a mass of 4.1 grams of hydrogen is allowed to react completely with excess oxygen. however, the percent yield for this reaction is calculated to be only 90%, possibly due to an unknown experimental error. how many grams of water were actually formed in this reaction? (please give your answer to 1 decimal place.) h2 o2 --> h2o

a) The Lennard-Jones potential predicts the separation r_eq at the minimum energy U_min.

b) The U_min for this interaction at T=298 K is the value obtained from the Lennard-Jones potential equation when r=r_eq.

c) The ratio of U_min to the purely attractive van der Waals component of the interaction potential at r_eq can be calculated by comparing the attractive part (-A/r^6) to the total potential energy U_min.

d) The ratio of r_eq to r_0, where u(r_0)=0.4, can be determined by finding the value of r_eq where the potential energy is equal to 0.4 times the total potential energy at r=r_0.

e) The ratio of r_s to r_0, where r_s is the separation where the magnitude of the attractive adhesion force is maximum, can be determined by finding the value of r where the derivative of the potential energy with respect to r is equal to zero.

f) The value of F_max between the two atoms can be obtained by taking the negative derivative of the potential energy equation with respect to r and evaluating it at r=r_s.

a) The Lennard-Jones potential provides information about the relationship between energy and separation between two interacting atoms.

At the minimum energy (U_min), the potential predicts the separation r_eq, which corresponds to the equilibrium distance between the atoms. This is the distance at which the energy of the system is at its lowest point.

b) To determine the value of U_min at a given temperature (T=298 K), you can substitute the equilibrium separation r_eq into the Lennard-Jones potential equation and calculate the resulting energy value.

This will give you the U_min for the interaction.

c) The Lennard-Jones potential consists of two components: an attractive component (-A/r^6) and a repulsive component (B/r^12).

The ratio of U_min to the purely attractive van der Waals component of the interaction potential at r_eq can be calculated by comparing the magnitude of the attractive component to the total potential energy at the equilibrium separation.

This ratio provides insights into the relative contribution of the attractive force to the overall potential energy at equilibrium.

d) The ratio of r_eq to r_0 can be determined by finding the value of r_eq where the potential energy is equal to 0.4 times the total potential energy at r=r_0.

In other words, you need to solve the Lennard-Jones potential equation for r_eq when the potential energy is equal to 0.4 times the potential energy at r=r_0.

e) The ratio of r_s to r_0 is obtained by finding the value of r where the magnitude of the attractive adhesion force is maximum.

This can be determined by finding the separation r where the derivative of the potential energy equation with respect to r is equal to zero.

The value of r_s represents the separation at which the attractive force between the atoms is strongest.

f) The value of F_max between the two atoms can be obtained by taking the negative derivative of the Lennard-Jones potential energy equation with respect to r and evaluating it at r=r_s.

This will give you the magnitude of the maximum attractive adhesion force between the atoms.

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Answer:

2.58×10^6

Explanation:

1.20×2.152

=2.5824×10^6

Answer:

Answer:

dfgdhfjkl;jhgfdsAZXcvdfcgbwegbfgvdavsbhgsvadrfgvrdt

Explanation:

In a saturated solution of silver chromate (Ag2CrO4), the silver ion concentration is already given as 8.66 x 10^-5 M. We have to determine the concentration of silver ions in the solution when solid sodium chromate (Na2CrO4) is added.

When solid sodium chromate is added, it dissociates into sodium ions (Na+) and chromate ions (CrO4^2-). Since silver chromate is a sparingly soluble salt, it establishes an equilibrium between the dissolved ions and the solid salt.

The balanced chemical equation for the dissolution of silver chromate can be represented as:

Ag2CrO4 ⇌ 2 Ag+ + CrO4^2-

The addition of solid sodium chromate does not directly affect the concentration of silver ions (Ag+). However, it increases the concentration of chromate ions (CrO4^2-) in the solution. Given that the concentration of chromate ions (CrO4^2-) is 0.0600 M, and assuming that the dissociation of silver chromate is complete, the concentration of silver ions remains the same at 8.66 x 10^-5 M.

Therefore, the concentration of silver ions in a saturated silver chromate solution, when solid sodium chromate is added to form an additional 0.0600 M chromate ion, would still be 8.66 x 10^-5 M. The addition of sodium chromate increases the concentration of chromate ions but does not affect the concentration of silver ions.

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Answer:

Protons have a positive charge.

Neutrons have no charge.

Electrons have a negative charge.

Explanation:

I hope this helps :)

Answer:

The one you currently picked. The last one i think

Explanation:

'The slower moving' type of water molecules have the greater tendency to condense to the liquid state from the gaseous state.

If the molecules speed up it means that energy has been added to the system. Eventually, therefore, the water would evaporate into steam (or water vapour) provided the energy was continued to be added to the system.

Vice versa if the molecules are slowed down then the water molecules in gas would condense and change their state from gas to liquid.

Condensation is the process where water vapour becomes liquid. It is the reverse of evaporation, where liquid water becomes a vapour.

Condensation happens one of two ways: Either the air is cooled to its dew point or it becomes so saturated with water vapour that it cannot hold any more water.

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10.63 grams of ZnO remain after the reaction is complete.

The balanced chemical equation for the reaction between zinc oxide and water is:

ZnO(s) + H2O(l) → Zn(OH)2(aq)

No. of moles of ZnO = Mass of ZnO / Molar mass of ZnO= 35.0 g / 65.38 g/mol= 0.535 moles of ZnO

The amount of water is given as 6.85 g

The molar mass of water is:H2O = 18.02 g/mol

No. of moles of H2O = Mass of H2O / Molar mass of H2O= 6.85 g / 18.02 g/mol= 0.380 moles of H2O

Now, we need to find out the limiting reagent.

.No. of moles of Zn(OH)2 formed from 0.535 moles of ZnO = 0.535 molesNo. of moles of Zn(OH)2 formed from 0.380 moles of H2O = 0.380 moles

Therefore, since the amount of ZnO (0.535 moles) is greater than the amount of H2O (0.380 moles), H2O is the limiting reagent and ZnO is the excess reagent.

The maximum amount of Zn(OH)2 that can be formed is given by the amount of ZnO that reacts with H2O, which is 0.380 moles.

No. of grams of Zn(OH)2 = No. of moles of Zn(OH)2 × Molar mass of Zn(OH)2= 0.380 mol × (97.41 g/mol)= 37.08 gThe formula for the limiting reagent is H2O. The amount of excess reagent remaining after the reaction is complete can be calculated by subtracting the amount of limiting reagent used from the initial amount of excess reagent

.Initial amount of excess reagent (ZnO) = 35.0 g

No. of moles of ZnO = Mass of ZnO / Molar mass of ZnO= 35.0 g / 65.38 g/mol= 0.535 moles of ZnO

Amount of ZnO used in the reaction = No. of moles of Zn(OH)2 formed × Ratio of ZnO to Zn(OH)2= 0.380 mol × (1 mol ZnO / 1 mol Zn(OH)2)= 0.380 moles of ZnO used

Amount of ZnO remaining after the reaction = Initial amount of ZnO − Amount of ZnO used= 35.0 g − (0.380 mol × 65.38 g/mol)= 10.63 g

Therefore, 10.63 grams of ZnO remain after the reaction is complete.

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Answer: B 1:2

Explanation:

i legit searched it up and the answer poped up lol

Answer:

The ratio is 2:1 option C

Hope it helps..........

There are some important equations that we must know:

\(PV=nRT\)

\(n=\dfrac{m}{M}\)

We're given:

First, solve for n:

\(n=\dfrac{m}{M}\)

\(n=\dfrac{128}{32.00}\\\\n=4\)

Now, solve using the Ideal Gas Law:

\(PV=nRT\)

⇒ Isolate V:

\(V=\dfrac{nRT}{P}\)

⇒ Plug in given values:

\(V=\dfrac{4*8.31*273}{101.3}\\\\V =89.6\)

a. 89.6 L

Answer:

I'm assuming you're talking about something like a regular housekey, in which case there are numerous things you can describe!

Its mass: how much it weighs, times the gravity of the system.

Its color: is it silver-colored, or gold, etc.?

Its volume: you could probably calculate this, though it would be hard because it's not a traditional shape, I assume.

Its density: this is mass/volume. It means how many of the atoms are in a given space; how tightly packed the atoms are.

Its tendency to rust / its specific combination of metals or alloys: is it made of copper, tin, steel.. and these are all things that can rust to varying degrees.

The arrow of retrosynthesis. Indicates that the species on the left is a descendant of the species on the right.

Arrow of bond dipole. The arrow head is pointing to the more electronegative atom (the - atom), while the crossed end is above the more electropositive atom (the + atom).

This is a retrosynthetic arrow, which means that the species before the arrow (which is typically more complicated) is synthesized from the species after the arrow (normally less complicated).

One or more steps can be used to create the target molecule.

We use this type of arrow to plan forward syntheses of more complex molecules by strategically detaching the more complex molecule.

Example showing Retrosynthetic approach:

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Answer:

Electrons

Explanation:

Cathode rays carry electronic currents through the tube. Electrons were first discovered as the constituents of cathode rays. J.J. Thomson used the cathode ray tube to determine that atoms had small negatively charged particles inside of them, which he called “electrons.”

The rays produced in a cathode tube are electrons which are present in the shells surrounding the nucleus of an atom.

An atom is defined as the smallest unit of matter which forms an element. Every form of matter whether solid,liquid , gas consists of atoms . Each atom has a nucleus which is composed of protons and neutrons and shells in which the electrons revolve.

The protons are positively charged and neutrons are neutral and hence the nucleus is positively charged. The electrons which revolve around the nucleus are negatively charged and hence the atom as a whole is neutral and stable due to presence of oppositely charged particles.

Atoms of the same element are similar as they have number of sub- atomic particles which on combination do not alter the chemical properties of the substances.

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Silver (Ag) will weigh more than silicon (Si) that contains the same number of atoms as the latter. According to the given statement, we have a sample of Si that weighs 64.6 grams. Silicon and silver have different molar masses, which means that the same number of atoms of the two substances will weigh differently.

It can be proved using Avogadro's number. According to Avogadro's law, one mole of any substance contains Avogadro's number of particles (atoms or molecules) and the molar mass of any substance is equal to the mass of one mole of the substance. The molar mass of silicon (Si) is 28.08 g/mol and the molar mass of silver (Ag) is 107.87 g/mol.Therefore,1 mole of Si weighs 28.08 g and contains 6.022 × 1023 atoms of Si, and1 mole of Ag weighs 107.87 g and contains 6.022 × 1023 atoms of Ag.Therefore, if a sample of Si weighs 64.6 g, we can calculate how many moles of Si are present in that sample. We can use the formula:n = m/Mwhere,n = number of moles of the substancem = mass of the substanceM = molar mass of the substanceSo, number of moles of Si present in the sample of Si = 64.6 g / 28.08 g/mol= 2.3 molThe sample of Ag containing the same number of atoms as Si will weigh the same as one mole of Ag. So, the weight of the sample of Ag can be calculated as follows:

Weight of Ag sample = number of moles of Ag × molar mass of Ag= 2.3 mol × 107.87 g/mol≈ 248.7 gThe weight of the sample of Ag that contains the same number of atoms as Si is 248.7 g, which is more than 64.6 g.

Therefore, a sample of Ag that contains the same number of atoms as Si will weigh more than 64.6 g.

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Answer:

\( \huge{ \boxed{1.213 \: \text{moles}}}\)

Explanation:

To find the number of moles in a substance given it's number of entities we use the formula

\( \bold{n = \frac{N}{L}} \\ \)

where

From the question

N = 7.30 × 10²³ NaCl molecules

\(n = \frac{7.30 \times {10}^{23} }{6.02 \times {10}^{23} } = \frac{7.30}{6.02} \\ = 1.2126\)

We have the final answer as

Television technology has evolved from the process of analogue to the process of digital signal transmission.

We know that technology has to do with the correct application of the scientific knowledge so as to solve practical problems. The chemical engineer is ultimately involved in the process of problem solving the society.

The television technology has evolved from the analogue transmission of the signals when I was a child to the digital transmission of signals thus most of the television stations now do digital transmission.

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Answer:D.the train must be able to maintain a speed of 250km/h.

Explanation:

Answer:

Subtract the atomic number (the number of protons) from the rounded atomic weight. This gives you the number of neutrons in the most common isotope. Use the interactive periodic table at The Berkeley Laboratory Isotopes Project to find what other isotopes of that element exist.

Explanation:

Forms of the same atom that differ only in their number of neutrons are called isotopes. Together, the number of protons and the number of neutrons determine an element's mass number: mass number = protons + neutrons.

The pH of the solution is 1.52 and the concentration of C6H6O62- is 2.2 * 10^-7 M.

We know that;

H₂C6H6O6 ⇔HC6H6O6^-(aq)    +   H^+(aq) ----- (1)

Ka1 = 7.9 x 10^-5

Again;

HC6H6O6^-(aq) ⇔ C6H6O6^2-(aq)  +   H^+(aq) ------- (2)

Ka2 = 1.6 x 10^-12

Given that Ka2 <<<< Ka1 we have to apply equation 1 to obtain H^+ hence;

Ka1 = [HC6H6O6^-] [H^+]/[H₂C6H6O6]

Let  [HC6H6O6^-] = [H^+] =x

7.9 x 10^5 =x^2/0.1 - x

But x <<< 0.1 thus;

7.9 x 10^5 =x^2/0.1

x = √7.9 x 10^-5  * 0.1

x = 0.03 M

pH = -log(0.03 M)

pH = 1.52

To obtain  C6H6O6^2-;

Ka2 = [ C6H6O6^2-] [ H^+]/[HC6H6O6^-]

Also;

[ C6H6O6^2-] = [ H^+]= x

Now;

1.6 x 10^-12 = x^2/0.03 -x

But x<<<0.3

Hence;

1.6 x 10^-12 = x^2/0.03

x = √1.6 x 10^-12 * 0.03

x = 2.2 * 10^-7 M

The concentration of C6H6O6^2- is  2.2 * 10^-7 M.

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The simple awnser is that it dissolved.

Answer:

a soft, spongy material that may be changed into coal

Explanation:

Neutralization reactions are when an acid and base react, typically forming water and salt. These processes will help return pH levels to more neutral levels. Soil can sometimes become more acidic (under 5.5).

Answer:

the answer is O²- hopefully