How many moles are in 3.75 x 10^25 atoms of Tungsten?

The solution contains solute and solvents, have evenly distributed particles, are homogenous and can include solid, gas and liquid in them together.

The homogenous substance composed of a mixture of two or many substances in it is called a solution. The solute is the substance that can be liquid, solid or gas that gets dissolved in it.

The solvent is another substance in which the solute gets dissolved to produce a solution. The particles of the solute and the solvent are evenly dispersed in the solution.

Therefore, the solution is a homogenous mixture.

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Answer:

A. They contain solutes and solvents.

C. Their particles must be evenly distributed.

D. They are homogeneous matter.

Question 2:

Which statements are true of heterogeneous mixtures? Check all that apply.

They settle out.

They exhibit the Tyndall effect.

Their solutes and solvents appear as one.

They exhibit Brownian motion.

They are evenly distributed mixtures.

Answer:

A. They settle out.

B. They exhibit the Tyndall effect.

D.  They exhibit Brownian motion.

Explanation:

edge, have a lovely day <3

Answer:

952.2g SO3

Explanation:

Molar mass of C4H8S2 is 120.2363 g/mol

Mol in 750.0g = 750.0/120.2363 = 6.238 mol

1mol C4H8S2 produces 2 mol SO3

6.238 mol will produce 2×6.238 = 12.476 mol SO3

Molar mass SO3 = 32+3×16 = 80.0g/mol

Theoretical yield = 12.476×80.0 = 998.08g

The actual yield is 95.4%

Actual mass-produced = 95.4/100×998.08 = 952.2g SO3 produced

Hope it will help you.

Explanation:

Without even doing any calculations I would say that the 20 g HNO3 is limiting

But let us check if my opinion is correct

Balanced equation:

CaO(s) + 2HNO3 (aq) → Ca(NO3)2 (aq) + H2O(l)

1 mol CaO reacts with 2 mol HNO3

Molar mass CaO = 56 g/mol

Mol CaO in 615 g = 615 g / 56 g/mol = 10.98 mol

This will react with 10.98 * 2 = 21.96 mol HNO3

Molar mass HNO3 = 63 g/mol

Mol HNO3 in 20 g = 20 g / 63 g/mol = 0.317 mol

Clearly - my original idea correct - HNO3 is limiting .

The reaction stoichiometry can be used to determine the precise quantity of reactant that will be required to react with another element. The limiting agent is determined by the mole ratio rather than the mass of the reactants. Here the mass of calcium nitrate formed is 16.82 g.

Reagents that are entirely consumed by a chemical reaction are known as limiting reagents. They are additionally known as limiting reactants or limiting agents. A predetermined quantity of reactants are necessary for the reaction to be completed, according to the stoichiometry of chemical reactions.

The limiting reactant determines the maximum amount of product that can be formed from the reactants when reactants are not present in stoichiometric quantities.

Here the equation is:

CaO + 2HNO₃ → Ca (NO₃)₂ + H₂O

'n' of CaO = 15 / 56 = 0.267 mol

n of HNO₃ = 20 / 63 = 0.317 mol

1 mol of CaO 2 moles of HNO₃

0.267 mol = 0.267 × 2 = 0.534 mol

So HNO₃ is the limiting reactant.

0.267 mol CaO gives 0.267 mol Ca (NO₃)₂

Mass of HNO₃ = 0.267 × 63.01 = 16.82 g

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Answer:

force = 3000N

mass= 20 kg

now

F= ma

3000= 20×a

3000÷20=a

a=15

F= ma by newtons second law of motion

Answer:

1. determining the pOH of the solution from the given pH of 10.00 assuming the solution is at 25° C.

The percent yield of copper hydroxide is 84%

From the question, we are to determine the percent yield of copper hydroxide

First, we will determine the theoretical mass

From the given balanced chemical equation, we have

Cu(NO₃)₂ + 2NaOH -- Cu(OH)₂ + 2NaNO₃

This means,

1 mole of copper(II) nitrate reacts with 2 moles of sodium hydroxide to produce 1 mole of copper hydroxide

Therefore,
0.05 mole of copper(II) nitrate reacts with 0.1 mole of sodium hydroxide to produce 0.05 mole of copper hydroxide

The theoretical number of moles of copper hydroxide that is produced is 0.05 mole

Now, for the theoretical mass

Using the formula,

Mass = Number of moles × Molar mass

Molar mass of copper hydroxide = 97.56 g/mol

Then,

Theoretical mass = 0.05 × 97.56

Theoretical mass of copper of hydroxide produced is = 4.878 g

Now, for the percent yield of copper hydroxide

Percent yield is given by the formula,

[tex]Percent\ yield = \frac{Actual\ yield}{Theoretical\ yield} \times 100\%[/tex]

Then,

[tex]Percent\ yield\ of\ copper\ hydroxide= \frac{4.1}{4.878}\times 100\%[/tex]

[tex]Percent\ yield\ of\ copper\ hydroxide= 84\%[/tex]

Hence, the percent yield of copper hydroxide is 84%.

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Answer:

I thinks it Br hope this helps

Answer:

adenine, cytosine, uracil, and guanine.

Answer:

For DNA there is Adenine (A), Thymine (T), Guanine (G), and Cytosine (C)
For RNA there is Adenine (A), Uracil (U), Guanine (G), and Cytosine (C)

Explanation:

Answer:

pharmaceuticals

Explanation:

pharmaceuticals

The answers to this quick check are as follows:

1.B- one made of a different metal that will not rust

2.B- It is made of polymers that are very flexible.

3.D- the ability to reflect electromagnetic waves

4.B-The atoms can slide past each other while still remaining attracted to each other electrically.

5.B-pharmaceuticals

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Answer:

7.C or D not sure

Explanation:

its just a opinion :3

Answer:

The four substances recycled during photosynthesis and respiration are carbon dioxide, water, oxygen, and glucose.

So because you don't have all these choices, just pick, carbon, hydrogen, and oxygen, which is the last answer.

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~[tex]MiniMeteorologist\\[/tex]~

Answer:

carbon hydrogen and oxygen

Explanation:

Answer:

HF <==> H+ + F-

Ka = 6.8x10-4 = [H+][F-] / [HF]

6.8x10-4 = (x)(x) / 0.25 - x (assume x is small relative to 0.25 and ignore it to avoid using quadratic)

6.8x10-4 = x2 / 0.25

x2 = 1.7x10-4

x = 1.3x10-2 M (this is ~ 5.2% of 0.25 so our assumption above was not valid. We must use quadratic)

6.8x10-4 = x2 /0.25 - x

1.7x10-4 - 6.8x10-4 x = x2

Use quadratic to find x = 0.0127 M = [H+]

pH = -log H+ = -log 0.0127

pH = 1.90 so answer is probably 1.88(B)

Explanation:

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The electrophilic bromination or chlorination of benzene requires Lewis acid along with the halogen.

The bromination or chlorination of benzene is an example of an electrophilic aromatic substitution reaction.

During the reaction, the bromine forms a sigma bond to the benzene ring, yielding an intermediate. Subsequently a  a proton is removed from the intermediate to form a substituted benzene ring.

This reaction is achieved with the help of Lewis acid as catalysts.

Thus, the electrophilic bromination or chlorination of benzene requires Lewis acid along with the halogen.

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The property makes the materials used in fiber optic cables is:

C. High density

They transfer data signals in the form of light and travel hundreds of miles significantly faster than those used in traditional electrical cables. Fiber is immune to electrical interference. There is no cross - talk between signals in different cables and no pickup of environmental noise. Information traveling inside the optical fiber is even immune to electromagnetic pulses generated by nuclear devices.

Thus, correct option is C.

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Answer:Because the amount of water vapor in the air increases

Explanation:In humid climates, thunderstorms often cause heavier rain than general wintertime rainfall since moisture content in the air typically is higher in the spring and summer, and since air usually rises at a much more rapid rate within developing thunderstorms than in general winter systems.During very heavy rainfall, where all of the water in the atmosphere is often rained out, the water vapour content governs the amount of rainfall. The higher the humidity the greater the water vapour, and the more rain we're likely to see. HOPE THIS HELPS ^w^

Answer:

The chemical equation needs to be balanced so that it follows the law of conservation of mass. A balanced chemical equation occurs when the number of the different atoms of elements in the reactants side is equal to that of the products side.

Explanation:

How do you balance equations?

In general, however, you should follow these steps:

1. Count each type of atom in reactants and products.

2. Place coefficients, as needed, in front of the symbols or formulas to increase the number of atoms or molecules of the substances.

3. Repeat steps 1 and 2 until the equation is balanced.

Explanation:

[tex]ke = \frac{1}{2} \times m \times {v}^{2 } \\ m = \frac{2 \times ke}{ {v}^{2} } \\ m = \frac{2 \times 70.0}{ {8}^{2} } \\ m = \frac{140}{64} = 2.1875[/tex]

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Answer:

check the Ac so ya so ya so ya so ya so ya so ya

Answer:

Butter stored in a refrigerator is a solid. Sara should put a thermometer in the refrigerator for an hour and record this temperature.

Answer:

Different types of silk do not have the same strength if they come from different sources.

Explanation:

Different Spiders will gave different webs. I hope this helps <3

Answer:

Different silk strands have different combinations of amino acids.

The surfactant does not dissolve in hexane due to its polar nature.

The surfactant used in this experiment does not dissolve in hexane because hexane is non-polar solvent whereas the surfactant is polar in nature and we know that polar solutes only dissolve in polar solvent so we can conclude that the surfactant does not dissolve in hexane due to its polar nature.

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The ideal gas equation gives the relation of the pressure and the volume of the gas with that of the moles and the temperature. Moles of oxygen in the lung are 0.026 moles.

The ideal gas equation states that moles of the substances are directly proportional to the pressure and volume but inversely to the temperature of the hypothetical gas.

The ideal gas equation can be given as,

[tex]\rm PV = nRT[/tex]

Where,

Volume or the lung capacity (V) = 3.0 L

Pressure of the lungs (P) = 0.208 atm  

Gas constant (R) = 0.082057

Temperature of the air (T) = 295 K

Substituting values in the equation:

[tex]\begin{aligned}\rm n &= \rm \dfrac{PV}{RT}\\\\&= \dfrac{0.208 \times 3.0}{0.082057\times 295}\\\\&= 0.026 \;\rm moles\end{aligned}[/tex]

Therefore, the number of the moles of the oxygen in lungs are 0.026 moles.

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Explanation:

Mass of xenon tetrafluoride = 4.658 g

To determine the number of grams of xenon in 4.658 grams of the compound xenon tetrafluoride:

The chemical formula for xenon tetrafluoride is XeF_4XeF

4

Molar mass of XeF_4XeF

4

= 207.28 g/mol

Molar mass of xenon = 131.29 g/mol

First of all, we would calculate the number of moles of XeF_4XeF

4

.

\begin{gathered}Number\;of\;moles = \frac{mass}{molar\;mass}\\\\Number\;of\;moles = \frac{4.658}{207.28}\end{gathered}

Answer:

Acid rain is a stronger acid.

General Formulas and Concepts:
Acids/Bases

Explanation:

We are given that acid rain has a pH = 4.

We know that the lower the pH number, the more acidic it becomes. The higher the pH number, the more basic is becomes.

Therefore, the lower the pH scale number, the stronger the acid. Typically, the pH scale generally ranges from pH 1 to pH 14.

Comparing pH of 4 in the scale from 1 - 14, it would be a strong acid.

Topic: AP Chemistry

Unit: Acids/Bases

Answer:

16

Explanation:

2 per molecule X 8 molecules in total

Answer:

1) Since they are both negatively charged they start to push each other away to go pair with positively charged ions. 2) These oppositely charged ions attract each other to form ionic networks (or lattices). Electrostatics explains why this happens: opposite charges attract and like charges repel. When many ions attract each other, they form large, ordered, crystal lattices in which each ion is surrounded by ions of the opposite charge. 3) Metals form positive ions (cations). A magnesium atom must lose two electrons to have the same number of electrons as an atom of the previous noble gas, neon. Thus, a magnesium atom will form a cation with two fewer electrons than protons and a charge of 2+. 4) Nonmetals form negative ions (anions). A nitrogen atom must gain three electrons to have the same number of electrons as an atom of the following noble gas, neon. Thus, a nitrogen atom will form an anion with three more electrons than protons and a charge of 3−.

Explanation:

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Different Fossil organisms succeed one another to go up through the different rock layers in a definite and determinable order. Therefore, any time period can be recognized by its fossil content

Explanation:

Different Fossil organisms succeed one another to go up through the different rock layers in a definite and determinable order. Therefore, any time period can be recognized by its fossil content