.1 g/mol.

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The molar mass of hydrate part present in the sample of calcium sulfate is 0.962 g.

Molar mass of a compound or a molecule is defined as the mass of the elements which are present in it.The molar mass is considered to be a bulk quantity not a molecular quantity. It is often an average of the of the masses at many instances.

The molecular mass and formula mass are used as synonym for the molar mass.It does not depend on the amount of substance which is present in the sample.It has units of gram/mole.

Value of mass of water= mass of calcium sulfate-mass of anhydrous form=2.00-1.038=0.962 g.

Thus, The molar mass of hydrate part present in the sample of calcium sulfate is 0.962 g.

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Curium (Cm) and Rhenium are the two elements with female names (Re).

After Marie Curie, a pioneering researcher in the realm of radioactivity, the element curium, with atomic number 96, was named. She was the first person to receive two Nobel Prizes, one each in physics and chemistry, and her work on the discovery of radium and polonium contributed to the advancement of X-ray technology and the development of cancer therapies.

Rhenium, an element with the atomic number 75, was given its name in honour of Ida Tacke-Rhenium, a German scientist who made the discovery of the substance alongside her husband in 1925. The element was found and isolated by her, and it has since been widely employed in high-temperature alloys, catalysts, and electronic parts.

Both of these women made significant contributions to science, and the naming of these elements pays tribute to them. They were pioneers in a male-dominated industry, and their contributions have had a lasting influence on science and technology.

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In order for 0.10 mol of crystalline magnesium hydroxide to completely react, 100 mL volume, in milliliter, of 2.00 mol hydrobromic acidity is needed.

Magnesium hydroxide is just a short-term medication for adults and children who experience sporadic constipation. Saline laxatives are a group of drugs that include magnesium.

Magnesium hydroxide increases gastrointestinal water and lowers stomach acid, which may promote bowel movements. A reliever used to address sporadic nausea is potassium hydroxide. Additionally employed as a neutral to relieve stomach pain, vomiting, and discomfort is potassium hydroxide.

2.00 mol H × = 100 mL

= 1.00 L

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the equilibrium constant (Kc) for the reaction at 25 ∘C is e^(-5764.68/(8.314*298.15))

The equilibrium constant (Kc) for a reaction can be calculated using the standard Gibbs free energy of the reaction (ΔG°) at a given temperature. The Gibbs free energy for a reaction can be calculated using the standard electrode potentials (Eo) of the reduction

half-reactions involved in the reaction as: ΔG° = -nFΔE°

For the reaction : MnO2(s) + 4H+(aq) + Cu(s) → Mn2+(aq) + 2H2O(l) + Cu2+(aq)

The standard electrode potentials for the reduction half-reactions are:

MnO2(s) + 4H+(aq) + 2e- → Mn2+(aq) + 2H2O(l) Eo = 1.21 V

Cu2+(aq) + 2e- → Cu(s) Eo = 0.16 V

The change in standard electrode potential for the reaction is the sum of the electrode potentials for the half-reactions is :

ΔE° = Eo(Mn2+/MnO2) + Eo(Cu/Cu2+) = 1.21 V + 0.16 V = 1.37 VThe standard Gibbs free energy for the reaction is

ΔG° = -nFΔE° = -4 * 96485 * 1.37 = -5764.68 J/mol

The equilibrium constant (Kc) for the reaction at 25 ∘C can be calculated using Kc = e^(-ΔG°/RT) where R is the gas constant (8.314 J/mol·K) and T is the temperature in Kelvin (298.15 K).So the equilibrium constant (Kc) for the reaction at 25 ∘C is e^(-5764.68/(8.314*298.15))

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Multivalent elements are metals that can form more than one stable ion charge. Polyatomic ions are ions that consist of more than one atom.

The primary distinction between a multivalent element and a polyatomic ion is that multivalent elements have several valencies, whereas polyatomic ions contain multiple atoms that are covalently bound to each other. The prefix "multi-" means "many".

The normal ion has only one element, chlorine. The polyatomic ion contains two elements: chlorine and oxygen.

Therefore, metals that can create more than one stable ion charge are known as multivalent elements. Polyatomic ions are ions with more than one atom.

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The surface of the sun has a temperature of about 5800K and consists largely of hydrogen atoms. The rms speed of a hydrogen atom at this temperature is 11991 m/s

Given that :

Temperature = 5800 K

The rms speed expression is given as :

Vrms = √3KT / m

mass , m = 1.67 × 10⁻²⁷

The rms speed is given as :

Vrms = √ 3 × 1.38 × 10⁻²³ × 5800 / 1.67 × 10⁻²⁷

Vrms = 11991 m/s

Thus, the rms speed at temperature  of the 5800 K and it consist the largely of the hydrogen atom is 11991 m/s.

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Political action committees that promote candidates for public office are created by numerous interest groups.

A community within a larger organisation that shares the objective of developing a certain area of learning, expertise, or technology is known as a special interest group. Members may communicate, physically meet, and organise conferences as they collaborate to influence or create solutions in their specialised fields. Three basic functions are provided by interest groups: member assistance, policy creation, and advocacy. Political parties focus on a broader variety of issues and work to win elections; interest groups, in contrast, have a more focused agenda and don't participate in politics. Political action committees that promote candidates for public office are created by numerous interest groups.

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Answer: The maximum resultant force: 12 N

               The minimum resultant force: 2 N

Explanation: A force is actually a vector. And if there is no angle among these two forces (or let's say "vectors"), this is the maximum situation (not a general rule, but it is valid for this question because both vectors are positive) and we add these forces up for the solution. So, the magnitude of this resultant force would be 12 N.

Drawing one force vector which has 12 N magnitude and acts on the object would be enough for the solution.

However, the angle among them should be 180 degrees so that the minimum situation exists. So, we are actually subtracting these two forces instead of adding them here.

This means that drawing one force vector which has 2 N magnitude would be enough for the other solution.

5 moles of water will be obtained from the reaction on complete consumption of one gas.

The balanced equation for the reaction between hydrogen and oxygen to form water is:

2H2 + O2 -> 2H2O

From the given information, we know that 10 moles of hydrogen are allowed to react with 6 moles of oxygen.

In order to determine the amount of water that will be formed, we can use the stoichiometry of the reaction to calculate the number of moles of water that will be produced.

Since the coefficients in the balanced equation are the same for hydrogen and oxygen, we can use the number of moles of either gas to calculate the number of moles of water that will be formed.

In this case, we have 10 moles of hydrogen and 6 moles of oxygen.

From the balanced equation, 2 moles of H2 react with 1 mole of O2 to form 2 moles of H2O. So, 10 moles of H2 / 2 moles H2 per mole H2O = 5 moles of H2O will be formed.

So, 5 moles of water will be obtained from the reaction on complete consumption of one gas.

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Answer:

0.87 moles of sodium acetate is equal to 5.22 formula units of sodium acetate. This is calculated by multiplying the number of moles (0.87) by the number of formula units (6) per mole

Explanation:

An aluminium ion looses two electron to form a negative ion.

The formula of carbonate is Co₃⁻².

The term ion is define as any atom or group of atoms that have one or more positive or negative electrical charges. There are two types ion cation and anion.

One lithium atom is react with two fluorine atom to formed lithium fluoride.

Ionic bonds are stronger than covalent bond.

The charge on the barium ion is +2.

When gas turns into liquid its particle get smaller.

Lithium fluoride is a mixture because it contains more than two element.

In an atom the number of electron is equal to the number of proton.

The complete shell contains eight electrons in it.

In the periodic table, elements in the same group does not have the same electron in their outermost shell.

Thus, An aluminium ion looses two electron to form a negative ion.

The formula of carbonate is Co₃⁻².

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