1) ¿Cuántos gramos están contenidos en 4 moles de Oro puro Au?

Answer:

P4 + 3O2 --> 2P203

Explanation:

P4 + 3O2 --> 2P203 is the balanced equation

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Explanation:

Sometimes, a solution contains more dissolved solute than is normally possible. This type of solution is said to be supersaturated. A saturated solution can become supersaturated if more solute is added while the temperature is raised.

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Answer:He2 & O2

Explanation:

Answer:

Answer:A

Explanation:

Answer:

1.52M in NaCl

Explanation:

Molarity = moles solute / volume solution in Liters

=> molarity (M) = 3.8 moles / 2.5 Liters solution = 1.52 molar solution in NaCl

Answer: 1.52

Explanation:

The gravimetric factor for Br- using silver bromide is 0.425.

The gravimetric factor is an expression that is used to convert grams of a compound into grams of a single element.

It is expressed as a ratio of the formula weight (FW) of the substance that is being determined to that of a second substance that is weighed.

For example formula of silver bromide is AgBr and the formula mass of silver bromide is 188 g/mol

Formula mass of bromide ion = 80 g/mol

Gravimetric factor = 80/1188

Gravimetric factor = 0.425

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Answer:

pH of the buffer is 3.75

Explanation:

It is possible to find pH of a buffer using Hendersson-Hasselbalch equation:

pH = pKa + log [A⁻] / [HA]

Where [A⁻] is molar concentration of the conjugate base and [HA] concentration of the weak acid

In the lactic buffer, pKa = 3.86. Lactic acid is the weak acid and its conjugate base is tha lactate salt. H-H equation for this buffer is:

pH = 3.86 + log [Lactate] / [Lactic acid]

Replacing with the concentrations of the problem:

pH = 3.86 + log [0.10M] / [0.13M]

pH = 3.75

Answer:

A type of an atom which has a different number of neutrons but the same atomic number, therefore making it the same element. This atom would still have the same properties as well. (Ex: Vanadium-51 is an isotope of Vanadium that has 51 neutrons but still has 23 protons, as its atomic number is 23.)

Isotopes are variants of an element that have the same number of protons in their atomic nucleus, identifying them as the same chemical element, but differ in the number of neutrons.

The variations in neutron numbers among isotopes lead to differences in their atomic masses, resulting in isotopes having slightly different physical properties while retaining similar chemical behavior.

For example, in the case of boron, the two isotopes listed may have the same number of protons (5), but one has 6 neutrons, and the other has 7 neutrons, leading to slightly different atomic masses.

Similarly, for carbon and oxygen, the isotopes exhibit variations in neutron numbers while maintaining the same number of protons, defining them as isotopes of the respective elements. Isotopes play a crucial role in various scientific fields, including radiometric dating, nuclear energy, and medical imaging.

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Answer:

Hope this helps ;) don't forget to rate this answer !

Explanation:

To find the number of moles of Cr(NO3)3 in the sample, we need to determine the number of moles of each element present in the compound.

The chemical formula for Cr(NO3)3 tells us that for every 1 mole of Cr(NO3)3, there is 1 mole of chromium (Cr), 3 moles of nitrogen (N), and 9 moles of oxygen (O).

We are given that the sample contains 8.36 moles of oxygen. Since the ratio of oxygen to Cr(NO3)3 is 9:1, the number of moles of Cr(NO3)3 in the sample is 8.36 moles O / 9 moles O/mole Cr(NO3)3 = 0.93 moles Cr(NO3)3.

Rounded to 3 significant figures, the answer is 0.93 moles Cr(NO3)3.

Answer:

3.11 mol/kg

Explanation:

Molality M = number of moles of solute, n/mass of solvent, m

To calculate the number of moles of glycerol (C₃H₈O₃) in 22.75 g of glycerol, we find its molar (molecular) mass, M',

So, M' = 3 × atomic mass of carbon + 8 × atomic mass hydrogen + 3 × atomic mass of oxygen

= 3 × 12 g/mol + 8 × 1 g/mol + 3 × 16 g/mol = 36 g/mol + 8 g/mol + 48 g/mol = 92 g/mol.

So, number of moles of glycerol, n = m'/M' where m' = mass of glycerol = 22.75 g and M' = molecular mass of glycerol = 92 g/mol

So, n = m'/M'

n = 22.75 g/92 g/mol

n = 0.247 mol

So, the molality of the solution M = n/m

Since m = mass of ethanol = 79.6 g = 0.0796 kg, substituting the value of n into the equation, we have

M = 0.247 mol/0.0796 kg

M = 3.11 mol/kg

So, the molality of the solution is 3.11 mol/kg.

we would need 2625.13 grams (or 2.62513 kilograms) of NaCl.

To calculate the mass of NaCl required to produce a 26.4 mol/L solution with a 1.7 L volume, we need to use the formula that relates the mass of solute, moles of solute, and molarity:Molarity (M) = moles of solute / liters of solution Rearranging this formula, we get:moles of solute = Molarity (M) x liters of solutionWe can use this formula to find the moles of NaCl needed:moles of NaCl = 26.4 mol/L x 1.7 L = 44.88 molNow, we can use the molar mass of NaCl to convert from moles to grams. The molar mass of NaCl is 58.44 g/mol:mass of NaCl = moles of NaCl x molar mass of NaClmass of NaCl = 44.88 mol x 58.44 g/mol = 2625.13 gTo produce a 26.4 mol/L solution with a 1.7 L volume.

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The 1930s saw natural disasters as well as manmade ones: For most of the decade, people in the Plains states suffered through the worst drought in American history, as well as hundreds of severe dust storms, or "black blizzards," that carried away the soil and made it all but impossible to plant crops.

Explanation:

When a chlorine atom forms an ion, it gains electrons, making it negative.  A neutral chlorine will become a chlorine with a -1 charge.  When it gains an electron, the radius increases.

When a sodium atom forms an ion, it loses electrons, making it positive.  A neutral sodium will become a sodium with a +1 charge.  When it loses an electron, the radius decreases.

The hybridization of benzene is sp² hybridizes the benzene is combination of carbon and hydrogen . the steric number of benzene of central atom carbon is 3.

The formula for the count of steric number is given as :

steric number = number of the lone pairs on the central metal atom + the number of atom bonded with the central atom. The benzene contain the 6 carbon atom an the 6 hydrogen atom. the central atom here is carbon.  the benzene have 12 sigma bonds and 3 pi bond mean double bond. The total number of covalent bond is 15.

Thus, The hybridization of benzene is sp² hybridizes the benzene is combination of carbon and hydrogen . the steric number of benzene of central atom carbon is 3.

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NaCl, KOH, C5H5, C6H24, KNO3, Na2SO4, CH2CH2OH are highly soluble in water and CHCl3, CH2OH, CCl4, CH2Cl2, CH3COOH, and CH3(CH2)5OH are either slightly soluble or insoluble in water.

The solubility of a compound in water refers to the ability of that compound to dissolve in water. Compounds that are highly soluble in water can easily dissolve in water, while those that are slightly soluble or insoluble cannot dissolve or dissolve only to a limited extent.

The solubility of a compound in water depends on several factors, including the chemical structure of the compound, the temperature and pressure of the solvent, and the presence of other solutes in the solvent.

Some common examples of highly soluble compounds in water include ionic compounds such as sodium chloride and potassium hydroxide, while nonpolar compounds such as chloroform and carbon tetrachloride are generally insoluble in water.

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1.0 mole of H2 will react with 0.33 moles of N2.

The balanced chemical equation for the reaction between H2 and N2 is:

N2 + 3H2 → 2NH3

From the equation, we can see that 1 mole of N2 reacts with 3 moles of H2 to produce 2 moles of NH3. Therefore, if we have 1.0 mole of N2, we need 3.0 moles of H2 to react completely.

If we are given 1.0 mole of H2, we can calculate the amount of N2 it will react with by using the stoichiometry of the equation:

1.0 mole H2 × (1 mole N2/3 moles H2) = 0.33 moles N2

Therefore, 1.0 mole of H2 will react with 0.33 moles of N2.

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The correct dose for a 175 lb patient would be approximately 0.48602 grams.

To convert 6.13 mg/kg to grams, we need to consider the weight of the patient and perform a unit conversion. Here's the step-by-step process:

1. Convert the weight of the patient from pounds to kilograms.

  175 lb * (1 kg / 2.205 lb) = 79.37 kg (rounded to two decimal places)

2. Calculate the correct dose in grams by multiplying the patient's weight by the given dosage.

  79.37 kg * 6.13 mg/kg = 486.02 mg

3. Convert the dose from milligrams (mg) to grams (g) by dividing by 1000.

  486.02 mg / 1000 = 0.48602 g (rounded to five decimal places)

Therefore, the correct dose for a 175 lb patient would be approximately 0.48602 grams.

It's important to note that this calculation assumes the dosage is based on body weight and that the given dosage is appropriate for the patient's condition. Always consult a healthcare professional or follow the instructions of a medical prescription for accurate dosing information.

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Answer:

the answer is a

Explanation:

an electron contains a negative charge and like charges repel each other. Hence, in a atom the force of repulsion between the atoms away from each other. As a result a molecules atoms are as far away from each others as they can get .

A molecule's atoms as far away from each other as they can get because "Forces between electron pairs push the atoms apart".

So, option C is correct one.

Since, an electron is negative charge species revolve around the nucleus of an atom. So, when two atoms come close to each other in molecules there is repulsion occurs between negative charge electron .

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sorry but I don't know so sorry

The enthalpy (in kJ/mol) of the reaction, given that 0.026 moles of H₂O₂ at 25.0 °C is placed in a coffee cup calorimeter is 95.98 KJ/mol

First, we shall determine the heat energy of the reaction. Details below:

Q = MCΔT

Q = 30 × 4.18 × 19.9

Q = 2495.46 J

Finally, we shall determine the enthalpy of the reaction. Details below:

Q = n × ΔH

2.49546 = 0.026 × ΔH

Divide both sides by 0.026

ΔH = 2.49546 / 0.026

ΔH = 95.98 KJ/mol

Thus, the enthalpy of reaction is 95.98 KJ/mol

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Gravity causes spacecraft such as stars, planets, moons, and other bodies to orbit one another. Revolution describes this style of movement.

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Question:

What occurs to the atoms of reactants in a chemical reaction?

Answer:

In a chemical reaction, the atoms and molecules that interact with each other are called reactants. ... No new atoms are created, and no atoms are destroyed. In a chemical reaction, reactants contact each other, bonds between atoms in the reactants are broken, and atoms rearrange and form new bonds to make the products.

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Answer:

=> Fire is a rapid oxidation of any substance or material. It is a exothermic chemical process of combustion.

=> Flame is a visible, gaseous region of a fire.

Increasing the temperature increases the rate of reaction

The velocity of the particles present in a system simply intensifies with the rise in temperature.

This thermal energy increases their kinetic energy or intense motion, resulting in forceful, frequent collisions between reactant molecules that lead to an upsurge of triumphed ones and subsequently escalate the reaction rate.

Regarding option A, one should note that pressure is unrelated to temperature since they stand as independent variables throughout this reaction. Going for option B, flammability of the reactants isn't susceptible to alterations upon raising the temperature thus making it an unacceptable statement. Lastly, carbon dioxide does not possess heat-trapping properties rather its content solely contributes to diffusing into the overall surroundings.

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At equilibrium, the number of moles of Cl2(g) present is approximately 347.37 mol.

To determine the number of moles of Cl2(g) at equilibrium, we need to use the given equilibrium constant (Kc) and set up an ICE table to track the changes in the reactants and products.

The balanced equation for the reaction is:

CO(g) + Cl2(g) ⇌ COCl2(g)

Let's set up the ICE table:

  CO(g)     +     Cl2(g)     ⇌     COCl2(g)

Initial: 0.3500 0.05500 0

Change: -x -x +x

Equilibrium: 0.3500 - x 0.05500 - x x

Using the equilibrium concentrations in the ICE table, we can write the expression for the equilibrium constant (Kc) as:

Kc = [COCl2(g)] / [CO(g)][Cl2(g)]

Substituting the values into the equation, we have:

1.2 × 10^3 = (0.05500 - x) / [(0.3500 - x)(0.05500 - x)]

Simplifying the equation, we can cross-multiply and rearrange:

1.2 × 10^3 × (0.3500 - x)(0.05500 - x) = 0.05500 - x

Expanding and rearranging, we get:

0 = (1.2 × 10^3 × 0.05500 - 1.2 × 10^3x + 0.05500x) - x

Simplifying further:

0 = 66 - 1.245x + 0.05500x - x

0 = 66 - 0.19x

0.19x = 66

x = 66 / 0.19

x ≈ 347.37

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The equation C2H4(g) + H2(g) + C2H6(g) → Caco3(s) + Cao(s) + CO2(g) shows an increase in entropy due to the formation of a gas as a product. Option A

In this equation, the reactants on the left-hand side consist of gases (C2H4 and H2), while the products on the right-hand side include a solid (Caco3) and a gas (CO2).

When a reaction involves a change from gaseous to solid or liquid states, there is typically a decrease in entropy because the particles become more ordered and constrained in the solid or liquid phase.

Conversely, when a reaction involves the formation of gases, there is generally an increase in entropy because gases have higher degrees of molecular motion and greater freedom of movement compared to solids or liquids.

In the given equation, the reactants include three gaseous compounds (C2H4, H2, and C2H6), and one of the products is a gas (CO2). Therefore, the overall entropy of the system increases during this reaction.

The equation Fe(s) + S(s) → FeS(s) does not show an increase in entropy. Both the reactants (Fe and S) and the product (FeS) are solids. Since solids have lower entropy compared to gases or liquids, the entropy of the system does not increase in this reaction. Option A

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Answer:

A

Explanation:

The sun is larger than the planets in our solar system and has far more mass and gravity than the planets.